The difference between Lizard brain and Reptilian brain
When used as nouns, lizard brain means the most primitive part of the brain, whereas reptilian brain means the primitive part of the human brain that mirrors that of reptiles, controlling instinctive behavior.
check bellow for the other definitions of Lizard brain and Reptilian brain
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Lizard brain as a noun:
The most primitive part of the brain; the brain stem.
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Lizard brain as a noun (by extension):
Any part of a person's psyche or personality dominated by instinct or impulse rather than rational thought.
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Reptilian brain as a noun:
The primitive part of the human brain that mirrors that of reptiles, controlling instinctive behavior.