Test #2 Flashcards
Environment of Evolutionary Adaptivenesss (EEA)
Environment wherein natural selection designed our ancestors to deal with challenges around 200, 000 years ago. Ergo, small hunter-gatherer societies.
Young men & aggression
Men in particular seem to have mechanisms for aggression: these are activated when certain cues are present in certain contexts. According to ev. psych, this functions to: restore status, gain access to mates, and deter poachers.
Environment of evolutionary adaptiveness (EEA)
Environment wherein our ancestors were designed to deal with challenges (eg; predators, natural disasters) 200, 000 years ago. Ergo, small hunter-gatherer societies.
Sympathetic Nervous System as an example of natural selection
Limbic system detects and interprets threatening stimuli, and then activates SNS. If the threshold is too low, then the individual is constantly anxious and may be too anxious to forage/hunt, consequently starving. If the threshold is too high, then only extreme threats are detected and the SNS only activates too late.
Sexual selection
Hostile forms of nature are not the only impetus for evolution; passing genes requires reproduction. Some heritable characteristics have selective mating benefits.
Intrasexual competition
Members of the same sex compete for mating access. Winners’ genes are passed on.
Sexual dimorphism hypothesis
When sex differs in Minimum Parental Investment (MPI), then one sex sires more offspring than another.
Intersexual selection
If members have a consensus on what is attractive (traits), then those with said trait with be preferably chosen.
Genetic drift
Random change in makeup of a population.
Founder effect
Small, unrepresentative population establishes a new colony
Genetic bottleneck
Population shrinks due to a catastrophe
3 products of evolution
Adaptations, byproducts, and noise
Adaptations
Exist due to natural/sexual selection allowing carriers to survive and reproduce. Beneficial.
By-products
Do not solve any problem or have functional design.
Noise
Random effects.
Limits of evolutionary approach
It’s impossible to go back in time to the EEA, we don’t know as much as we’d like to about the environment, and today’s environment is actually quite different.
Buss et al. (1999)
Men find partner having sex with other worse than women, who find partner having an emotional connection with other worse.