In a previous paper (i), the writers presented a theoretical account of the conditioned response mechanism of mediated generalization, and suggested that many phenomena of verbal behavior might be understood in terms of mediated as well as non-mediated generalization. The present paper reports an investigation designed to determine whether some of the suggested theoretical relationships may be demonstrated experimentally.In the above-mentioned report, it was pointed out that if generalization effects should operate as described, they might occur along any of several different dimensions. Thus, if a given word be reinforced, we should expect generalization effects to appear in its synonyms, homophones (i, Figs. 2 and 3), antonyms, and other classes of words which the subject has learned to associate with it in some way.
2The present investigation is limited to certain synonym and homophone relationships. The study was designed specifically to discover whether generalization may be demonstrated to occur to (1) more than one homophone of a reinforced word, (2) a synonym of the reinforced word, and (3) a synonym of a synonym of the reinforced word which is not, however, itself a synonym (or other semantic relative) of the reinforced word. The first two problems involve generalization to stimuli directly related semantically or homophonically to the reinforced word, whereas the third problem involves semantic generalization to a stimulus only indirectly related to the reinforced wordtwo transformations removed from the original reinforced word, cf. (1).The writers have previously (1) summarized the experiments directly concerned with generalization along synonym and homophone gradients. To our knowledge, all of these experiments have been limited to the demonstration of such generalization along a single synonym or homophone gradient from a given word, the synonym 1 The present paper represents part of a research project being conducted by the writers under a grant-in-aid from the American Association for the Advancement of Science.* For a list of certain of these possible gradients along which mediated generalization might be expected to occur, cf. (i).168