Use of which of the following substances has been implicated in the development of schizophrenia in vulnerable individuals?

A common cause of delirium among the elderly is

a. mutations of genes on chromosome 21. b. antihistamines. c. urinary tract infection. d. normal decline in fluid intelligence.

The desire to avoid stress is to ________ theory as the desire to avoid boredom is to ________ theory.

a. arousal; incentive b. instinct; drive-reduction c. incentive; instinct d. drive-reduction; arousal