“…It is generally recognised that performance in this sort of task may be mediated by a verbal code (Baddeley, 1976, pp. 216-217): for instance, instructing subjects to name the objects depicted reliably enhances recall performance (Bahrick & Boucher, 1968;Bower, 1970a;Kurtz & Hovland, 1953). Nevertheless, both visual and verbal intervening tasks interfere with the recall of pictorial stimuli (Cohen & Granstrom, 1968, 1970Pellegrino, Siegal, & Dhawan, 1975;Warren, 1977), and Paivio and Csapo (1 973) demonstrated experimentally that pictorial and verbal mnemonic codes operate together in a functionally independent manner.…”