For each emotion, its circuitry creates a readiness for a set of species-characteristic brain processes and behaviors, appropriate to the event that triggered them. It is in these processes that the experience of a particular emotion arises, and the experience—of happiness, anger, fear, and so on—is something we share with other animals. We shall encounter some support for this early theorizing, and some important modifications, most notably that the experience of emotion engages many different areas of the brain, both subcortical (i.e., limbic) and cortical.
Maclean - Panksepp conjecture
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