Auditory Evoked Potentials Generated by Noise Gaps: Effects of Onset, Offset and Duration.
Objectives: Composite nature of Auditory evoked Potentials (AEPs) generated by wide-band noise gaps at slow rates (1 Hz) is investigated by recording different gap duration responses and convolution simulations of onset and offset responses. Material and methods: In this study 10 noise gaps with varying durations (6 ms to 300 ms) are studied using monaural stimulation recorded with continuous recording of EEG at a high sampling rate (5 kHz). Recordings are averaged off-line and digitally filtered for analysis. Results: Long gaps evoke distinct onset and offset AEPs. For medium gaps responses become smaller with unidentifiable peaks. The largest AEPs are generated by 25 ms gaps. Shorter gaps produce small waves with distinct V, Pa, Pb peaks. Conclusions: Gap AEPs are generated by gap onset and offset responses and can be modeled by their destructive (medium duration) and constructive (short duration) overlap modified with adaptation and masking effects
