All 3 Uses

cognitive
in
The Tipping Point
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Jennings Bryant, an educational researcher at the University of Alabama, conducted a study of 120 children, comparing the performance of regular Blue's Clues watchers to watchers of other educational shows on a series of cognitive tests.†
Chpt 3 *
"Divorced people who suffer depression and complain of cognitive dysfunction may be expressing the loss of their external memory systems," he writes.†
Chpt 5
There are abrupt limits to the number of cognitive categories we can make and the number of people we can truly love and the number of acquaintances we can truly know.†
Chpt 8

Definitions:

(1) (cognitive)
relating to mental processes like thinking, learning, remembering, and understanding
(2) (meaning too rare to warrant focus)