Abstract
To compare the extinction effect of latent extinction or non-response extinction, and response extinction, two experiments using a SALZMAN-type U-maze were performed.In Experiment I, the effect of latent extinction did not differ significantly from that of response extinction by free choice (Fig. 2, Table 2). Contradicting DEESE'S (1) results, a tendency to spontaneous recovery from latent extinction was found. A significant latent extinction was also found.In Experiment II, response extinction by forced choice produced significantly greater extinction than latent extinction and that tendency did not disappear even after overtraining in 50 trials (Fig. 3, Table 5).Summarizing the two experiments together with DEESE'S (1) results, it is concluded that a latent extinction effect can be induced in a U-maze, but it is inferior to a response extinction effect.
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