Penny's emotional responses originate in the
PRIMITIVE portion of brain, the amygdala.
The Big Bang Theory Season 1, Episode 17
It's PRIMITIVE, no better than the hill tribes.
Game of Thrones Season 1, Episode 3
Yeah. It was PRIMITIVE.
Breaking Bad Season 5, Episode 8
Our combined skin cells are now
a PRIMITIVE neural network.
The Big Bang Theory Season 10, Episode 8