According to the picture superiority effect, concepts are much more likely to be remembered experientially if they are presented as pictures rather than as words.
According to dual-coding theory by Allan Paivio (1971, 1986), memory exists either (or both) verbally or "imaginally". Concrete concepts presented as pictures are encoded into both systems; however, abstract concepts are recorded only verbally.
In psychology the effect has implications for salience in attribution theory as well as the availability heuristic. It is also relevant to advertising.