Biology & Philosophy

Why development matters Abstract Günter Wagner’s Homology, Genes, and Evolutionary Innovation is a compelling, and empirically well-supported account of the evolution of character identity and character origination which emphasizes the importance of homology and novelty as central explananda for 21st century evolutionary biology (and developmental bias as a key explanans). In this essay review, I focus on the similarities and differences between the structuralist picture of evolutionary biology advocated by Wagner, and that presented by standard evolutionary theory. First, I outline the ways in which Wagner’s genetic theory of homology diverges from the account of homology offered by standard evolutionary theory. Then, I consider the motivations for these divergences. Lastly, I discuss a number of concerns with Wagner’s view, and offer some concluding thoughts on the relationship between structuralism and adaptationism.

Homology and the evolutionary process: reply to Haig, Love and Brown on “Homology, Genes and Evolutionary Innovation” Abstract This paper responds to the essay reviews by David Haig, Alan Love and Rachel Brown of my recently published book “Homology, Genes and Evolutionary Innovation” (HGEI). The issues addressed here relate to: (1) the notion of classes and individuals, (2) issues of explanatory value of adaptive and structuralist explanations in evolutionary biology, (3) the role of homology in evolutionary theory, (4) the limits of a pluralist stance vis a vis alternative explanations of homology, as well as (5) the question whether and to what extend the perspective laid out in HGEI can be or should be transferred to other branches of study, like comparative behavioral biology.

Schrödinger’s microbe: implications of coercing a living organism into a coherent quantum mechanical state Abstract Consideration of the experimental activities carried out in one discipline, through the lens of another, can lead to novel insights. Here, we comment from a biological perspective upon experiments in quantum mechanics proposed by physicists that are likely to feasible in the near future. In these experiments, an entire living organism would be knowingly placed into a coherent quantum state for the first time, i.e. would be coerced into demonstrating quantum phenomena. The implications of the proposed experiment for a biologist depend to an extent upon the outcomes. If successful (i.e. quantum coherence is achieved and the organism survives after returning to a normal state), then the organism will have been temporarily in a state where it has an unmeasurable metabolism—not because a metabolic rate is undetectable, but because any attempt to measure it would automatically bring the organism out of the state. We argue that this would in essence represent a new category of cryptobiosis. Further, the organism would not necessarily retain all of the characteristics commonly attributed to living systems, unlike the currently known categories of cryptobiosis. If organisms can survive having previously been in a coherent state, then we must accept that living systems do not necessarily need to remain in a decoherent state at all times. This would be something new to biologists, even if it might seem trivial to physicists. It would have implications concerning the physical extremes organisms can tolerate, the search for extraterrestrial life, and our philosophical view of animation.

ChINs, swarms, and variational modalities: concepts in the service of an evolutionary research program Abstract Günter Wagner’s Homology, Genes, and Evolutionary Innovation (2014) collects and synthesizes a vast array of empirical data, theoretical models, and conceptual analysis to set out a progressive research program with a central theoretical commitment: the genetic theory of homology. This research program diverges from standard approaches in evolutionary biology, provides sharpened contours to explanations of the origin of novelty, and expands the conceptual repertoire of evolutionary developmental biology (Evo–devo). I concentrate on four aspects of the book in this essay review: (1) the genetic theory of homology and character identity networks; (2) the implications for how we explain evolutionary novelties; (3) the expanded set of concepts surrounding homology, and (4) the epistemological conflicts between Wagner’s viewpoint and functionally-oriented evolutionary biology, as well as differences with other Evo–devo researchers. Together these have ramifications for how we interpret different explanatory approaches to evolutionary phenomena and understand relationships between the usefulness of concepts and the reality they represent.

Moving parts: the natural alliance between dynamical and mechanistic modeling approaches Abstract Recently, it has been provocatively claimed that dynamical modeling approaches signal the emergence of a new explanatory framework distinct from that of mechanistic explanation. This paper rejects this proposal and argues that dynamical explanations are fully compatible with, even naturally construed as, instances of mechanistic explanations. Specifically, it is argued that the mathematical framework of dynamics provides a powerful descriptive scheme for revealing temporal features of activities in mechanisms and plays an explanatory role to the extent it is deployed for this purpose. It is also suggested that more attention should be paid to the distinctive methodological contributions of the dynamical framework including its usefulness as a heuristic for mechanism discovery and hypothesis generation in contemporary neuroscience and biology.

Dismantling standard cognitive science: it’s time the dog has its day Abstract I argue that the standard paradigm for understanding cognition—namely, that thoughts are representational, internal, and propositional—does not account for a large number of genuinely cognitive processes. Instead, if we adopt a more radical approach, one that treats cognition as a cooperative, dynamic, and interactive process, accounting for shared meaning making and embodied thought becomes much more plausible. To support this thesis, rather than turn to the debate as it has been ongoing among philosophers of mind pertaining solely to human thought, I examine our interactions with other animals, and thus, I take a more biological approach to how thought evolves and emerges. Chiefly, I look at the ways in which human-canine interaction (1) ought to count as producing genuinely cognitive phenomena that (2) cannot be properly explicated under a standard model of cognition, and (3) that these sorts of interactive and dynamic pairings between us and our dogs can serve as models for human minds, which I argue are much more shared and cooperative than competing accounts of cognition would have us believe.

Sameness, novelty, and nominal kinds Abstract Organisms and their genomes are mosaics of features of different evolutionary age. Older features are maintained by ‘negative’ selection and comprise part of the selective environment that has shaped the evolution of newer features by ‘positive’ selection. Body plans and body parts are among the most conservative elements of the environment in which genetic differences are selected. By this process, well-trodden paths of development constrain and direct paths of evolutionary change. Structuralism and adaptationism are both vindicated. Form plays a selective role in the molding of form.

Are natural selection explanatory models a priori? Abstract The epistemic status of Natural Selection (NS) has seemed intriguing to biologists and philosophers since the very beginning of the theory to our present times. One prominent contemporary example is Elliott Sober, who claims that NS, and some other theories in biology, and maybe in economics, are peculiar in including explanatory models/conditionals that are a priori in a sense in which explanatory models/conditionals in Classical Mechanics (CM) and most other standard theories are not. Sober’s argument focuses on some “would promote” sentences that according to him, play a central role in NS explanations and are both causal and a priori. Lange and Rosenberg criticize Sober arguing that, though there may be some unspecific a priori causal claims, there are not a priori causal claims that specify particular causal factors. Although we basically agree with Lange and Rosenberg’s criticism, we think it remains silent about a second important element in Sober’s dialectics, namely his claim that, contrary to what happens in mechanics, in NS explanatory conditionals are a priori, and that this is so in quite specific explanatory models. In this paper we criticize this second element of Sober’s argument by analyzing what we take to be the four possible interpretations of Sober’s claim, and argue that, terminological preferences aside, the possible senses in which explanatory models in NS can qualify, or include elements that can qualify, as a priori, also apply to CM and other standard, highly unified theories. We conclude that this second claim is unsound, or at least that more needs to be said in order to sustain that NS explanatory models are a priori in a sense in which CM models are not.

Emotions without objects Abstract It is widely assumed that emotions have particular intentional objects. This assumption is consistent with the way that we talk: when we attribute states of anger, we often attribute anger at someone, or at something. It is also consistent with leading theories of emotion among philosophers and psychologists, according to which emotions are like judgments or appraisals. However, there is evidence from the social psychology literature suggesting that this assumption is actually false. I will begin by presenting a criterion for determining whether a mental state has a particular object. It is not sufficient for that state to be caused by an object or by a representation of a given object—the state must influence the subject’s thought and behavior in ways that are specific to that object. I will present evidence that emotions fail this test, and describe some of the reasons why we persistently attribute objects to our emotions. My view may seem untenable, because the literature on various aspects of emotional life such as normativity, linguistic expression, and behavioral influence consistently appeals to intentional objects. I will conclude by presenting a sketch of how I could address this concern.

Cultural longevity: Morin on cultural lineages Abstract Morin has written a rich and valuable book. Its main aim is to isolate the factors involved in maintaining behavioural lineages over time, and to understand how these factors might interact. In doing so, it takes issue with the abstract and idealised models and arguments of dual-inheritance theorists, which are alleged in this account to rely on an overly simplistic notion of imitative learning. Morin’s book is full of ethnographic, anthropological, and psychological research, and there is much to commend in it. However, Morin’s arguments against the dual-inheritance theorists are less convincing when put under scrutiny, and his positive picture which includes appeals to ostensive communication, intrinsic appeal and cultural attraction has some difficulties. I argue that when we contrast dual-inheritance theorists and Morin, we find that there may be fewer differences and greater commonalities than Morin’s book might suggest.