We conducted an experiment to examine the effect of tact (including Japanese ending particles) training with conditional discrimination. The target behavior was to tact with the appropriate ending particles to the listeners according to two conditions. That is, when a subject shared past information with a listener, he should add "NE", and when he did not, he should add "YO" at the end of the tact. In the intensive training, the subject was trained with "a tact training board" that included pictures of the persons and the letter cards of ending particles. He used these two particles properly, and generalization of the target was evaluated with the different items, the different listeners, and his daily life. The results indicated that he had acquired tact with the ending particles through the intensive training. The target was generalized and another topography, "DESYO" , which has the similar funcion as "NE" was observed in his home. In his daily life, "NE" and "YO" occurred when refering to present and future information, although "NE" and "YO" were trained in the training session refering to past information. It is suggested that the ending particles were differentiated by the formation of the responses to visual stimuli , and the verbal responses according to the conditions were emitted.
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