The hypothalamus is one of ...

The hypothalamus is one of the most important parts of the brain, involved in many kinds of motivation, among other functions.  The hypothalamus controls the \
The hypothalamus is one of the most important parts of the brain, involved in many kinds of motivation, among other functions. The hypothalamus controls the "Four F's": fighting, fleeing, feeding, and mating.
 Marvin Dunnette

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Effort only fully releases its reward after a person refuses to quit.
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