This is the well known anthology of seminal essays that launch evolutionary psychology in the early 90s by Cosmides, Tooby and Barkow. Evolutionary psychology explains human nature by evolved psychological mechanisms. The evolved psychological mechanisms are the product of adaptations from natural selections over evolutionary time. The evolved psychological structure is originated from adaptations of the way of life in the Pleistocene hunter-gatherer lifestyle over time and not necessarily to our modern culture. A central feature of evolutionary psychology is that it integrates evolutionary biology into psychology to explain human nature which breaks the tradition of psychological and social sciences of engaging in research within their own domain while disregarding findings in the larger network of sciences, such as evolutionary biology, cognitive science, neurobiology, social anthropology.
The anthology begins with a long essay “The Psychological Foundations of Culture” by Cosmides and Tooby which sets up evolutionary and psychological foundations of social sciences. The essay began with a criticism of Standard Social Science Model (SSSM) which is the model of approaching social sciences by engaging in research within its own discipline while ignoring development of the network of sciences just mentioned. A unique feature of SSSM is its usage of the blank slate view of human nature according to which human minds are born free of content or nature. A human shapes his psychological profile based on information he experiences in his environment. Psychology is a study of the processing of information a human acquires from his environment. SSSM’s blank state view of human nature suffers from a distinction of nature/nurture. Just because a child’s absent of mental organisation at birth does not imply some mechanisms are not already present in the structure but would emerge over time such as such as teeth and breast.
Cosmides and Toobey then explains how evolutionary biology fits into cognitive psychology by adaptations in information processing system from selection pressures operating in ancestral environment. The selection pressure respects Hamilton's rule which describes how the pressures operating on mechanisms that generate behaviours that have a reproductive impact on an organism and its kin. The rule is based on a cost-benefit calculation in actions with evolutionary advantage. The selection pressures would result in adaptations in mental computational mechanisms that govern social exchange, mate selection, parental love, language acquisition and various mental functionalities. On this approach, the adaptations are manifested in information processing system that result in behaviours. The evolved psychological architecture is a human species specific architecture that bundles up mechanisms or modules that can solve domain and content specific problems in the environment. Such modules includes social exchange module, emotion perception module, sexual attraction module, theory of mind module, grammar acquisition module etc to solve a variety of human culture problem
After Cosmides and Tooby's foundational essay, the next section is on adaptations for cooperation. Being man is a cultural and social creature, the most fundamental aspect of his psychological structure is mechanisms for social exchange and cooperation. Their essay, Cognitive Adaptations for Social Exchange is a result of 8 years of experimental research on the reasoning mechanism for social exchange. The hypothesis is that reasoning and rationality mechanisms have been developing from ancestors over million of years to cope with long standing evolutionary problems. With regard to social exchange reasoning, social exchange or reciprocal altruism reasoning on sharing of resources is based often on the cost/benefit calculation in Hamilton rule. In any agreement to share resources, the exchange may not be simultaneous. To address such temporal lapse or detect potential cheaters in cooperation, there is a cooperation rule 3 known as Tit for Tat rule: cooperate on the first move, on subsequent move, do whatever your partner did on the previous move. This social cooperation is used to see both parties are honouring the agreement. Their research also considers algorithms in social contract reasoning for social exchange. One finding is that social contract reasoning is not mere logical analysis. Another issue considered is if there is a cheater detection in social contract reasoning or people are just good at social contract reasoning. The finding from the experiments is that the algorithms governing social contract include inference procedures to detect cheaters. Those inference rules are built into cost/benefit calculation. This result suggest that human minds include cognitive procedures that are adaptations for reasoning about social contract.
The next section of the anthology is on the psychology of mating. Buss essay is on mate preference mechsnism with a research using 10000 subject cross culturally. Male and female show consistent sex differences in mate preferences across culture. Females prefer mates with resources and attributes that are correlated with resource acquisition more than males while males prefer youth and attractiveness for reproductive capacity. Research also shows tactics used in intrasexual competition to attract mates reflect the mate preferences of the opposite sex. Buss stated more research is needed on an adequate description of these psychological mechanisms. In Ellis study of female evaluative mechanism of mate selection, though a woman may not exhibit a behaviour that chooses a mate for reproductive goal, selection pressures work on psychological mechanisms to detect male traits with economic resources, ability to protect a woman from harm, ability to engage directly in parenting. These mechanisms are similar to Dawkins view that mate selection criteria are based on reproductive goals in many life forms as mentioned in The Selfish Genes.
In such an anthology, there is of course a section on adaptations in language and perception. Pinker contributed to the article on language in which he examines language shows signs of complex design for the communication of proportional structures, and the only explanation for the origin of organs with complex design is natural selections. His article covers a variety of issues such as language as a spandrel, appearance of arbitrariness of language when a code needs to be set for usage in the environment, and functional challenge of gradual changes by selection pressure of a complex language structure.
A fascinating section in the anthology is environmental aesthetics. The topic explores emotional response to aesthetics of the environment that leads to survival and reproductive value. Gordon Orians and Judith Heerwagen essay, Evolved Responses to Landscape, proposed a "Savannah hypothesis: according to which humans have evolved preferences to habitats with features characteristics of a tropical African savannah, the environment from which early homosapiens have initially evolved. The early homosapiens were accustomed to the high resource savannah environment which provided them with survival. Such experience has generated aesthetics preferences in their psychological profile to prefer savannah over other biomes. Test subjects from US, Argentina and Australia were offered photos of different biomes to include tropical forest, desert, deciduous forest. Coniferous forest and Savannah. While adults show variation of preferences, children of 8 year old cross culturally selects savannah over other biomes showing an innate predisposition over savannah. Their study also review habitat selection criteria in different stages such as habitat encounter, exploration and decision that generates aesthetics judgment. This study shows interesting psychological development of adaptations from aesthetic reaction to environment for natural selection.
There is a small section on intrapsychic processes in which Randolph Nesse and Alan Lloyd offers an essay of psychodynamic mechanism. The essays examines how a variety of concepts in psychoanalysis fits into evolutionary psychology. It shows a variety of mechanisms that are not truth conducive offers survival advantages that are suitable for the selection processes. For instance, self-deception may enhance ability to deceive others in maintaining relationships. Another issue repression which keeps unconscious thoughts and wishes from surfacing. Indignant moral wishes, hatred, unacceptable desires in custom and other negative ideation are repressed for survival advantage in relationship. Defenses, the mental process that keeps unacceptable or painful thoughts , wishes, impulses or memories from consciousness�� and thereby reduces painful affects provide mental survival advantages. What is interesting in all these processes is that adaptations maybe subject to mechanisms that are not truth conducive. Selection processes can be not truth conducive but have pressure merely for psychological survival.
This anthology offers essays in a wealth of psychological topics by experts in each field to connect evolutionary mechanism and processes to psychology. It will remain as a go to source to consult for the initial development of evolutionary psychology.