In addition, large-scale climate events like El Nino and La Nina redistribute vast water masses among Earth's ocean, atmosphere and land. Scientists care because, to put movements of Earth's crust into proper context, they need a frame of reference to evaluate them against.
Adj. 1. operant-having influence or producing an effect; many emotional determinants at work; an operant conscience. operative-being in force or having or exerting force; operative regulations; the major tendencies operative in the American political system. 1  Facebook.
While operant and classical conditioning both involve the presence of environmental stimuli, they differ in nature. In operant conditioning, stimuli present when a behavior is rewarded or punished come to control that behavior. For example, a child may learn to open a box to get the candy inside, or learn to avoid touching a hot stove; the box and the stove are discriminative stimuli.