A(n) _______________ allows a researcher to control and manipulate the situation being studied

Clinicians who view personality disorders as extremes of normal personality rather than as ____ have criticized the way DSM-IV-TR classifies personality disorders.

(a) medical conditions (b) biologically based traits (c) separate categories of disorders (d) impaired functioning

All other things being equal, an animal trained on which of the following schedules of reinforcement should experience extinction most quickly when the reinforcement is removed?

a. Fixed-interval schedule b. Continuous schedule c. Variable-ratio schedule d. Variable-interval schedule