In a perceptual condition (P), information critical to the solution of a problem was presented by means of a simple demonstration; in a verbal condition (V), this same information was presented by means of a short verbal statement; and in a control condition (C), this information was not presented at all. There was a significant linear trend (p < .001) between information condition and solution score such that solution scores for P were higher than those for V and those for V were higher than those for C. In addition, most Ss (80%) reported using images, and imaging was positively correlated with solution score (r = .55, p = .03) in the P condition and only in that condition.
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