Michael David Kirchhoff

Most philosophical accounts of emergence are based on supervenience, with supervenience being an ontologically synchronic relation of determination. This conception of emergence as a relation of supervenience, I will argue, is unable to make sense of the kinds of emergence that are widespread in self-organizing and nonlinear dynamical systems, including distributed cognitive systems. In these dynamical systems, an emergent property is ontological (i.e., the causal capacities of P, where P is an emergent feature, are not reducible to causal capacities of the parts, and may exert a top-down causal influence on the parts of the system) and diachronic (i.e., the relata of emergence are temporally extended, and P emerges as a result of some dynamical lower-level processes that unfold in real time).

Cognitive scientists speak of codes, signals, encoding, decoding, computation, representation, and information-processing. The orthodox view is to take talk of neuronal signaling and computational processes over mental representations literally – as truth-conditioned descriptions of brain and cognitive activity. Mental fictionalism challenges the orthodox view. Mental fictionalism is, broadly speaking, the view that talk about mental representation is a useful fiction. Many mental fictionalists motivate this view by an analogy with how scientists make use of idealization techniques in model-based sciences such as physics. I assume, without argument, that discourse about mental representation in cognitive science is fictional. However, I argue that it is not a useful fiction because fictional discourse about mental representation fails to be genuinely explanatory. It fails to be genuinely explanatory because idealized posits such as mental representation are functionally disanalogous to useful idealizations in other sciences such as biology and physics.

The Idealized Mind seeks to establish three claims: (a) contrary to prevailing assumptions, some of the most foundational concepts in cognitive science—representation and computation—are akin to idealized concepts in other sciences such as ideal gases, infinite populations and frictionless planes; (b) scientific models are abstract explanatory devices that exist mainly in the imagination of the communities that use them to describe, explain, and predict aspects of the natural world; and, finally, (c) none of this precludes endorsing scientific realism in the context of scientific modeling in cognitive science—the view that one reasonable aim of science is to provide true, or approximately true, descriptions of the natural world, including the mind and brain.

Clark and Chalmers (Analysis 58:7–19, 1998) landmark paper, The Extended Mind, launched a thousand ships and changed the contours of the larger sea of theorizing about cognition. Over the past twenty-six years, it has led to intense philosophical debates about of the constitutive bounds of mind and cognition and generated multiple waves of work taking the form of various attempts to clarify and defend its core thesis. The extended mind thesis states that under certain (specialized and particular) conditions cognitive processes may be constituted by resources distributed across the brain, the body, and the environment. The extended mind thesis is part of a larger family of theoretical frameworks such as embodied cognition, distributed cognition, and various versions of enactivism (Gallagher in South J Philos 56: 421–447, 2018; Hutchins in Cognition in the wild, The MIT Press, 1995; Varela et al. in The embodied mind: cognitive science and human experience, The MIT Press, 1991; Di Paolo in Topoi 28:9–21, 2009; Hutto and Myin in Radicalizing enactivism: basic minds without content, The MIT Press, 2013; Hutto and Myin in Evolving enactivism: basic minds meet content, The MIT Press, 2017). In this paper we revive and clarify the commitments of Radical Enactivism’s Extensive Enactivism, compare it to alternatives, and provide new arguments and analyses for preferring it over what is on offer from other members of the extended-distributed-enactive family of positions.

It is often argued that constitution and causation are different kinds of dependence relations. Some have argued for a distinction between constitutive explanation of causal capacities that explain what a system would do in specific situations from causal or etiological explanations that explain why an event such as a change in the property of a system happened. In what follows we argue against the claim that causation and constitution are always distinct metaphysical relations. This paper develops a temporal account of constitution. We call this species of constitution, diachronic constitution. We show how diachronic constitution is a consequence of a common type of causation in the empirical sciences: continuous reciprocal causation, a variety of causal production instantiated in complex dynamical systems. Hence, this paper seeks to establish that constitution does not only resemble causation in certain respects. We argue for the stronger claim that constitution can be analysed in terms of causation understood as production of change. Temporalizing the constitution relation is neither as remarkable nor as problematic as it might initially seem. The idea of diachronic constitution will appear almost inevitable in the context of complex dynamical systems, given local interactions between microscale and macroscale states in such systems.

Upshot: We respond to three main challenges that the commentaries have raised. First, we argue that to deal successfully with the hard problem of consciousness, it is not enough to posit a remedy by which to move beyond the hard problem. Second, we argue that it makes no sense to explain identity. Yet this does not commit us to definitions by fiat. The strategy we pursue here, and in the target article, is not to explain identity but to explain away the appearance of non-identity. Finally, while we are sympathetic to Varela’s call for a paradigm shift in consciousness studies, we argue here, and in the target article, that this call can only be properly successful if the hard problem is dismantled.

This paper aims to provide a theoretical framework for explaining the subjective character of pain experience in terms of what we will call ‘embodied predictive processing’. The predictive processing (PP) theory is a family of views that take perception, action, emotion and cognition to all work together in the service of prediction error minimisation. In this paper we propose an embodied perspective on the PP theory we call the ‘embodied predictive processing (EPP) theory. The EPP theory proposes to explain pain in terms of processes distributed across the whole body. The prediction error minimising system that generates pain experience comprises the immune system, the endocrine system, and the autonomic system in continuous causal interaction with pathways spread across the whole neural axis. We will argue that these systems function in a coordinated and coherent manner as a single complex adaptive system to maintain homeostasis. This system, which we refer to as the neural-endocrine-immune (NEI) system, maintains homeostasis through the process of prediction error minimisation. We go on to propose a view of the NEI ensemble as a multiscale nesting of Markov blankets that integrates the smallest scale of the cell to the largest scale of the embodied person in pain. We set out to show how the EPP theory can make sense of how pain experience could be neurobiologically constituted. We take it to be a constraint on the adequacy of a scientific explanation of subjectivity of pain experience that it makes it intelligible how pain can simultaneously be a local sensing of the body, and, at the same time, a more global, all-encompassing attitude towards the environment. Our aim in what follows is to show how the EPP theory can meet this constraint.

Open peer commentary on the article “A Moving Boundary, a Plastic Core: A Contribution to the Third Wave of Extended-Mind Research” by Timotej Prosen. Abstract: We explore both some novel claims made by Prosen’s account of plastic cores and some overlaps between his and other accounts of third-wave extended mind. In the first instance we discuss whether the Markov blanket formalism should be regarded as incompatible with a third-wave extended view. Secondly, we discuss whether Prosen’s proposal of a plastic core quite meets the radical departure of the third wave from organism-centeredness - or whether Prosen’s contribution might be more aptly considered as a compromise between second- and third-wave extended mind.

Context: A central motivation behind various embodied, extended, and enactive (4E) approaches to cognition is to ground our understanding of minds and cognition within the biological structures that give rise to life. Because of this, their advocates often claim a natural kinship with dynamical and developmental systems theories. However, these accounts also explicitly or implicitly privilege individual organisms in ways that contrast with many of the insights of systems and developmental systems approaches to biology. Problem: The prioritization of individual organisms within 4E approaches to cognition contrasts with the default entangled structure of biological systems associated with cognitive agency. We provide means for 4E cognitive science to move beyond an individual-centred view of cognitive agency. Method: We first identify and problematize individual-centredness within various predominant 4E approaches by comparison with biological research and developmental systems theory. Subsequently, we offer conceptual resources from the field of ecological research for understanding cognitive agency beyond the predominant focus on individual organisms. Results: Cognitive agency may be understood without privileging individual organisms by reading nonequilibrium maintenance in terms of a dynamic differentiation instead of individual organismic autonomy. This form of organizational structure corresponds to the notion of sympoiesis from ecological research. Implications: Approaching cognitive agency without privileging individual organisms should be invaluable to advocates of 4E cognition seeking to ground notions of cognition and mind within contemporary biological research. Constructivist content: We seek to expand upon existing constructivist perspectives on the organizing principles of cognitive agency, such as sensorimotor embodiment and autopoiesis, arguing that meta-organismic cognitive agents (including humans) embody distributed relations beyond the privileging of individual organisms. Key words: 4E cognition, autopoiesis, cognitive agency, developmental systems theory, enactivism, extended mind thesis, holobionts, sympoeisis.

The discussion of extended cognition is premised on a metaphysical distinction between causation and constitution. For example, Rowlands (2009) notes that “EM [extended mind] is a claim about the composition or constitution of (some) mental processes” (2009, p. 54). Or, as Wheeler puts it: “Bare causal dependency of mentality on external factors […] is simply not enough for genuine cognitive extension. What is needed is constitutive dependence” (2010, p. 246). In this sense, Krickel (this volume) rightly notes that the current disagreement between friends and foes of extended cognition turns on a metaphysical dispute about what is constitutive of mentality and how to locate those constituents. Krickel (this volume) argues that our account of diachronic constitution fails to provide a convincing answer to the metaphysical dispute about ‘what is constitutive’ of mentality and ‘how to locate’ the relevant constituents. The central reason is that diachronic constitution fails the so-called ‘co-location condition,’ which Krickel argues is a necessary condition that an account of constitution must meet in the discussion over the extended mind. The co-location condition asserts that ‘cognition is located where and only where its constituents are located.’ We expose an ambiguity in the co-location condition, and show why this condition is no threat to our account of diachronic constitution. We conclude that the co-location condition is not a necessary condition that an account of constitution in the discussion over the extended mind must adhere to.

This chapter questions the causal-constitution fallacy raised against the extended mind. It does so by presenting our signature temporal thesis about how to understand constitutive relations in the context of the extended mind, and with respect to dynamical systems, more broadly. We call this thesis diachronic constitution. We will argue that temporalising the constitution relation is not as remarkable (nor problematic) as it might initially seem. It is (arguably) inevitable, given local interactions between microscale and macroscale states of (coupled) dynamical systems. We focus primarily on the metaphysics of the extended mind in this paper. However, we also show how our account of diachronic constitution has important implications for the metaphysics of dependence relations more generally as well as an emerging literature on inter-level explanations in the mechanistic framework applied to the discussion over extended, enactive and embodied cognition.

We are grateful to Facchin and Negro (henceforth F&N) for their rich and generous engagement with our arguments for the hypothesis of the extended conscious mind (ECM). They offer a careful and insightful reconstruction of the key arguments from our 2019 monograph (Kirchhoff & Kiverstein, 2019a). In the end however they are not persuaded by the arguments of our book and raise a number of intriguing and puzzling challenges. We deal with each of their challenges and conclude that these challenges pose no problems for our arguments for the ECM in Kirchhoff & Kiverstein (2019a).

We develop a truism of commonsense psychology that perception and action constitute the boundaries of the mind. We do so however not on the basis of commonsense psychology, but by using the notion of a Markov blanket originally employed to describe the topological properties of causal networks. We employ the Markov blanket formalism to propose precise criteria for demarcating the boundaries of the mind that unlike other rival candidates for “marks of the cognitive” avoids begging the question in the extended mind debate. Our criteria imply that the boundary of the mind is nested and multiscale sometimes extending beyond the individual agent to incorporate items located in the environment. Chalmers has used commonsense psychology to develop what he sees as the most serious challenge to the view that minds sometimes extend into the world. He has argued that perception and action should be thought of as interfaces that separate minds from their surrounding environment. In a series of recent papers Hohwy has defended a similar claim using the Markov blanket formalism. We use the Markov blanket formalism to show how both of their objections to the extended mind fail.

Radical enactive and embodied approaches to cognitive science oppose the received view in the sciences of the mind in denying that cognition fundamentally involves contentful mental representation. This paper argues that the fate of representationalism in cognitive science matters significantly to how best to understand the extent of cognition. It seeks to establish that any move away from representationalism toward pure, empirical functionalism fails to provide a substantive “mark of the cognitive” and is bereft of other adequate means for individuating cognitive activity. It also argues that giving proper attention to the way the folk use their psychological concepts requires questioning the legitimacy of commonsense functionalism. In place of extended functionalism—empirical or commonsensical—we promote the fortunes of extensive enactivism, clarifying in which ways it is distinct from notions of extended mind and distributed cognition.

Biological agents can act in ways that express a sensitivity to context-dependent relevance. So far it has proven difficult to engineer this capacity for context-dependent sensitivity to relevance in artificial agents. We give this problem the label the “problem of meaning”. The problem of meaning could be circumvented if artificial intelligence researchers were to design agents based on the assumption of the continuity of life and mind. In this paper, we focus on the proposal made by enactive cognitive scientists to design artificial agents that possess sensorimotor autonomy—stable, self-sustaining patterns of sensorimotor interaction that can ground values, norms and goals necessary for encountering a meaningful environment. More specifically, we consider whether the Free Energy Principle (FEP) can provide formal tools for modeling sensorimotor autonomy. There is currently no consensus on how to understand the relationship between enactive cognitive science and the FEP. However, a number of recent papers have argued that the two frameworks are fundamentally incompatible. Some argue that biological systems exhibit historical path-dependent learning that is absent from systems that minimize free energy. Others have argued that a free energy minimizing system would fail to satisfy a key condition for sensorimotor agency referred to as “interactional asymmetry”. These critics question the claim we defend in this paper that the FEP can be used to formally model autonomy and adaptivity. We will argue it is too soon to conclude that the two frameworks are incompatible. There are undeniable conceptual differences between the two frameworks but in our view each has something important and necessary to offer. The FEP needs enactive cognitive science for the solution it provides to the problem of meaning. Enactive cognitive science needs the FEP to formally model the properties it argues to be constitutive of agency. Our conclusion will be that active inference models based on the FEP provides a way by which scientists can think about how to address the problems of engineering autonomy and adaptivity in artificial agents in formal terms. In the end engaging more closely with this formalism and its further developments will benefit those working within the enactive framework.

Disagreement about how best to think of the relation between theories and the realities they represent has a long-standing and venerable history. We take up this debate in relation to active inference models based on the free energy principle (FEP)—a contemporary framework in computational neuroscience, theoretical biology, and the philosophy of cognitive science. Active inference under the FEP is a very ambitious form of model-based science, being applied to explain everything from neurobiological structure and function to the biology of self-organization. In this context, some find apparent discrepancies between the map (active inference models based on the FEP) and the territory (target systems) to be a compelling reason to defend instrumentalism about such models. We take this to be misguided. We identify an important fallacy made by those defending instrumentalism about active inference models. We call it the literalist fallacy: this is the fallacy of accepting or affirming instrumentalism based on the claim that the properties of active inference models based on the FEP do not literally map onto real-world target systems. We conclude that a version of scientific realism about active inference models under the FEP is a live and tenable option.

This paper aims to provide a theoretical framework for explaining the subjective character of pain experience in terms of what we will call ‘embodied predictive processing’. The predictive processing (PP) theory is a family of views that take perception, action, emotion and cognition to all work together in the service of prediction error minimisation. In this paper we propose an embodied perspective on the PP theory we call the ‘embodied predictive processing (EPP) theory. The EPP theory proposes to explain pain in terms of processes distributed across the whole body. The prediction error minimising system that generates pain experience comprises the immune system, the endocrine system, and the autonomic system in continuous causal interaction with pathways spread across the whole neural axis. We will argue that these systems function in a coordinated and coherent manner as a single complex adaptive system to maintain homeostasis. This system, which we refer to as the neural-endocrine-immune (NEI) system, maintains homeostasis through the process of prediction error minimisation. We go on to propose a view of the NEI ensemble as a multiscale nesting of Markov blankets that integrates the smallest scale of the cell to the largest scale of the embodied person in pain. We set out to show how the EPP theory can make sense of how pain experience could be neurobiologically constituted. We take it to be a constraint on the adequacy of a scientific explanation of subjectivity of pain experience that it makes it intelligible how pain can simultaneously be a local sensing of the body, and, at the same time, a more global, all-encompassing attitude towards the environment. Our aim in what follows is to show how the EPP theory can meet this constraint.

Disagreement about how best to think of the relation between theories and the realities they represent has a longstanding and venerable history. We take up this debate in relation to the free energy principle (FEP) - a contemporary framework in computational neuroscience, theoretical biology and the philosophy of cognitive science. The FEP is very ambitious, extending from the brain sciences to the biology of self-organisation. In this context, some find apparent discrepancies between the map (the FEP) and the territory (target systems) a compelling reason to defend instrumentalism about the FEP. We take this to be misguided. We identify an important fallacy made by those defending instrumentalism about the FEP. We call it the literalist fallacy: this is the fallacy of inferring the truth of instrumentalism based on the claim that the properties of FEP models do not literally map onto real-world, target systems. We conclude that scientific realism about the FEP is a live and tenable option.

Over the last fifteen years, an ambitious explanatory framework has been proposed to unify explanations across biology and cognitive science. Active inference, whose most famous tenet is the free energy principle, has inspired excitement and confusion in equal measure. Here, we lay the ground for proper critical analysis of active inference, in three ways. First, we give simplified versions of its core mathematical models. Second, we outline the historical development of active inference and its relationship to other theoretical approaches. Third, we describe three different kinds of claim -- labelled mathematical, empirical and general -- routinely made by proponents of the framework, and suggest dialectical links between them. Overall, we aim to increase philosophical understanding of active inference so that it may be more readily evaluated. This the final submitted version of the Introduction to the Topical Collection "The Free Energy Principle: From Biology to Cognition", forthcoming in Biology & Philosophy.

It is often argued that constitution and causation are different kinds of metaphysical relations. Constitution, like other grounding relations, is assumed to be synchronic, while causation is diachronic. It is this synchronic-diachronic division that, more than other difference-makers, is argued to distinguish grounding relations such as constitution from causation. This paper develops an account of a species of constitution that happens over time. We call this type of constitution, diachronic constitution. We show how diachronic constitution is a consequence of a common type of causation, often ignored in metaphysical discussions of causation: continuous reciprocal causation. Hence, constitution is not only sometimes like causation; it can also be a form of causation. We argue that temporalising the constitution relation is neither as remarkable nor as problematic as it might initially seem. It is inevitable, given local interactions between microscale and macroscale states in dynamical systems.

This paper targets the constitutive basis of social cognition. It begins by describing the traditional and still dominant cognitivist view. Cognitivism assumes internalism about the realisers of social cognition; thus, the embodied and embedded elements of intersubjective engagement are ruled out from playing anything but a basic causal role in an account of social cognition. It then goes on to advance and clarify an alternative to the cognitivist view; namely, an enactive account of social cognition. It does so first by articulating a diachronic constitutive account for how embodied engagement can play a constitutive role in social cognition. It then proceeds to consider an objection; the causal-constitutive fallacy (Adams & Aizawa 2001, 2008; Block 2005) against enactive social cognition. The paper proceeds to deflate this objection by establishing that the distinction between constitution and causation is not co-extensive with the distinction between internal constitutive elements and external causal elements. It is then shown that there is a different reason for thinking that an enactive account of social cognition is problematic. We call this objection the ‘poverty of the interactional stimulus argument’. This objection turns on the role and characteristics of anticipation in enactive social cognition. It argues that anticipatory processes are mediated by an internally realised model or tacit theory (Carruthers 2015; Seth 2015). The final part of this paper dissolves this objection by arguing that it is possible to cast anticipatory processes as orchestrated as well as maintained by sensorimotor couplings between individuals in face-to-face interaction.

Cognitive niche construction is the process whereby organisms create and maintain cause–effect models of their niche as guides for fitness influencing behavior. Extended mind theory claims that cognitive processes extend beyond the brain to include predictable states of the world. Active inference and predictive processing in cognitive science assume that organisms embody predictive (i.e., generative) models of the world optimized by standard cognitive functions (e.g., perception, action, learning). This paper presents an active inference formulation that views cognitive niche construction as a cognitive function aimed at optimizing organisms' generative models. We call that process of optimization extended active inference.

In this paper, we offer reasons to justify the explanatory credentials of dynamical modeling in the context of the metaplasticity thesis, located within a larger grouping of views known as 4E Cognition. Our focus is on showing that dynamicism is consistent with interventionism, and therefore with a difference-making account at the scale of system topologies that makes sui generis explanatory differences to the overall behavior of a cognitive system. In so doing, we provide a general overview of the interventionist approach. We then argue that recent mechanistic attempts at reducing dynamical modeling to a merely descriptive enterprise fail given that the explanatory standard in dynamical modeling can be shown to rest on interventionism. We conclude that dynamical modeling captures features of nested and developmentally plastic cognitive systems that cannot be explained by appeal to underlying mechanisms alone.

Context: Neurophenomenology, as formulated by Varela, offers an approach to the science of consciousness that seeks to get beyond the hard problem of consciousness. There is much to admire in the practical approach to the science of consciousness that neurophenomenology advocates. Problem: Even so, this article argues, the metaphysical commitments of the enterprise require a firmer foundation. The root problem is that neurophenomenology, as classically formulated by Varela, endorses a form of non-reductionism that, despite its ambitions, assumes rather than dissolves the hard problem of consciousness. We expose that neurophenomenology is not a natural solution to that problem. We defend the view that whatever else neurophenomenology might achieve, it cannot close the gap between the phenomenal and the physical if there is no such gap to close. Method: Building on radical enactive and embodied approaches to cognitive science that deny that the phenomenal and the physical are metaphysically distinct, this article shows that the only way to deal properly with the hard problem is by denying the metaphysical distinction between the physical and the phenomenal that gives the hard problem life. Results: This article concludes by discussing how neurophenomenology might be reformulated under the auspices of a radically enactive and embodied account of cognition. That is, only by denying that there are two distinct phenomena - the physical and the phenomenal - can the neurophenomenological project get on with addressing its pragmatic problems of showing how neuroscientists may be guided by first-person data in their analysis of third-person experimental data, and vice versa. Implications: The topic addressed in this article is of direct value to consciousness studies in general and specifically for the project of neurophenomenology. If the neurophenomenological project is to deal with the hard problem, it must denude itself of its non-reductionist background assumption and embrace a strict identity thesis. Constructivist content: Radical enactive and embodied approaches to mind and consciousness adopt a view of consciousness as a dynamic activity - something an organism enacts in ongoing engagement with its environment. These approaches therefore share with constructivist approaches an action-based view of mind.

Open peer commentary on the article “Exploring the Depth of Dream Experience: The Enactive Framework and Methods for Neurophenomenological Research” by Elizaveta Solomonova & Xin Wei Sha. Upshot: This commentary focuses on an ontological claim made by the authors of this target article: that perceiving, imagining and dreaming are inseparable. It explores how best to understand this “inseparability condition.” It is shown that the evidence needed to justify a strict reading of the inseparability condition is lacking, while there is room for a more relaxed rendition of the inseparability condition. The inferred lesson is that in developing an enactive neurophenomenology of dreaming, it is a non-trivial task to achieve clarity about the ontology of dreaming, and its relationship to imagining as well as perceiving.

This paper explores several paths a distinctive third wave of extended cognition might take. In so doing, I address a couple of shortcomings of first- and second-wave extended cognition associated with a tendency to conceive of the properties of internal and external processes as fixed and non-interchangeable. First, in the domain of cognitive transformation, I argue that a problematic tendency of the complementarity model is that it presupposes that socio-cultural resources augment but do not significantly transform the brain’s representational capacities during diachronic development. In this paper I show that there is available a much more dynamical explanation—one taking the processes of the brain’s enculturation into patterned practices as transforming the brain’s representational capacities. Second, in the domain of cognitive assembly, I argue that another problematic tendency is an individualistic notion of cognitive agency, since it overlooks the active contribution of socio-cultural practices in the assembly process of extended cognitive systems. In contrast to an individualistic notion of cognitive agency, I explore the idea that it is possible to decentralize cognitive agency to include socio-cultural practices.