Wundt’s principle of ____ states that prolonged experiences of one type cause one to seek the opposite type of experience.

The criterion of verifiability requires that the theorist specify observations which would refute the

prediction. Indicate whether the statement is true or false.

A rat will press a response bar hundreds of times if bar pressing results in the administration of cocaine. Apparently, the pleasurable and reinforcing aspects of the drug are due to cocaine's effect on:

a. dopamine b. endorphins c. serotonin d. GABA