Nonspecific GSRs were recorded during periods of stimulation (sound and light) and resting in a group of medical and dental students. Testing occurred on 4 occasions over a 3-mo. period. There was significant stability of frequency over testings. Habituation occurred during both light and sound stimulation periods in the first testing but not in the remaining 3 testings. Alert Ss produced significantly more nonspecific GSRs than drowsy Ss.
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