ABSTRACT
When animals are required to recall or recognize a previously presented stimulus, accuracy decreases as a function of the time since its presentation (e.g., Berryman, Cumming, & Nevin, 1963; D'Amato, 1973; Grant & Roberts, 1973; Harnett, McCarthy, & Davison, 1984; Jans & Catania, 1980; Nelson & Wasserman, 1978; Shimp & Moffitt, 1977; Wasserman, Nelson, & Larew, 1980; White, 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; White, 1985), and the duration of the intertrial interval (Edhouse & White, 1988; Maki, Moe, & Bierley, 1977; Roberts & Kraemer, 1982).
