VS whole picture
when you think categorically, you have trouble seeing how similar or different two things are. If you pay lots of attention to where boundaries are, you pay less attention to complete pictures.
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They are the same thing or intertwined as Entangled Causation
by the time you finish this book, you’ll see that it actually makes no sense to distinguish between aspects of a behavior that are “biological” and those that would be described as, say, “psychological” or “cultural.” Utterly intertwined.
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There is little doubt that the monkey’s mood is set by its high serotonin levels. If you artificially reverse the pecking order so that the monkey is now a subordinate, not only does its serotonin drop, but its behaviour changes, too.
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Wiser division
You don’t want to cling to the disciplinary divisions that strike you as somewhat arbitrary. Because evolution by selection is the only known process that is capable of generating complex functional organic design, evolutionary psychology appears to be the only viable metatheory that is powerful enough to integrate all these subdisciplines.
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Studying human psychology through adaptive problems and their solutions—the organizing principle of this book—provides a more natural means of “cleaving nature at its joints” and hence crossing current disciplinary boundaries and unifying the field of psychology.
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Anatomy based on functions/systems, not quadrants