Conditioning of the autonomically regulated pupillary reflex was studied in young human infants, Sound as a CS was not effective for conditioning the pupillary reflex. Both time and time plus sound were effective CSs for establishing both conditioned pupil dilation and constriction. The results indicate a capacity in young human infants for accurately perceiving the passage of short intervals of time.
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Fitzgerald et al. (1967) studied this question.
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