Groups of 7 1/2-month-old infants heard 1 of 8 episodes consisting of no, slight, moderate, or a large discrepancy between a habituated standard and a transformed auditory stimulus. The patterns of cardiac deceleration, regarded as an index of attention supported the hypothesis that attentiveness is an inverted-U function of the degree of discrepancy between stimulus event and schema.
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Kinney et al. (1976) studied this question.
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