Answer:
successive approximation
Step-by-step explanation:
It is a method of shaping behavior in which responses which are similar to the desired behavior are identified and reinforced. At first the responses, that are roughly similar to the desired behavior are reinforced. After this, only the responses that closely similar to the desired behavior are reinforced. This process eventually results in the desired behavior. This is referred to as successive approximation.
Every consecutive step towards the desired behavior is rewarded. The sequence of rewards, for different steps of the behavior increases the probability that the steps will lead to the desired behavior. The steps leading to the desired behavior should be identified chronologically complete the intended performance. The final behavior is divided into desired steps to be rewarded sequentially.
For example, a researcher may use shaping to train a rat during an experiment to press a lever. Rats are to be trained for this as they are not born with the ability to press a lever in a cage. To begin with, the researcher will reward the rat if it does some movement in the lever direction. After that to get rewarded, rat must actually take a step toward the lever. Now the rat has make more advanced move to go over the lever in order to get rewarded and this will continue unless only pressing lever generates reward. The rat won't be rewarded for doing any past behaviors. Every time a rat is rewarded for a successive approximation which leads to the desired behavior.