The nature of stimulus control acquired through various types of differential classical conditioning of the nictitating membrane response was investigated. The principal findings were (a) intra-and interdimensional differential training resulted in sharper stimulus control than did singlestimulus training; (6) nondifferential training with two CSs led to a generalization gradient with the peak being displaced from CS+ to one of the test stimuli lying between the two CSs; and (c) differential training with stimuli varying simultaneously along the audio-frequency and intensity dimensions resulted in two reliable generalization gradients, one for each dimension.
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