“…Empirically, imagery and concreteness have been repeatedly demonstrated to be potent variables in a wide range of psychological tasks, including learning and memory tasks (e.g., Paivio, 1969), semantic retrieval tasks (e.g., Paivio, Clark, Digdon, & Bons, 1989), and diverse other cognitive tasks (for reviews, see Paivio, 1971Paivio, , 1986Paivio, , 1991. Although the empirical effects are well founded, their theoretical basis remains controversial, as researchers advanced other correlated properties such as context availability (Schwanenflugel, 1991;Schwanenflugel & Various aspects of this work were supported by research grants from the Natural Sciences and Engineering Research Council of Canada.…”