抄録
To determine the inhibitory effect of negative stimulus in discrimination learning, 91 preschool children were trained on shape discrimination. 4 groups received differential amounts of training in original learning. The effects were evaluated in terms of performance during reversal in which a new negative stimulus was introduced. A nonmonotonic function of the degree of original learning was found: the latency on the first reversal trial was longer for Ss with no original learning and for those oveftrained, while it was shorter for those with intermediate degrees of original learning.
