Steven Pinker Quotes
It's likely that taboo words are stored in the right hemisphere of the brain. Massive left hemisphere strokes or the entire surgical removal of the left hemisphere can leave people with no articulate speech other than the ability to swear, spout cliches and song lyrics.
Citations
Pinker, Steven. The Stuff of Thought: Language as a Window into Human Nature. Viking, 2007, p. 333.
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Steven Arthur Pinker is a Canadian-American cognitive psychologist, linguist, and popular science author. He is an advocate of evolutionary psychology and the computational theory of mind.