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From the Naval Aerospace Medical Research Laboratory, Pensacola, Florida (E.R.M.); Departments of Medicine (K.L.K.) and Psychology (R.M.S.), Pennsylvania State University; and Department of Psychology, University of Missouri, Columbia, Missouri (J.F.T.).

View larger version (15K): [in a new window]   Fig. 1. EGG tracings during the baseline period and during the shock and dive stimuli. The segments shown are 1 minute in duration and are from the same subject. Notice the change in frequency during the shock stimulus compared with the baseline period and the relative lack of change in frequency during the dive stimulus compared with the baseline period.