A group of research participants are placed alone in quiet cubicles where their arms are bandaged and they hear nothing but the sound of a dull, continuous hum. This method is used to study the effects of

A child fixated in the oral stage may become an adult who

eats excessively. is excessively neat. is a homosexual. has intense fears.

Most cases of dissociative identity disorder are associated with

a) brain damage. b) abuse during childhood. c) neurotransmitter imbalances. d) inherited neurological defects.