“…Since Razran's study, many investigations have observed semantic generalization across a wide range of stimuli and responses (for reviews of this work, see Cofer & Foley, 1942;Creelman, 1966;Feather, 1965). Peastrel, Wishner, and Kaplan (1968), though, showed that generalization was greatest to synonyms when subjects were set to process meaning during conditioning and was greatest to homophones when subjects were set to process acoustic properties of the conditioned stimulus, and no clear difference between synonyms and homophones emerged when the set was ambiguous. Finally, two studies have found generalization to antonyms, as well as to synonyms, but there were no significant differences in the effects of these two kinds of meaning (Korn, 1966;Lerner, 1968).…”