Modularity of mind

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Modularity of mind is the notion that a mind may, at least in part, be composed of innate neural structures or mental modules which have distinct, established, and evolutionarily developed functions. However, different definitions of "module" have been proposed by different authors. According to Jerry Fodor, the author of Modularity of Mind, a system can be considered 'modular' if its functions are made of multiple dimensions or units to some degree. [1] One example of modularity in the mind is binding. When one perceives an object, they take in not only the features of an object, but the integrated features that can operate in sync or independently that create a whole. Instead of just seeing red, round, plastic, and moving, the subject may experience a rolling red ball. [2] Binding may suggest that the mind is modular because it takes multiple cognitive processes to perceive one thing.

Contents

Early investigations

Historically, questions regarding the functional architecture of the mind have been divided into two different theories of the nature of the faculties. The first can be characterized as a horizontal view because it refers to mental processes as if they are interactions between faculties such as memory, imagination, judgement, and perception, which are not domain specific (e.g., a judgement remains a judgement whether it refers to a perceptual experience or to the conceptualization/comprehension process). The second can be characterized as a vertical view because it claims that the mental faculties are differentiated on the basis of domain specificity, are genetically determined, are associated with distinct neurological structures, and are computationally autonomous. [3]

The vertical vision goes back to the 19th-century movement called phrenology and its founder Franz Joseph Gall. Gall claimed that the individual mental faculties could be associated precisely, in a one-to-one correspondence, with specific physical areas of the brain. [4] For example, someone's level of intelligence could be literally "read off" from the size of a particular bump on his posterior parietal lobe. Phrenology's practice was debunked scientifically by Pierre Flourens in the 19th century. He destroyed parts of pigeons' and dogs' brains, called lesions, and studied the organisms' resulting dysfunction. He was able to conclude that while the brain localizes in some functions, it also works as a unit and is not as localized as earlier phrenologists thought. [4] Before the early 20th century, Edward Bradford Titchener studied the modules of the mind through introspection. He tried to determine the original, raw perspective experiences of his subjects. For example, if he wanted his subjects to perceive an apple, they would need to talk about spatial characteristics of the apple and the different hues that they saw without mentioning the apple. [4]

Fodor's Modularity of Mind

In the 1980s, however, Jerry Fodor revived the idea of the modularity of mind, although without the notion of precise physical localizability. Drawing from Noam Chomsky's idea of the language acquisition device and other work in linguistics as well as from the philosophy of mind and the implications of optical illusions, he became a major proponent of the idea with the 1983 publication of Modularity of Mind. [3]

According to Fodor, a module falls somewhere between the behaviorist and cognitivist views of lower-level processes.

Behaviorists tried to replace the mind with reflexes, which are, according to Fodor, encapsulated (cognitively impenetrable or unaffected by other cognitive domains) and non-inferential (straight pathways with no information added). Low-level processes are unlike reflexes in that they can be inferential. This can be demonstrated by poverty of the stimulus argument, which posits that children do not only learn language from their environment, but are innately programmed with low-level processes that help them seek and learn language. The proximate stimulus, that which is initially received by the brain (such as the 2D image received by the retina), cannot account for the resulting output (for example, our 3D perception of the world), thus necessitating some form of computation. [5]

In contrast, cognitivists saw lower-level processes as continuous with higher-level processes, being inferential and cognitively penetrable (influenced by other cognitive domains, such as beliefs). The latter has been shown to be untrue in some cases, such as the Müller-Lyer illusion, which can persist despite a person's awareness of their existence. [6] This is taken to indicate that other domains, including one's beliefs, cannot influence such processes.

Fodor arrives at the conclusion that such processes are inferential like higher-order processes and encapsulated in the same sense as reflexes.

Although he argued for the modularity of "lower level" cognitive processes in Modularity of Mind he also argued that higher-level cognitive processes are not modular since they have dissimilar properties. The Mind Doesn't Work That Way, a reaction to Steven Pinker's How the Mind Works , is devoted to this subject.

Fodor (1983) states that modular systems must—at least to "some interesting extent"—fulfill certain properties:

  1. Domain specificity: modules only operate on certain kinds of inputs—they are specialised
  2. Obligatory firing: modules process in a mandatory manner
  3. Limited accessibility: what central processing can access from input system representations is limited
  4. Fast speed: probably due to the fact that they are encapsulated (thereby needing only to consult a restricted database) and mandatory (time need not be wasted in determining whether or not to process incoming input)
  5. Informational encapsulation: modules need not refer to other psychological systems in order to operate
  6. Shallow outputs: the output of modules is very simple
  7. Specific breakdown patterns
  8. Characteristic ontogeny: there is a regularity of development
  9. Fixed neural architecture.

Pylyshyn (1999) has argued that while these properties tend to occur with modules, one—information encapsulation—stands out as being the real signature of a module; that is the encapsulation of the processes inside the module from both cognitive influence and from cognitive access. [7] One example is that conscious awareness that the Müller-Lyer illusion is an illusion does not correct visual processing. [8]

Evolutionary psychology and massive modularity

The definition of module has caused confusion and dispute. In J.A. Fodor's views, modules can be found in peripheral and low-level visual processing, but not in central processing. Later, he narrowed the two essential features to domain-specificity and information encapsulation. According to Frankenhuis and Ploeger, domain-specificity means that "a given cognitive mechanism accepts, or is specialized to operate on, only a specific class of information". [8] Information encapsulation means that information processing in the module cannot be affected by information in the rest of the brain. One example is that the effects of an optical illusion, created by low-level processes, persist despite high-level processing caused by conscious awareness of the illusion itself. [8]

Other perspectives on modularity come from evolutionary psychology. Evolutionary psychologists propose that the mind is made up of genetically influenced and domain-specific [9] mental algorithms or computational modules, designed to solve specific evolutionary problems of the past. [10] Modules are also used for central processing. This theory is sometimes referred to as massive modularity. [8] Leda Cosmides and John Tooby claimed that modules are units of mental processing that evolved in response to selection pressures. To them, each module was a complex computer that innately processed distinct parts of the world, like facial recognition, recognizing human emotions, and problem-solving. [11] On this view, much modern human psychological activity is rooted in adaptations that occurred earlier in human evolution, when natural selection was forming the modern human species.

A 2010 review by evolutionary psychologists Confer et al. suggested that domain general theories, such as for "rationality," has several problems: 1. Evolutionary theories using the idea of numerous domain-specific adaptions have produced testable predictions that have been empirically confirmed; the theory of domain-general rational thought has produced no such predictions or confirmations. 2. The rapidity of responses such as jealousy due to infidelity indicates a domain-specific dedicated module rather than a general, deliberate, rational calculation of consequences. 3. Reactions may occur instinctively (consistent with innate knowledge) even if a person has not learned such knowledge. One example being that in the ancestral environment it is unlikely that males during development learn that infidelity (usually secret) may cause paternal uncertainty (from observing the phenotypes of children born many months later and making a statistical conclusion from the phenotype dissimilarity to the cuckolded fathers). [12] With respect to general purpose problem solvers, Barkow, Cosmides, and Tooby (1992) have suggested in The Adapted Mind: Evolutionary Psychology and The Generation of Culture that a purely general problem solving mechanism is impossible to build due to the frame problem. Clune et al. (2013) have argued that computer simulations of the evolution of neural nets suggest that modularity evolves because, compared to non-modular networks, connection costs are lower. [13]

Several groups of critics, including psychologists working within evolutionary frameworks, [14] argue that the massively modular theory of mind does little to explain adaptive psychological traits. Proponents of other models of the mind argue that the computational theory of mind is no better at explaining human behavior than a theory with mind entirely a product of the environment. Even within evolutionary psychology there is discussion about the degree of modularity, either as a few generalist modules or as many highly specific modules. [14] [15] Other critics suggest that there is little empirical support in favor of the domain-specific theory beyond performance on the Wason selection task, a task critics state is too limited in scope to test all relevant aspects of reasoning. [16] [17] Moreover, critics argue that Cosmides and Tooby's conclusions contain several inferential errors and that the authors use untested evolutionary assumptions to eliminate rival reasoning theories. [16] [18]

Criticisms of the notion of modular minds from genetics include that it would take too much genetic information to form innate modularity of mind, the limits to the possible amount of functional genetic information being imposed by the number of mutations per generation that led to the prediction that only a small part of the human genome can be functional in an information-carrying way if an impossibly high rate of lethal mutations is to be avoided, and that selection against lethal mutations would have stopped and reversed any increase in the amount of functional DNA long before it reached the amount that would be required for modularity of mind. It is argued that proponents of the theory of mind conflate this with the straw man argument of assuming no function in any non-protein-coding DNA when pointing at discoveries of some parts of non-coding DNA having regulatory functions, while the actual argument of limited amount of functional DNA does acknowledge that some parts of non-coding DNA can have functions but putting bounds on the total amount of information-bearing genetic material regardless of whether or not it codes for proteins, in agreement with the discoveries of regulatory functions of non-coding DNA extending only to parts of it and not be generalized to all DNA that does not code for proteins. The maximum amount of information-carrying heredity is argued to be too small to form modular brains. [19]

Wallace (2010) observes that the evolutionary psychologists' definition of "mind" has been heavily influenced by cognitivism and/or information processing definitions of the mind. [20] Critics point out that these assumptions underlying evolutionary psychologists' hypotheses are controversial and have been contested by some psychologists, philosophers, and neuroscientists. For example, Jaak Panksepp, an affective neuroscientist, point to the "remarkable degree of neocortical plasticity within the human brain, especially during development" and states that "the developmental interactions among ancient special-purpose circuits and more recent general-purpose brain mechanisms can generate many of the "modularized" human abilities that evolutionary psychology has entertained." [14]

Philosopher David Buller agrees with the general argument that the human mind has evolved over time but disagrees with the specific claims evolutionary psychologists make. He has argued that the contention that the mind consists of thousands of modules, including sexually dimorphic jealousy and parental investment modules, are unsupported by the available empirical evidence. [21] He has suggested that the "modules" result from the brain's developmental plasticity and that they are adaptive responses to local conditions, not past evolutionary environments. [22] However, Buller has also stated that even if massive modularity is false this does not necessarily have broad implications for evolutionary psychology. Evolution may create innate motives even without innate knowledge. [23]

In contrast to modular mental structure, some theories posit domain-general processing, in which mental activity is distributed across the brain and cannot be decomposed, even abstractly, into independent units. A staunch defender of this view is William Uttal, who argues in The New Phrenology (2003) that there are serious philosophical, theoretical, and methodological problems with the entire enterprise of trying to localise cognitive processes in the brain. [24] Part of this argument is that a successful taxonomy of mental processes has yet to be developed.

Merlin Donald argues that over evolutionary time the mind has gained adaptive advantage from being a general problem solver. [25] The mind, as described by Donald, includes module-like "central" mechanisms, in addition to more recently evolved "domain-general" mechanisms.

See also

Related Research Articles

Evolutionary psychology is a theoretical approach in psychology that examines cognition and behavior from a modern evolutionary perspective. It seeks to identify human psychological adaptations with regards to the ancestral problems they evolved to solve. In this framework, psychological traits and mechanisms are either functional products of natural and sexual selection or non-adaptive by-products of other adaptive traits.

<span class="mw-page-title-main">Jerry Fodor</span> American philosopher (1935–2017)

Jerry Alan Fodor was an American philosopher and the author of many crucial works in the fields of philosophy of mind and cognitive science. His writings in these fields laid the groundwork for the modularity of mind and the language of thought hypotheses, and he is recognized as having had "an enormous influence on virtually every portion of the philosophy of mind literature since 1960." At the time of his death in 2017, he held the position of State of New Jersey Professor of Philosophy, Emeritus, at Rutgers University, and had taught previously at the City University of New York Graduate Center and MIT.

<span class="mw-page-title-main">Wason selection task</span> Test in the study of deductive reasoning

The Wason selection task is a logic puzzle devised by Peter Cathcart Wason in 1966. It is one of the most famous tasks in the study of deductive reasoning. An example of the puzzle is:

You are shown a set of four cards placed on a table, each of which has a number on one side and a color on the other. The visible faces of the cards show 3, 8, blue and red. Which card(s) must you turn over in order to test that if a card shows an even number on one face, then its opposite face is blue?

<i>How the Mind Works</i> 1997 book by Steven Pinker

How the Mind Works is a 1997 book by the Canadian-American cognitive psychologist Steven Pinker, in which the author attempts to explain some of the human mind's poorly understood functions and quirks in evolutionary terms. Drawing heavily on the paradigm of evolutionary psychology articulated by John Tooby and Leda Cosmides, Pinker covers subjects such as vision, emotion, feminism, and "the meaning of life". He argues for both a computational theory of mind and a neo-Darwinist, adaptationist approach to evolution, all of which he sees as the central components of evolutionary psychology. He criticizes difference feminism because he believes scientific research has shown that women and men differ little or not at all in their moral reasoning. The book was a Pulitzer Prize Finalist.

The language module or language faculty is a hypothetical structure in the human brain which is thought to contain innate capacities for language, originally posited by Noam Chomsky. There is ongoing research into brain modularity in the fields of cognitive science and neuroscience, although the current idea is much weaker than what was proposed by Chomsky and Jerry Fodor in the 1980s. In today's terminology, 'modularity' refers to specialisation: language processing is specialised in the brain to the extent that it occurs partially in different areas than other types of information processing such as visual input. The current view is, then, that language is neither compartmentalised nor based on general principles of processing. It is modular to the extent that it constitutes a specific cognitive skill or area in cognition.

The term standard social science model (SSSM) was first introduced by John Tooby and Leda Cosmides in the 1992 edited volume The Adapted Mind. They used SSSM as a reference to social science philosophies related to the blank slate, relativism, social constructionism, and cultural determinism. They argue that those philosophies, capsulized within SSSM, formed the dominant theoretical paradigm in the development of the social sciences during the 20th century. According to their proposed SSSM paradigm, the mind is a general-purpose cognitive device shaped almost entirely by culture.

Cognitive specialization suggests that certain behaviors, often in the domain of social communication, are passed on to offspring and refined to be maximally beneficial by the process of natural selection. Specializations serve an adaptive purpose for an organism by allowing the organism to be better suited for its habitat. Over time, specializations often become essential to the species' continued survival. Cognitive specialization in humans has been thought to underlie the acquisition, development, and evolution of language, theory of mind, and specific social skills such as trust and reciprocity. These specializations are considered to be critical to the survival of the species, even though there are successful individuals who lack certain specializations, including those diagnosed with autism spectrum disorder or who lack language abilities. Cognitive specialization is also believed to underlie adaptive behaviors such as self-awareness, navigation, and problem solving skills in several animal species such as chimpanzees and bottlenose dolphins.

Evolutionary developmental psychology (EDP) is a research paradigm that applies the basic principles of evolution by natural selection, to understand the development of human behavior and cognition. It involves the study of both the genetic and environmental mechanisms that underlie the development of social and cognitive competencies, as well as the epigenetic processes that adapt these competencies to local conditions.

<i>The Adapted Mind</i> 1992 book by Jerome H. Barkow, Leda Cosmides, and John Tooby

The Adapted Mind: Evolutionary Psychology and the Generation of Culture is a 1992 book edited by the anthropologists Jerome H. Barkow and John Tooby and the psychologist Leda Cosmides. First published by Oxford University Press, it is widely considered the foundational text of evolutionary psychology (EP), and outlines Cosmides and Tooby's integration of concepts from evolutionary biology and cognitive psychology, as well as many other concepts that would become important in adaptationist research.

Evolutionary educational psychology is the study of the relation between inherent folk knowledge and abilities and accompanying inferential and attributional biases as these influence academic learning in evolutionarily novel cultural contexts, such as schools and the industrial workplace. The fundamental premises and principles of this discipline are presented below.

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Domain specificity is a theoretical position in cognitive science that argues that many aspects of cognition are supported by specialized, presumably evolutionarily specified, learning devices. The position is a close relative of modularity of mind, but is considered more general in that it does not necessarily entail all the assumptions of Fodorian modularity. Instead, it is properly described as a variant of psychological nativism. Other cognitive scientists also hold the mind to be modular, without the modules necessarily possessing the characteristics of Fodorian modularity.

Evolutionary psychology seeks to identify and understand human psychological traits that have evolved in much the same way as biological traits, through adaptation to environmental cues. Furthermore, it tends toward viewing the vast majority of psychological traits, certainly the most important ones, as the result of past adaptions, which has generated significant controversy and criticism from competing fields. These criticisms include disputes about the testability of evolutionary hypotheses, cognitive assumptions such as massive modularity, vagueness stemming from assumptions about the environment that leads to evolutionary adaptation, the importance of non-genetic and non-adaptive explanations, as well as political and ethical issues in the field itself.

A cognitive module in cognitive psychology is a specialized tool or sub-unit that can be used by other parts to resolve cognitive tasks. It is used in theories of the modularity of mind and the closely related society of mind theory and was developed by Jerry Fodor. It became better known throughout cognitive psychology by means of his book, The Modularity of Mind (1983). The nine aspects he lists that make up a mental module are domain specificity, mandatory operation, limited central accessibility, fast processing, informational encapsulation, "shallow" outputs, fixed neural architecture, characteristic and specific breakdown patterns, and characteristic ontogenetic pace and sequencing. Not all of these are necessary for the unit to be considered a module, but they serve as general parameters.

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<span class="mw-page-title-main">Peter Carruthers (philosopher)</span> American philosopher

Peter Carruthers is a British-American philosopher and cognitive scientist working primarily in the area of philosophy of mind, though he has also made contributions to philosophy of language and ethics. He is a professor of philosophy at the University of Maryland, College Park, an associate member of Neuroscience and Cognitive Science Program, and a member of the Committee for Philosophy and the Sciences.

Domain-general learning theories of development suggest that humans are born with mechanisms in the brain that exist to support and guide learning on a broad level, regardless of the type of information being learned. Domain-general learning theories also recognize that although learning different types of new information may be processed in the same way and in the same areas of the brain, different domains also function interdependently. Because these generalized domains work together, skills developed from one learned activity may translate into benefits with skills not yet learned. Another facet of domain-general learning theories is that knowledge within domains is cumulative, and builds under these domains over time to contribute to our greater knowledge structure. Psychologists whose theories align with domain-general framework include developmental psychologist Jean Piaget, who theorized that people develop a global knowledge structure which contains cohesive, whole knowledge internalized from experience, and psychologist Charles Spearman, whose work led to a theory on the existence of a single factor accounting for all general cognitive ability.

Domain-specific learning theories of development hold that we have many independent, specialised knowledge structures (domains), rather than one cohesive knowledge structure. Thus, training in one domain may not impact another independent domain. Domain-general views instead suggest that children possess a "general developmental function" where skills are interrelated through a single cognitive system. Therefore, whereas domain-general theories would propose that acquisition of language and mathematical skill are developed by the same broad set of cognitive skills, domain-specific theories would propose that they are genetically, neurologically and computationally independent.

Epidemiology of representations, or cultural epidemiology, is a theory for explaining cultural phenomena by examining how mental representations get distributed within a population. The theory uses medical epidemiology as its chief analogy, because "...macro-phenomena such as endemic and epidemic diseases are unpacked in terms of patterns of micro-phenomena of individual pathology and inter-individual transmission". Representations transfer via so-called "cognitive causal chains" ; these representations constitute a cultural phenomenon by achieving stability of public production and mental representation within the existing ecology and psychology of a populace, the latter including properties of the human mind. Cultural epidemiologists have emphasized the significance of evolved properties, such as the existence of naïve theories, domain-specific abilities and principles of relevance.

Evolutionary psychology has traditionally focused on individual-level behaviors, determined by species-typical psychological adaptations. Considerable work, though, has been done on how these adaptations shape and, ultimately govern, culture. Tooby and Cosmides (1989) argued that the mind consists of many domain-specific psychological adaptations, some of which may constrain what cultural material is learned or taught. As opposed to a domain-general cultural acquisition program, where an individual passively receives culturally-transmitted material from the group, Tooby and Cosmides (1989), among others, argue that: "the psyche evolved to generate adaptive rather than repetitive behavior, and hence critically analyzes the behavior of those surrounding it in highly structured and patterned ways, to be used as a rich source of information out of which to construct a 'private culture' or individually tailored adaptive system; in consequence, this system may or may not mirror the behavior of others in any given respect.".

References

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