Psychological adaptation

A psychological adaptation is a functional, cognitive or behavioral trait that benefits an organism in its environment. Psychological adaptations fall under the scope of evolved psychological mechanisms (EPMs), however, EPMs refer to a less restricted set. Psychological adaptations include only the functional traits that increase the fitness of an organism, while EPMs refer to any psychological mechanism that developed through the processes of evolution. These additional EPMs are the by-product traits of a species’ evolutionary development (see spandrels), as well as the vestigial traits that no longer benefit the species’ fitness. It can be difficult to tell whether a trait is vestigial or not, so some literature is more lenient and refers to vestigial traits as adaptations, even though they may no longer have adaptive functionality. For example, xenophobic attitudes and behaviors appear to have certain EPM influences relating to disease aversion, however, in certain environments these behaviors may actually have a poor effect on a person's fitness. The principles of psychological adaptation rely on Darwin's theory of evolution and are important to the fields of evolutionary psychology, biology, and cognitive science. A psychological adaptation is a functional, cognitive or behavioral trait that benefits an organism in its environment. Psychological adaptations fall under the scope of evolved psychological mechanisms (EPMs), however, EPMs refer to a less restricted set. Psychological adaptations include only the functional traits that increase the fitness of an organism, while EPMs refer to any psychological mechanism that developed through the processes of evolution. These additional EPMs are the by-product traits of a species’ evolutionary development (see spandrels), as well as the vestigial traits that no longer benefit the species’ fitness. It can be difficult to tell whether a trait is vestigial or not, so some literature is more lenient and refers to vestigial traits as adaptations, even though they may no longer have adaptive functionality. For example, xenophobic attitudes and behaviors appear to have certain EPM influences relating to disease aversion, however, in certain environments these behaviors may actually have a poor effect on a person's fitness. The principles of psychological adaptation rely on Darwin's theory of evolution and are important to the fields of evolutionary psychology, biology, and cognitive science. Charles Darwin proposed his theory of evolution in On the Origin of Species (1859). His theory dictates that adaptations are traits that arise from the selective pressures a species faces in its environment. Adaptations must benefit either an organism's chance of survival or reproduction to be considered adaptive, and are then passed down to the next generation through this process of natural selection. Psychological adaptions are those adaptive traits that we consider cognitive or behavioral. These can include conscious social strategies, subconscious emotional responses (guilt, fear, etc.), or the most innate instincts. Evolutionary psychologists consider a number of factors in what determines a psychological adaptation, such as functionality, complexity, efficiency, and universality. The Adapted Mind is considered a foundational text on evolutionary psychology, further integrating Darwinian theory into modern psychology. An area of disagreement arises between evolutionary psychologists, cognitive scientists and behaviourists on where to draw the line on what is considered a psychological adaptation, and what is considered a learned behaviour. Where behaviourism explains certain behaviours as conditioned responses, cognitivism may push that these behaviours arise from a psychological adaptation that institutes a preference for that behaviour. Evolutionary psychology proposes that the human psychology consists primarily of psychological adaptations, which is opposed by the tabula rasa or blank slate model of human psychology. Early behaviourists, like B.F. Skinner, tended to the blank slate model and argued that innate behaviors and instincts were few, some behaviourists suggesting that the only innate behavior was the ability to learn. On the other hand, Steven Pinker presents the cognitivist perspective in his book, The Blank Slate, in which he challenges the tabula rasa models and argues that human behaviour is shaped by psychological adaptations. This difference in theory can be seen in research on modern human sexual preferences, with behaviourists arguing that attraction has conditioning influences, such as from the media or cultural norms, while others arguing it is based on psychological adaptations. However, sexual preferences are a difficult subject to test due to the amount of variance and flexibility exhibited in human mate choice. A hybrid resolution to psychological adaptations and learned behaviours refers to an adaptation as the species’ capacity for a certain behavior, while each individual organism still needs to be conditioned to exhibit that behaviour. This approach can explain language acquisition in relation to linguist and cognitive scientist Noam Chomsky's model of human language. His model supports that the capacity for language is a psychological adaptation (involving both the language necessary brain structures and disposition for language acquisition), however, children lack any particular instantiation of language at birth, and must instead learn one in the their environment. The mating strategies of both sexes can be simplified into different psychological adaptations. There is extensive evidence that incest avoidance, which is the tendency to avoid sexual intercourse with close relatives is an evolved behavioural adaptation. Incest avoidance can be seen cross-culturally in humans, and is evident in wild animals. Evolutionary psychologists argue that incest avoidance adapted due to the greater chance of producing children with severe disabilities when mating with relatives, and because genetic variability offers an increase in fitness regarding offspring survival. Sexual jealousy is another behavior observed in human and non-human animals that appears to be instinctual. Heuristic problem solving and consistent preference for behavioral patterns are considered by some evolutionary psychologists to be psychological adaptations. For example, the tendency for females to change their sexual strategies when faced with developmental pressures such as an absent father may be the result of a psychological adaptation. Human males have developed psychological adaptations, which make them attractive to the opposite sex in order to increase their reproductive success. Evolutionarily, it pays for a male to be polygynous – to have a number of female partners at once – because it means he can create more offspring at once, as they don't have to invest any time in carrying a foetus. Examples of some of these other adaptations include strategies to entice females, strategies to retain a partner and the desire for short-term relationships. It has been researched that humour is sexually selected and acts as a fitness indicator. The production of humour increases mate value in men, and so women seek males with a good sense of humour. In turn, males have developed an adaptation in which they produce humour to attract women. Human males have developed an adaptation in which they find women more attractive if they show cues of fertility, such as a good waist–hip ratio. Women with a waist-to-hip ratio of 0.7 are considered more attractive to males than those with a ratio of 0.8, who are considered to have a more masculine figure. This is because they are perceived to be able to have children more and to be more fertile and healthy. Males have developed behaviours that help them to retain a mate, also known as mate guarding, in order to enhance reproductive success in long-term relationships. Examples are intersexual manipulations which involves the male manipulating the way his partner views their current relationship and to repulse her from other relationships. He could do this by enhancing his own value or decreasing the value of other males. In extreme cases, some men have developed intersexual adaptations that restrict their partner from interacting with other males, including the use of violence. By doing this, women are less likely to stray from her current relationship, even if it is due to fear. On the other hand, intrasexual manipulations are used to reduce any other options for the females, which could include decreasing their partner's value or make it clear to other males that the female is 'theirs' by using possessive techniques such as holding her hand in public.