The effects of background tone (BGT) on the waveform of the auditory evoked potentials obtained from nine male students exposed to 95 ms tone bursts were studied at 250 Hz, 500 Hz, 1 kHz, 2kHz and 4 kHz. The sound intensity of the toneburst was 80 dB (SL), and that of BGT was 60 dB (SL). A decrease in the amplitudes, and an increase in the latency of the N1 component with BGT, were shown. BGT had more effect on the N1 component than on the P2 component. Frequency changes affected the amplitude of the N1 component and the latency of the P2 component. © 1989.
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