We examined the effects of adding microcomputer-generated voice synthesis to a computer-assisted learning exercise involving clinical interviewing. Three modes of presenting case material were studied: (a) video text only, (b) voice only, and (c) synthesized voice-plus-video text. College students prefered either the voice-only or text-only presentation, but they more accurately recalled details of the case material in the voice-plus-video text mode.
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Banyan et al. (1990) studied this question.