“…Evidence from the cognitive sciences shows that visual displays do enhance learning (Vekiri, 2002;Winn, 1991). Visual mapping allows the separate encoding of information in memory in visual and well as propositional form, a phenomenon called "conjoint retention" or "dual coding" (Kulhavy, Lee, & Caterino, 1985;Paivio, 1971Paivio, , 1983Schwartz, 1988). In the former hypothesis, representations are encoded as separate intact units; in the latter, visual representations are synchronously organised and processed simultaneously and verbal representations are hierarchically organised and serially processed (Vekiri, 2002).…”