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Mean peak ASR startle response for auditory prepulse inhibition (PPI) is presented as a function of context (i.e., concurrent visual or tactile stimulus). HIV-1 Tg animals exhibited a differential sensitivity to the manipulation of context, evidenced by a rightward shift in peak inhibition in the tactile context relative to the visual context. Control animals exhibited peak inhibition at the 30 msec ISI regardless of context.
