Everett sketches a blank-slate picture of human cognition that focuses not on what is in the mind but, rather, what the mind is in-namely, culture. He draws on years of field research among the Amazonian people of the Pirahã in order to carefully scrutinize various theories of cognitive instinct, including Noam Chomsky's foundational concept of universal grammar, Freud's notions of unconscious forces, Adolf Bastian's psychic unity of mankind, and works on massive modularity by evolutionary psychologists such as Leda Cosmides, John Tooby, Jerry Fodor, and Steven Pinker. Illuminating unique characteristics of the Pirahã language, he demonstrates just how differently various cultures can make us think and how vital culture is to our cognitive flexibility. Outlining the ways culture and individual psychology operate symbiotically, he posits a Buddhist-like conception of the cultural self as a set of experiences united by various apperceptions, episodic memories, ranked values, knowledge structures, and social roles-and not, in any shape or form, biological instinct.
The result is fascinating portrait of the "dark matter of the mind," one that shows that our greatest evolutionary adaptation is adaptability itself.