Biophysics

Handbook of Psychology, Biological Psychology by Michela Gallagher, Randy J. Nelson, Irving B. Weiner

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By Michela Gallagher, Randy J. Nelson, Irving B. Weiner

Contains proven theories and state of the art developments.Presents the paintings of a world team of experts.Presents the character, beginning, implications, an destiny process significant unresolved matters within the sector.

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Selection favors males in these species who compete successfully with other males or who have qualities preferred by females that increase their mating opportunities. Conversely, selection favors females who choose mates who have good genes and (in paternally investing species) are likely to provide external resources such as food or protection to the female and her offspring (Trivers, 1972). Parental investment theory, in combination with the metatheoretical assumptions of natural and sexual selection, generates an array of hypotheses and specific predictions about sex differences in mating and parental behavior.

Under these conditions, selection should favor psychological mechanisms in females that are especially attuned to variation in potential for paternal investment. , Buss, 1989; Ellis, 1992; Symons, 1979). These studies have typically investigated such indicators as high status, resourceaccruing potential, and dispositions toward commitment and cooperation. The other side of the coin is that men who invest substantially in offspring at the expense of future mating opportunities should also be choosy about selecting mates.

Female orgasm is an adaptation that motivates females to seek multiple sexual partners, confusing males about paternity and thus reducing the probability of subsequent male infanticide (Hrdy, 1981). • Female orgasm is an adaptation that serves to enhance sperm retention, therefore allowing females to exert some control over the paternity of their offspring via differential patterns of orgasm with specific male partners, especially those of high genetic quality (Baker & Bellis, 1993; Smith, 1984).

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