PSYC 2600 Lecture Notes - Lecture 10: Decision Rule, David Buss, Sympathetic Nervous System
20 Apr 2016
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Members of the species must differ (i. e. variation) Some of these variations must be to some significant degree heritable. Organisms with some heritable variants leave more offspring because those attributes help with the tasks of survival and reproduction: differential survival/reproductive success is key, assumes hostile forces of nature . An example of natural selection includes the varieties of finches. Finches have adapted over time depending on what they are available to eat (different beaks over time). In humans, natural selection has appeared as sympathetic nervous system arousal. The limbic system detects and interprets threatening stimuli, and then arouses the sympathetic nervous system. If the threshold for activation is set too low or too high this is a bad thing. Those individuals within the just right range survive and reproduce. Those features which evolved by natural selection help organisms solve some recurrent problems of adaption.
