Operant conditioning is similar to the principle of natural selection in that an individual's behaviors that are _____ tend to increase in frequency, while behaviors that are _______ tend to decrease in frequency.

In humans, phobias and panic disorders are examples of __________ pairings of the

classical procedure.

Five-month-old Raelle can be expected to __________ when an object is moved beyond her reach

A) extend one arm rather than both B) reduce her efforts C) revert to prereaching D) increase her efforts