Definitions from Wiktionary (lizard brain)

▸ noun:  (anatomy, psychology) The most primitive part of the brain; the brain stem.
▸ noun:  (by extension) Any part of a person's psyche or personality dominated by instinct or impulse rather than rational thought.
▸ noun:  (by extension) Any part of a person's mind concerned with automatic, repetitive tasks rather than emotion.


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