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Psychology (9,697)
PSYC18H3 (275)
Chapter 2

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Michelle Hilscher

Elements of an evolutionary approach to emotionsThe engine that drives evolution has three partsSuperabundance animals and plants produce more offspring that necessary merely to reproduce themselvesVariation each offspring is somewhat different than others and differences are passed on by heredityNatural selection characteristics that allow the individual to be adapted to the environment are selected forAt the core of natural selection are selection pressuresSome selection pressures involves threats or opportunities related to physical survivalIntrasexual competitionoccurs within a sex for access to mateThose traits whether it be strength beauty cunning emotional intelligence or humor that allow some to prevail over other are more likely to be passed on to succeeding generationsIntersexual competitionrefers to the process by which one sex selects specific kinds of traits in the other sexSocial status affects the amount of resources one has and more resources will benefit future offspring Men preference for youth and beauty because many of the cues of youth and beauty are physical signs of optimal reproductive ageRecently evolutionary theorists have proposed that our capacity to cooperate is a powerful determinant of who reproduces and who survives We reproduce raise offspring avoid predation gather food and stay warm in relationships with other peopleAdaptationsare genetically based traits that allows the organism to respondwell to specific selection pressures and to survive and reproduceWomen are particular sensitive to bitter taste and smells during first trimester of pregnancyOverwhelms the many costs of raising children and increases the chances that genes will be passed from one generation to the next not all human trait or behaviors are adaptations snoring nervous leg jiggles serve no apparent evolutionary function and are better thoughts of as byproducts Evolution is a tinkerer and often endows old anatomical and behavioral features with new functions A trait that acquires a new function like this is called an exaptation
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