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In this study, 79 young rats we re exposed to different types of infantile stimulation in order to determine the effects of stimulation of different sensory modalities on emotionality and l ~arning . Between the eleventh and t we ntieth days of life, the subjects received either a 25 volt A.C. shock, 75 decibels of white noise (aversiv e auditory stimulation), or h5 decibels of white noise (n onaversive auditory stimulation). One group was handl ed (h andled control) and anothe r group was l eft alone (nonh andled control). The hypothesis tested was that the different typ es of s t imulation would lead to a reduction of emotion a lity and an incr e ase in learning ability. The nonhandled controJ _ group suffer e d from an extremely high mortality rate and was excluded from most of the statistical analyses. There we re no differ enc es betw ee n the groups in lear ning ability . The results were mixed in reg a rd to adult emotionality. Ther e were no si gnificant diff'er e nces betw ee n th e experimenta l groups ; h oweve r, on some measures, there were significant differ e nc es ~ et we en on e or more of the experimental groups and th e h an dl ed control. · where significant diff ere nces were found to ex ist, the shock

The Effects of Auditory and Shock Stimulation Experienced in Infancy on Subsequent Emotionality and Learning in the Rate