“…Since A. R. Mattocks (cited in Underwood & Schulz, 1960) observed that college students often select only the first letter of nonsense trigrams for use as their effective stimuli in paired-associate (PA) learning, the "redundant-trigram" model of PA learning has enjoyed great popularity in investigations of the process of stimulus selection (e.g., for adult Ss, Berry, Detterman, & Mulhern, 1973;Davis, Brown, & Ritchie, 1968;Lovelace & Blass, 1968;Lovelace & Greenberg, 1969;Postman & Greenbloom, 1967;Rabinowitz & Witte, 1967: Richardson, 1972, and for child and/or retarded Ss, Baumeister & Berry, 1970;Berry & Baumeister, 1973: Berry, Joubert, & Baumeister, 1971Rabinowitz & McClinton, 1971). It is pOSSible, however, that the redundant-trigram research model is not as useful as an analogous model based on triads of unrelated words.…”