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The speed of a lever-pulling response was measured for 48 kindergarten children under different conditions of delay of reinforcement and incentive value. Ss were divided into 6 groups depending upon 3 delayed reinforcements (Immediate, 5-sec and 10-sec Delay) and 2 incentive values (High and Low). On each trial, measures of starting and movement time of a leverpulling response were taken. The starting speeds were inversely related to the delay of reinforcement. For the movement speeds, Ss of the immediate reinforcement groups responded faster than those of the delayed reinforcement groups. The incentive value variable did not, however, affect both speeds. The data were interpreted in terms of the competing response hypothesis.

LEVER-PULLING RESPONSE SPEED IN CHILDREN AS A FUNCTION OF DELAY OF REINFORCEMENT AND INCENTIVE VALUE