Evolutionary perspective natural selection and adaptive

Other Referenced Works 1. It gained wide attention in with the publication of the landmark volume The Adapted Mind by Jerome Barkow, Leda Cosmides and John Tooby, and since then numerous textbooks for example, Buss and popular presentations for example, Pinker; Wright have appeared.

Evolutionary perspective natural selection and adaptive

Organismic trait designed to solve an ancestral problem s. Shows complexity, special "design", functionality Adaptation that has been "re-purposed" to solve a different adaptive problem.

Williams suggested that an "adaptation is a special and onerous concept that should only be used where it is really necessary. Obligate and facultative adaptations[ edit ] A question that may be asked about an adaptation is whether it is generally obligate relatively robust in the face of typical environmental variation or facultative sensitive to typical environmental variation.

By contrast, facultative adaptations are somewhat like "if-then" statements. For example, adult attachment style seems particularly sensitive to early childhood experiences. As adults, the propensity to develop close, trusting bonds with others is dependent on whether early childhood caregivers could be trusted to provide reliable assistance and attention.

The adaptation for skin to tan is conditional to exposure to sunlight; this is an example of another facultative adaptation.

Difference Between Natural Selection and Adaptation

When a psychological adaptation is facultative, evolutionary psychologists concern themselves with how developmental and environmental inputs influence the expression of the adaptation. Cultural universal Evolutionary psychologists hold that behaviors or traits that occur universally in all cultures are good candidates for evolutionary adaptations.

Basic gender differences, such as greater eagerness for sex among men and greater coyness among women, [36] are explained as sexually dimorphic psychological adaptations that reflect the different reproductive strategies of males and females. Human evolution Evolutionary psychology argues that to properly understand the functions of the brain, one must understand the properties of the environment in which the brain evolved.

Evolutionary perspective natural selection and adaptive

That environment is often referred to as the "environment of evolutionary adaptedness". More specifically, the environment of evolutionary adaptedness is defined as the set of historically recurring selection pressures that formed a given adaptation, as well as those aspects of the environment that were necessary for the proper development and functioning of the adaptation.

Humans, comprising the genus Homoappeared between 1. Because the Pleistocene ended a mere 12, years ago, most human adaptations either newly evolved during the Pleistocene, or were maintained by stabilizing selection during the Pleistocene.

Evolutionary psychology therefore proposes that the majority of human psychological mechanisms are adapted to reproductive problems frequently encountered in Pleistocene environments. The environment of evolutionary adaptedness is significantly different from modern society.

Because humans are mostly adapted to Pleistocene environments, psychological mechanisms sometimes exhibit "mismatches" to the modern environment.

One example is the fact that although about 10, people are killed with guns in the US annually, [44] whereas spiders and snakes kill only a handful, people nonetheless learn to fear spiders and snakes about as easily as they do a pointed gun, and more easily than an unpointed gun, rabbits or flowers.

The term was coined by Niko Tinbergen to refer to non-human animal behavior, but psychologist Deirdre Barrett said that supernormal stimulation governs the behavior of humans as powerfully as that of other animals.

She explained junk food as an exaggerated stimulus to cravings for salt, sugar, and fats, [48] and she says that television is an exaggeration of social cues of laughter, smiling faces and attention-grabbing action.

SparkNotes: Evolution and Genes: Evolutionary Psychology

The human mind still responds to personalized, charismatic leadership primarily in the context of informal, egalitarian settings. Hence the dissatisfaction and alienation that many employees experience. Salaries, bonuses and other privileges exploit instincts for relative status, which attract particularly males to senior executive positions.

One of the major goals of adaptationist research is to identify which organismic traits are likely to be adaptations, and which are byproducts or random variations.A prerequisite for natural selection to result in adaptive evolution, novel traits and speciation is the presence of heritable genetic variation that results in fitness differences.

Evolutionary perspective natural selection and adaptive

The social implications of the theory of evolution by natural selection also became the source of continuing controversy.

Ever since Charles Darwin (/) proposed his theory of evolution by natural selection, evolutionary biologists quite successfully offer adaptationist explanations of physiological features of living things that explain the presence of a trait by claiming that it is an adaptation, that is, a trait current organisms possess because it.

Evolutionary psychology is a theoretical approach in the social and natural sciences that examines psychological structure from a modern evolutionary perspective. It seeks to identify which human psychological traits are evolved adaptations – that is, the functional products of natural selection or sexual selection in human evolution.

So far in today's lecture we have emphasized that natural selection is the cornerstone of evolutionary theory. It provides the mechanism for adaptive change. Any change in the environment (such as a change in the background color of the tree trunk that you roost on) is likely to lead to local adaptation.

Nov 18,  · Adaptive changes groomed by natural selection might indeed sculpt a fin into a primitive foot, they said, but those changes make only a small contribution to the evolutionary process, in which the composition of DNA varies most often without any real consequences.

2 days ago · Adaptive changes groomed by natural selection might indeed sculpt a fin into a primitive foot, they said, but those changes make only a small contribution to the evolutionary process, in .

SparkNotes: Evolution and Genes: Evolutionary Psychology