Temporal Evannation: a New Approach in Diagnostic Audiology

Abstract

The normal spontaneous activity of the cortex may be expected to average to zero. Evoked responses, particularly auditory stimuli, may be detected by repeated sampling of the EEG at fixed intervalsfollowing stimulation. Nine normal hearing college students had 3 samples of 1024 pulses presented every 63 msec. There was a negative peak at 25 msec, a positive peak at 35 msec, and a second negative peak at 50 msec. Clicks of 65, 55, and 30 db in three 1024 unit samples were presented every 80 msec. Amplification generally increases with intensity.