ABSTRACT
When animals are required to recall or recognize a previously presented stimulus, accuracy decreases as a function of the time since its presenta tion (e.g., Berryman, Cumming, & Nevin, 1963; D ’Am ato, 1973; Grant & Roberts, 1973; H arnett, McCarthy, & Davison, 1984; Jans & Catania, 1980; Nelson & Wasserman, 1978; Shimp & Moffitt, 1977; Wasserman, Nelson, & Larew, 1980; W hite, 1985; White & McKenzie, 1982). Many variables are known to affect such remembering, such as duration of training (Berryman et al., 1963), sample-stimuli disparity (White, 1985), sample-response requirements (Roberts, 1972), prior interfering trials (Grant, 1975), novel stimulation during the retention interval (Jans & Catania, 1980; W hite, 1985), and the duration of the intertrial interval (Edhouse & W hite, 1988; Maki, Moe, & Bierley, 1977; Roberts & Kraemer, 1982).
