Why Life Is Not Enactivism

Part of APS and Contemporary Explanatory Approaches

Where This Article Fits

This article is part of the APS programme of testing the framework against its strongest explanatory comparators. The comparison follows the protocol established in Comparative Explanatory Methodology in Theoretical Biology: the approaches are compared through their explanatory targets, organising principles, conceptual architectures, characteristic strengths, and explanatory scope before conclusions about their relationship are drawn. It does not ask whether APS and enactivism use the same concepts, or whether one framework should replace the other. It asks the more restricted question of what explanatory difference follows when APS and a strongest biologically grounded enactivist account are required to address the same biological target.

The article therefore applies the APS distinction between architectural difference and comparative explanatory gain. Its conclusion is deliberately bounded: APS and biologically grounded enactivism remain architecturally non-identical, but for the common target examined here neither has been shown to establish an explanatory dependency unavailable to the other. Questions concerning other enactivist targets, including the relation between life and cognition, remain open to separate target-matched investigation.

Introduction

APS and enactivism occupy substantially overlapping explanatory territory. Both take living organisation seriously. Both reject pictures of organisms as merely passive recipients of environmental causes. Both address agency, normativity, regulation, organism–environment relations, and the biological conditions under which features of the environment can matter to an organism. Important enactivist accounts additionally connect these concerns to sense-making, cognition, and continuity between life and mind.

These similarities do not make APS an enactivist framework. APS defines life as viability-oriented, constraint-closed organisation and biological agency as the viability-oriented activity through which living organisation sustains the conditions of its persistence. It distinguishes agency from Biological Evaluation, significance, and cognition, while treating Agency, Process, and Scale as analytic projections of one organised biological reality. Biologically grounded enactivism develops a different conceptual architecture around autonomy, precariousness, adaptivity, normativity, sense-making, and agency.

The existence of two architectures, however, raises a harder question than whether their concepts are identical. Different frameworks can partition the same biological problem differently without thereby explaining different things. Conversely, apparently similar terminology can conceal important differences in the dependencies each framework claims are required for an explanandum.

The relevant question is therefore not whether APS can be shown to be conceptually distinct from enactivism. It can. The question is what explanatory difference follows from that distinction when both approaches are required to address the same biological target.

This article performs that comparison. It first establishes a common explanatory target without building either APS or enactivist terminology into the question. It then reconstructs the strongest biologically grounded enactivist answer independently of APS. Only after that reconstruction is APS admitted to the comparison. The two accounts are then compared dependency by dependency, with differences in terminology or conceptual granularity excluded as evidence of explanatory gain unless they establish a corresponding difference in what must be explained or in the dependencies required to explain it.

The result is deliberately non-triumphal. APS and biologically grounded enactivism remain architecturally non-identical. Yet for the target examined here, their differences do not presently establish comparative explanatory gain for either framework. The case therefore illustrates a more general methodological point: architectural difference is not yet explanatory difference, and explanatory difference is not yet explanatory superiority.

Architectural Difference Is Not Yet Explanatory Difference

Comparison between general biological frameworks can easily become comparison between vocabularies. One framework speaks of autonomy where another speaks of organisation; one invokes adaptivity where another distinguishes evaluation and regulation; one describes sense-making where another distinguishes significance from cognition. Such contrasts can be philosophically important, but their explanatory significance cannot be inferred merely from the existence of different terms.

At least four questions must be distinguished.

First, are the concepts themselves different? Two frameworks may define their terms differently or divide the explanatory territory at different places.

Second, do those conceptual differences produce different explanatory architectures? A framework may treat two phenomena as distinct where another treats them as aspects of a single relation, or may place an explicit dependency between processes that another describes within a broader category.

Third, does the architectural difference establish a difference in explanatory dependency? That requires showing that one account identifies something as necessary for explaining the target that the other account omits, denies, or cannot represent without altering its explanation.

Fourth, does the dependency difference produce comparative explanatory gain? Even a genuine difference does not automatically favour the framework that contains the additional distinction. The additional dependency must improve explanation of the matched target rather than merely increase conceptual detail.

These questions establish a sequence of increasingly demanding claims:

conceptual difference → architectural difference → explanatory dependency difference → comparative explanatory gain

The arrows in this sequence are not automatic implications. Each transition requires independent justification.

This matters especially for APS. APS has developed an increasingly differentiated explanatory architecture in which life, biological agency, Biological Evaluation, significance, integration, cognition, organised persistence, function, normativity, and scale-sensitive organisation are not interchangeable. That differentiation can increase the precision with which biological questions are posed. It does not follow that APS explains a phenomenon better than another framework that partitions the same explanatory dependencies differently.

The same control applies to enactivism. A distinctive vocabulary of autonomy, adaptivity, precariousness, sense-making, and interactional asymmetry cannot establish explanatory superiority merely because it organises the biological problem differently.

A fair comparison must therefore begin with the explanandum rather than with either framework’s preferred conceptual vocabulary. It must reconstruct the strongest comparator on its own terms, identify the dependencies each approach actually requires, and allow equivalence, redescription, comparator advantage, framework deficiency, or unresolved difference as genuine outcomes.

The test applied here is accordingly stricter than conceptual comparison. It asks whether architectural non-identity survives as explanatory non-equivalence once both frameworks are constrained to the same target.

Establishing the Common Explanatory Target

The comparison concerns a problem that both APS and biologically grounded enactivism clearly address: how the organisation of a living system makes differences in its circumstances consequential for its own continuing activity.

To avoid prejudging the answer, the common target is stated without the characteristic terminology of either framework:

ECT-01 — What materially realised organisational dependencies enable a living system to regulate its activity in relation to changing internal and external conditions such that differences in those conditions matter to the continuation of its own organisation?

Several features of this formulation are deliberate.

The target asks about materially realised organisational dependencies. It therefore cannot be answered merely by assigning a descriptive property such as goal-directedness, normativity, autonomy, or agency to the organism. The explanatory task is to identify what must be organised and related such that the relevant regulation can occur.

The target also asks how differences in conditions come to matter to the continuation of the system’s own organisation. This excludes an account in which biological normativity is supplied entirely by an external observer, experimental criterion, engineering objective, or retrospective fitness judgement. At the same time, it does not specify in advance whether the relevant relation should be described as viability, autonomy, precariousness, adaptivity, evaluation, sense-making, or significance.

ECT-01 also deliberately avoids cognition. This is not because cognition is irrelevant to either framework. Some enactivist accounts explicitly connect sense-making with cognition and defend strong continuity between life and mind, while APS distinguishes biological agency and Biological Evaluation from cognition. Building cognition into the common target would therefore prejudge a substantive boundary question rather than provide neutral ground for comparison.

Nor does ECT-01 contain constraint closure, autopoiesis, autonomy, adaptivity, Biological Evaluation, or sense-making. These are candidate explanatory resources. They cannot also be assumptions built into the explanandum against which their explanatory contribution is to be assessed.

The unit of comparison is consequently not the isolated concept but the explanatory dependency. The question is not whether one framework possesses a term corresponding to a term in the other. It is whether each framework establishes the materially relevant relations required to explain ECT-01 and whether either establishes a dependency the other lacks.

This target-matching requirement also places an important limit on the conclusion. A result concerning ECT-01 is not automatically a result concerning enactivism as a whole, APS as a whole, perception, phenomenology, sensorimotor cognition, social cognition, or the relation between life and mind. Those questions require their own matched explanatory targets.

The Strongest Biologically Grounded Enactivist Answer

Enactivism is a family of approaches rather than a single theory. For ECT-01, the relevant comparator is therefore not an undifferentiated collection of everything described as enactive. The strongest comparator is the biologically grounded line of work concerned with autonomy, adaptivity, normativity, sense-making, and agency.

A minimum comparator nucleus is sufficient for this purpose. Di Paolo’s account of autopoiesis and adaptivity supplies the crucial distinction between autonomous organisation and adaptive regulation. Thompson develops the broader relation among autonomy, adaptivity, sense-making, and life–mind continuity. Barandiaran, Di Paolo, and Rohde sharpen the organisational requirements for agency in terms of individuality, normativity, and interactional asymmetry. Later sensorimotor work develops these resources further without requiring the whole sensorimotor programme to be imported into ECT-01.

The resulting comparator is substantially stronger than the claim that organisms actively interact with their environments.

Autonomous Individuality

The starting point is autonomous organisation. A living system is not treated merely as an aggregate whose boundaries and identity are supplied by an observer. Its organisation contributes to constituting and maintaining it as an individual.

The relevant processes stand in relations of mutual dependence. Their organisation establishes a system whose identity is generated and maintained through its own activity. Individuality therefore has an organisational basis rather than being simply an externally convenient demarcation.

This supplies the first dependency:

interdependent autonomous organisation → intrinsic individuality

For ECT-01, this matters because regulation must be regulation for a system whose continued organisation can itself be at stake.

Precarious Organisation

Autonomy is not mere structural persistence. The organisation is precarious. Its constituent processes depend upon conditions that are not guaranteed independently of the organisation that maintains them.

A living system therefore faces an ongoing problem of continuation. The processes through which it exists must themselves be maintained, regenerated, or otherwise sustained through the organisation they collectively constitute.

The dependency can be stated as:

autonomous individuality + material precariousness → continuing requirement for self-maintenance

Precariousness is important because it gives biological continuation material stakes. The system does not merely happen to persist; its continued existence depends upon ongoing organisation under conditions in which that organisation can deteriorate or cease.

Intrinsic Normativity

Autonomous precarious organisation establishes a distinction between conditions compatible with continuation and conditions tending towards loss of the organisation.

This supplies an intrinsic normative reference. The relevant distinction is not imposed solely by an observer deciding what the system ought to do. Continued autonomous organisation provides a system-relative basis for distinguishing favourable and unfavourable conditions.

The dependency is:

autonomous precarious identity → intrinsic continuation/disintegration norm

This does not require conscious judgement or representation. Normativity at this point concerns the consequences of conditions and activity for the continuation of the organisation itself.

Why Autonomy Is Not Enough

A crucial strength of the biologically grounded enactivist comparator is that it does not simply infer adaptive regulation from autonomous organisation.

Di Paolo’s treatment of adaptivity makes explicit that autopoiesis or autonomous self-maintenance alone does not yet explain the organism’s capacity to regulate its activity in relation to graded tendencies in its conditions. A system could possess an organisational distinction between continuation and disintegration without thereby possessing the capacity to discriminate and respond to trajectories towards improving or deteriorating circumstances.

The comparator therefore contains an explicit insufficiency relation:

autonomous organisation alone ⇏ graded adaptive regulation

This is an important explanatory constraint. The existence of an intrinsic norm does not by itself explain how the organism becomes sensitive to changes bearing upon that norm or modifies its activity accordingly.

Adaptivity and Viability-Sensitive Regulation

Adaptivity supplies the further capacity. It concerns the system’s ability to regulate its activity in relation to tendencies affecting the conditions under which its autonomous organisation can continue.

The distinction is not merely between being alive and being dead. Conditions can vary while the system remains viable, and trajectories can move towards or away from states compatible with continued organisation. Adaptive regulation therefore requires sensitivity to such differences before the ultimate boundary of disintegration is reached.

The dependency is approximately:

intrinsic organisational norm + sensitivity to viability tendencies → adaptive discrimination and regulation

This gives the comparator an answer to a central part of ECT-01. Differences in conditions matter because they bear upon the continuation of autonomous organisation, and adaptivity enables the system to regulate activity in relation to those differences.

Regulation of Organism–Environment Coupling

Adaptive sensitivity must also affect what the system does. A system that is merely altered by its surroundings is not thereby adaptively regulating its relation with them.

The enactivist agency literature therefore places importance on the system’s own contribution to the interaction. Barandiaran, Di Paolo, and Rohde describe interactional asymmetry as one of the requirements for genuine agency. The agent is not merely a locus through which environmental causes pass; its organisation contributes to modulating its coupling with the environment.

The resulting dependency is:

viability-sensitive discrimination → endogenous modulation of organism–environment coupling → altered conditions for continued autonomous organisation

This does not imply independence from the environment. The relation is precisely one of coupling. The point is that the organisation of the system contributes to determining how that coupling proceeds.

Organism-Relative Significance and Sense-Making

Once encounters are differentially related to the system’s own organisational norm and the system regulates its coupling accordingly, environmental differences acquire organism-relative significance.

They are not significant because an external observer happens to regard them as useful or harmful. Their significance derives from their relation to the autonomous organisation and its capacity for adaptive regulation.

This provides the enactivist route towards sense-making:

autonomous norm + adaptive discrimination + regulated coupling → organism-relative significance / sense-making

Different enactivist formulations place somewhat different theoretical weight on sense-making, and stronger life–mind accounts connect it directly with cognition. Those stronger claims are not required for ECT-01. What matters here is the more limited dependency: features of the organism’s circumstances can become differentially significant through their relation to its autonomous and adaptive organisation.

Agency

The comparator’s account of agency adds a further constraint. Barandiaran, Di Paolo, and Rohde identify three requirements: individuality, normativity, and interactional asymmetry.

The agent must be sufficiently self-individuating for its activity to be attributable to an organised system rather than an arbitrary collection of processes. Its activity must be regulated relative to norms grounded in its organisation. And the system must contribute asymmetrically to the organisation of its interaction rather than merely undergoing environmental change.

The resulting relation can be summarised as:

autonomous individuality + endogenous normativity + adaptive interactional asymmetry → agency

This formulation should not be converted into the stronger claim that all agency must be biological. The organisational account permits the question of agency to be considered beyond living systems if the relevant requirements can be met. For ECT-01, however, living systems provide the relevant case.

Taken together, the comparator architecture is therefore:

autonomous organisation → individuality → precariousness → intrinsic normativity

while:

autonomous organisation alone ⇏ graded adaptive regulation

and:

intrinsic normativity + adaptivity → viability-sensitive discrimination → endogenous regulation of organism–environment coupling → organism-relative significance / sense-making

with:

individuality + normativity + interactional asymmetry → agency

This is a substantial answer to ECT-01. Any comparison that represented enactivism merely as a theory of embodied interaction or as an assertion that organisms make sense of their environments would fail to test APS against its strongest relevant comparator.

The APS Answer to the Same Target

APS approaches ECT-01 through a different explanatory partition.

It defines life as viability-oriented, constraint-closed organisation. This definition identifies neither a static structure nor an abstract capacity for self-maintenance. Living organisation persists through ongoing processes whose organisation contributes to sustaining the conditions under which those processes can continue.

Biological agency is the viability-oriented activity through which living organisation sustains the conditions of its persistence. Agency is therefore not an additional entity located above or inside the organism. Nor is Agency ontologically prior to Process or Scale. Agency, Process, and Scale are analytic projections of one organised biological reality.

For ECT-01, the important point is that APS does not move directly from the existence of living organisation to the conclusion that every relevant environmental difference has already been discriminated or adaptively regulated. The architecture distinguishes the organisation whose persistence is at issue from the activity through which persistence is maintained and from the processes through which differences become significant for that activity.

Viability and Organised Persistence

Viability specifies the conditions within which living organisation can continue. It is not merely survival as a retrospectively observed outcome. The organisation must continually maintain or re-establish conditions compatible with its continued functioning under internal and external change.

APS describes this continuity through change as organised persistence. Persistence does not require material or structural invariance. Components can turn over, processes can alter, and relations with the environment can change while continuity of organisation is maintained or re-established.

ECT-01 therefore begins, in APS terms, from an organisation for which different conditions can have different consequences for continued functioning.

Biological Agency

Biological agency concerns the activity through which this organisation sustains the conditions of its persistence.

The relevant relation is not:

living organisation → guaranteed appropriate response

but rather:

viability-oriented organisation → viability-oriented activity under changing conditions

The activity can include maintaining existing conditions, compensating for perturbation, reorganising processes, altering exchanges, or otherwise contributing to the continuation of the organisation.

Agency in this sense does not require cognition, representation, intention, or consciousness. It identifies the viability-oriented character of organised biological activity.

Biological Evaluation

APS nevertheless requires more than the assertion that activity is viability-oriented. Environmental and internal differences must become differentially consequential for the organisation.

Biological Evaluation identifies the process through which biological agency generates significance. Differences in conditions are evaluated relative to their consequences for the viability of the organisation. Evaluation in this sense does not require reflective judgement. It concerns the materially realised discrimination through which differences can alter viability-oriented activity.

This introduces an intermediate dependency:

viability-oriented agency → Biological Evaluation → differential biological significance

The distinction matters for ECT-01 because the mere existence of viable organisation does not explain why a particular difference should modify activity in one way rather than another. Evaluation concerns the processes through which differences become consequential relative to continued organisation.

Significance

Significance is relational. A condition, difference, resource, constraint, perturbation, or opportunity can matter biologically because of its relation to the viability of an organised living system.

Significance is therefore neither an intrinsic property of an environmental object nor merely an observer’s description. It arises through the relation between biological organisation, conditions, evaluation, and viability-oriented activity.

The relevant architecture is:

Agency → Evaluation → Significance

and significance can in turn modulate subsequent activity.

This architecture does not require that every biologically significant difference be cognitively represented or consciously experienced. Nor does significance by itself amount to meaning in a stronger psychological or semantic sense.

Regulation Without Presupposing Cognition

APS deliberately distinguishes biological agency and Biological Evaluation from cognition.

That distinction is relevant here primarily as a boundary control. ECT-01 asks how a living system regulates activity in relation to differences bearing upon continued organisation. APS does not require cognition in order for that relation to exist.

Cognition enters only under a further condition: biological agency becomes cognitive when integrated biological significance modulates activity across a temporal field of viability-relevant possibilities in ways not exhausted by immediate or fixed regulation.

Nothing in ECT-01 requires that additional condition. Introducing it into the common target would therefore bias the comparison towards a dispute about the boundary of cognition rather than the organisation of viability-sensitive regulation.

The APS answer required here can consequently be represented more narrowly:

viability-oriented, constraint-closed organisation → biological agency → Biological Evaluation → significance → modulation of activity relative to conditions bearing upon organised persistence

This is not the same conceptual decomposition as the enactivist route through autonomy, precariousness, adaptivity, sense-making, and interactional asymmetry.

But that observation is only the beginning of the comparison.

APS’s finer separation of agency, evaluation, significance, integration, and cognition cannot count as explanatory gain merely because more distinctions are explicitly represented. Likewise, the enactivist distinction between autonomy and adaptivity cannot count as explanatory gain merely because it makes an insufficiency relation especially explicit.

The relevant question remains whether either architecture establishes an explanatory dependency required by ECT-01 that the other does not.

That dependency-by-dependency comparison is the subject of the next section.

Dependency-by-Dependency Comparison

The two architectures can now be compared without treating conceptual correspondence as explanatory equivalence or conceptual difference as explanatory gain. The relevant question is whether APS covers each dependency established independently in the enactivist reconstruction and, where coverage is incomplete, whether the difference survives as a substantive residual.

The comparison produces six cases of full coverage and two cases of partial coverage.

Enactivist dependency	APS coverage	Comparative result
ENA-01 — Autonomous self-individuation	FULL COVERAGE	APS provides organised biological individuality; no residual established.
ENA-02 — Precarious organisation	FULL COVERAGE	Viability entails organisation whose continued functioning requires maintenance or re-establishment; no residual established.
ENA-03 — Intrinsic organisational norm	FULL COVERAGE	APS grounds normativity endogenously in viability-relative asymmetry; no residual established.
ENA-04 — Autonomy insufficient for graded adaptive regulation	PARTIAL COVERAGE	APS does not formulate the autonomy–adaptivity insufficiency relation in the same explicit terms; residual candidate requiring separate testing.
ENA-05 — Viability-tendency discrimination	FULL COVERAGE	Biological Evaluation and viability-relative asymmetry provide differential sensitivity to conditions bearing on persistence; no residual established.
ENA-06 — Endogenous regulation of organism–environment coupling	FULL COVERAGE	Viability-oriented agency includes regulation of organism–environment relations through activity contributing to continued organisation; no residual established.
ENA-07 — Organism-relative significance / sense-making	FULL COVERAGE	Agency → Biological Evaluation → Significance establishes organism-relative biological significance; no residual established.
ENA-08 — Individuality + normativity + interactional asymmetry → agency	PARTIAL COVERAGE	APS covers individuality and normativity but does not independently require interactional asymmetry in its definition of biological agency.

The table requires careful interpretation.

FULL COVERAGE does not mean that the two frameworks use the same concepts or derive their accounts in exactly the same way. It means that, for the dependency under examination, APS contains explanatory resources sufficient to represent the dependency required by ECT-01. It therefore provides no immediate basis for claiming enactivist explanatory gain.

Conversely, PARTIAL COVERAGE does not establish enactivist explanatory gain. It identifies a difference requiring further discrimination. A partially covered dependency may prove to perform explanatory work absent from APS, or it may prove to be differently expressed, differently partitioned, unnecessary for the matched target, or already supplied through another relation within the APS architecture.

ENA-08 illustrates the latter problem. The enactivist agency account makes interactional asymmetry an explicit requirement for agency. APS does not independently place that requirement in its definition of biological agency. But ECT-01 already asks about a living system regulating its own activity in relation to changing internal and external conditions. APS’s viability-oriented agency therefore supplies an endogenous contribution to the relevant interaction without requiring interactional asymmetry as an independently specified condition of agency. The architectural difference is real, but no additional ECT-01 dependency follows merely from the different placement of that requirement.

ENA-04 presents the stronger case. Enactivism explicitly denies that autonomous organisation alone is sufficient for the graded regulation associated with adaptivity. APS distinguishes viability-oriented organisation, agency, Biological Evaluation, and significance, but it does not formulate this distinction through an explicit autonomy–adaptivity insufficiency relation. ENA-04 therefore provides the strongest candidate for a genuine explanatory difference.

It must be tested rather than inferred.

The Strongest Residual: Autonomy and Adaptivity

The strongest case for an enactivist advantage begins with a simple but consequential distinction.

An autonomously organised system can possess an intrinsic norm because its own continued organisation establishes a distinction between conditions compatible and incompatible with its persistence. But the existence of that norm does not itself explain how the system discriminates graded changes in its circumstances or regulates activity in relation to tendencies towards improving or deteriorating conditions.

This is the work performed by adaptivity.

The enactivist account therefore makes explicit a dependency that cannot be collapsed into autonomy:

autonomous organisation alone ⇏ adaptive regulation

and:

autonomous organisation + adaptivity → viability-sensitive discrimination and regulation

This is more than a terminological distinction. It blocks an invalid inference from self-maintaining organisation directly to appropriately regulated activity. An organism can possess a norm of continued organisation without that fact alone explaining the processes through which changing conditions are detected, discriminated, and acted upon.

If APS moved directly from constraint-closed organisation to appropriate viability-oriented response, the enactivist distinction would expose a genuine explanatory omission. APS would identify the norm relative to which activity succeeds or fails without supplying the intermediate dependency through which differences in conditions alter regulation.

APS does not, however, require that inference.

Its definition of life identifies the viability-oriented, constraint-closed organisation whose persistence is at stake. Biological agency concerns the activity through which that organisation sustains conditions of persistence. Biological Evaluation concerns the process through which differences become differentially consequential relative to viability. Significance is generated through that evaluative relation and can modulate subsequent activity.

The relevant APS sequence is therefore not:

organisation → appropriate regulation

but:

viability-oriented organisation → agency → Biological Evaluation → significance → modulated activity

This supplies the explanatory separation that the autonomy–adaptivity distinction demands, although it partitions that separation differently.

The comparison consequently turns on whether the enactivist concept of adaptivity establishes an additional dependency beyond the APS evaluative-regulatory architecture.

For ECT-01, no such additional dependency has been established.

Both accounts require an organised system whose continuation is materially at stake. Both ground biological normativity in the relation between the system’s own organisation and conditions bearing upon its continuation. Both reject the inference that merely being acted upon by environmental conditions constitutes adaptive regulation. Both require differential sensitivity to conditions bearing upon continuation. Both require that this sensitivity alter the system’s activity or coupling with its surroundings.

The conceptual decompositions remain different. Enactivism places particular explanatory weight on the distinction between autonomy and adaptivity. APS places the corresponding discriminatory work within the relations among agency, Biological Evaluation, significance, and viability-oriented regulation.

But the difference does not survive, for ECT-01, as a demonstrated difference in explanatory dependency.

ENA-04 therefore does not establish enactivist explanatory gain over APS.

The converse conclusion is equally important. APS’s more differentiated separation of Agency, Evaluation, Significance, and Cognition does not establish APS explanatory gain over the enactivist comparator. The additional distinctions may be useful for other explanatory targets, but no advantage follows merely from possessing the finer partition.

The strongest residual therefore closes without a winner.

What remains is different explanatory partitioning without an authenticated difference in the dependency required by ECT-01.

What the Null Result Means

An empty residual register can easily be misunderstood.

It does not mean that APS and enactivism are the same theory. They are not. They begin from different conceptual traditions, organise their explanatory resources differently, and place different emphasis on autonomy, adaptivity, agency, evaluation, significance, sense-making, and cognition.

Nor does the result establish that APS is merely enactivism expressed in different vocabulary. A finding of matched dependency coverage does not erase theoretical architecture. Conceptual distinctions can affect what questions are readily formulated, where explanatory boundaries are drawn, which dependencies become salient, and how a framework can subsequently be extended or tested.

But those facts do not reverse the burden of proof.

If two architectures address a common target and one partitions the target more finely, the finer partition cannot be credited as explanatory gain until it changes the explanation. It must identify a dependency that the coarser architecture misses, exclude an inference the comparator incorrectly permits, generate a discriminatory prediction, resolve an otherwise unexplained case, or otherwise alter explanatory adequacy for the matched target.

ECT-01 provides no such result for APS.

The same rule applies in the opposite direction. The enactivist distinction between autonomy and adaptivity is explanatorily important because it prevents autonomy from being treated as sufficient for graded viability-sensitive regulation. But once APS is tested rather than merely compared terminologically, its evaluative-regulatory architecture supplies the corresponding explanatory work. The explicitness of the enactivist distinction does not by itself establish superiority.

The result can therefore be stated as target-matched functional dependency equivalence under distinct explanatory partitioning.

This is deliberately narrower than theoretical equivalence.

The frameworks remain architecturally non-identical. What the comparison fails to establish is that their non-identity produces a difference in the operative dependencies required to explain ECT-01.

Three distinctions must consequently be preserved:

architectural non-identity ≠ explanatory non-equivalence

explanatory non-equivalence ≠ comparative explanatory superiority

and:

conceptual granularity ≠ explanatory gain

These distinctions matter beyond this particular comparison. General biological frameworks often appear to compete by offering different conceptual organisations of familiar biological phenomena. A framework may introduce a new vocabulary, distinguish processes previously grouped together, or organise causal and normative relations in a novel sequence. Such changes can improve clarity and generate new research questions. But they cannot be counted as explanatory advances simply because the architecture is more differentiated or internally coherent.

A demanding comparison asks what follows for a common explanandum.

In the present case, the answer is restrictive. APS and biologically grounded enactivism organise the relevant biological territory differently, but neither has been shown to explain ECT-01 through an operative dependency unavailable to the other.

The null result is therefore not a failure of the comparison. It is the result produced by the comparison.

Limits and Open Questions

The conclusion is bounded by the target.

ECT-01 concerns the materially realised organisational dependencies through which changing internal and external conditions become consequential for a living system’s continued organisation and modulate its activity accordingly. It does not encompass everything enactivism attempts to explain, and it does not test every distinctive commitment of APS.

The comparison therefore does not establish framework-wide equivalence between APS and enactivism.

Enactivist work extends into embodiment, phenomenology, sensorimotor organisation, participatory sense-making, social interaction, language, and other areas not tested here. APS extends across biological domains and explanatory questions that are likewise outside ECT-01. Nothing in the present result establishes how the frameworks would compare on those targets.

One particularly important boundary concerns the relation between life and cognition.

Some strong enactivist formulations connect autonomy and adaptivity to sense-making and treat sense-making as cognition in a broad sense. This supports a strong continuity between life and mind. That position is significant within the enactivist family, but it should not be attributed indiscriminately to every account described as enactive.

APS draws the boundary differently. Biological agency and Biological Evaluation do not themselves constitute cognition. Cognition requires the further condition that integrated biological significance modulate activity across a temporal field of viability-relevant possibilities in ways not exhausted by immediate or fixed regulation.

This difference may be explanatorily important.

It has not been tested here.

To convert the difference into evidence for either framework would require a new common target: one capable of testing what explanatory work is performed by identifying or separating minimal biological sense-making and cognition. Such a comparison would need its own strongest comparator, dependency reconstruction, adverse outcomes, and redescription controls.

It would be methodologically improper to open that target simply because ECT-01 produced no comparative winner. Searching for a new battlefield whenever a comparison yields equivalence would make explanatory superiority effectively unfalsifiable.

The life–cognition relation therefore remains an independent possible research question, not a residual rescued from the present comparison.

A second limitation concerns empirical discrimination. ECT-01 is an organisational explanatory target. The present comparison asks what dependencies the two architectures require, not whether one currently generates more successful quantitative predictions across particular experimental systems. A matched empirical comparison could produce a different result, but it would need a specified biological case and an evidential design appropriate to that target.

A third limitation concerns the meaning of coverage. APS coverage of an enactivist dependency does not imply historical derivation, conceptual identity, or theoretical incorporation. It means only that APS possesses resources sufficient to represent the dependency relevant to ECT-01. The historical and philosophical relations between the traditions are separate questions.

Finally, the comparison does not imply that architectural differences are explanatorily unimportant. Their importance remains conditional. A distinction that produces no gain for ECT-01 may prove indispensable for another target. The appropriate conclusion is therefore not that architecture does not matter, but that its explanatory significance must be demonstrated rather than presumed.

Conclusion

APS and biologically grounded enactivism are not the same explanatory framework.

Enactivism develops a biologically grounded architecture of autonomous individuality, precariousness, intrinsic normativity, adaptivity, viability-sensitive regulation, organism–environment coupling, sense-making, and agency. APS approaches overlapping territory through viability-oriented, constraint-closed organisation, biological agency, Biological Evaluation, significance, organised persistence, and a separately specified boundary for cognition.

Those differences establish architectural non-identity.

They do not, for ECT-01, establish explanatory victory.

When the strongest biologically grounded enactivist account is reconstructed independently and the two frameworks are subsequently constrained to the same target, APS provides full coverage of six of the eight comparator dependencies and partial coverage of two. The strongest apparent residual concerns the enactivist insistence that autonomy alone is insufficient for adaptive regulation. Yet APS does not infer appropriate regulation directly from living organisation: Biological Evaluation and significance supply the intermediate discriminatory relation through which differences bearing upon viability can modulate activity.

The residual therefore does not survive as a demonstrated difference in explanatory dependency.

Conversely, APS cannot convert its finer conceptual partition into explanatory gain. Distinguishing agency, evaluation, significance, integration, and cognition may increase articulation and may matter for other explanatory targets, but conceptual granularity is not itself an explanatory achievement over a comparator that supplies the operative dependencies required by the target.

The comparison therefore supports a deliberately constrained conclusion:

APS and biologically grounded enactivism remain architecturally non-identical, while ECT-01 exhibits target-matched functional dependency equivalence under their different explanatory partitionings. Neither framework has established comparative explanatory gain over the other for this target.

This conclusion changes the significance of the question posed by the original Why Life Is Not Enactivism. Non-identity remains true, but non-identity is no longer the principal result. The more demanding result concerns what follows when theoretical difference is subjected to explanatory comparison.

A framework earns comparative explanatory gain not by possessing a distinctive vocabulary, a more elaborate conceptual architecture, or a finer partition of the explanandum, but by showing that those differences make a difference to explanation.

For the target examined here, neither APS nor its strongest biologically grounded enactivist comparator has yet done so.

Explanatory Architecture

Central Explanatory Question

What explanatory difference follows when APS and the strongest biologically grounded enactivist account are required to explain the same viability-sensitive problem of living organisation?

Common Target

ECT-01: What materially realised organisational dependencies enable a living system to regulate its activity in relation to changing internal and external conditions such that differences in those conditions matter to the continuation of its own organisation?

Comparator Result

The strongest biologically grounded enactivist comparator supplies dependencies involving autonomous individuality, precarious organisation, intrinsic normativity, the insufficiency of autonomy alone for adaptive regulation, viability-sensitive discrimination, endogenous regulation of organism–environment coupling, organism-relative significance or sense-making, and agency specified through individuality, normativity, and interactional asymmetry.

APS Result

APS fully covers ENA-01, ENA-02, ENA-03, ENA-05, ENA-06, and ENA-07, and partially covers ENA-04 and ENA-08. Neither partial-coverage case survives as a demonstrated comparator advantage for ECT-01.

Comparative Result

Target-matched functional dependency equivalence under distinct explanatory partitioning.

The result establishes neither framework-wide equivalence nor comparative superiority.

Explanatory-Gain Control

Architectural difference, conceptual granularity, terminological difference, and greater explicitness do not constitute explanatory gain unless they establish a difference in the dependencies required for a matched explanatory target.

Related Explanatory Questions

The present result leaves open whether APS and enactivist approaches differ explanatorily when the matched target concerns the relation between life and cognition, sensorimotor cognition, phenomenology, social sense-making, or another independently specified explanandum.

Those questions require separate comparison. They cannot be inferred from ECT-01 and should not be opened merely to recover a comparative difference absent from the present test.

Position Within APS

This article is a strongest-comparator clarification rather than a demonstration of APS superiority. Its function is to distinguish theoretical and architectural non-identity from comparative explanatory gain and to subject APS itself to the same redescription control applied to competing frameworks.

The conclusion is therefore deliberately symmetric. APS and biologically grounded enactivism organise ECT-01 differently. For this target, neither has yet demonstrated an explanatory dependency unavailable to the other.