Effects of Duration and Rise Time of Tone Bursts on Evoked <i>V</i> Potentials

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  • Shinjiro Onishi
    Central Institute for the Deaf, 818 South Euclid, St. Louis, Missouri 63110
  • Hallowell Davis
    Central Institute for the Deaf, 818 South Euclid, St. Louis, Missouri 63110

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<jats:p>Tone bursts of 1000 Hz with linear on and off ramps and plateaus of various durations were used to evoke cortical (vertex) potentials in five adult subjects. With 30 msec rise time, the amplitude, from N1 peak to P2 trough, and the latency to either the N1 peak or P2 trough were all independent of duration of the plateau from 0 to 300 msec. With 3 msec rise time, the amplitudes were progressively reduced when the plateau was shortened from 30 msec to 10, 3, or 0 msec. With a long plateau, the amplitudes were nearly constant for rise times of 50 msec or less. The latency of the V potential was prolonged at intensities of 45 dB (ISO) or less and also in relation to the slope of the onset ramp. With very gradual slope [300 msec to reach 45 dB (ISO)], mean latency to N1 was 169 msec while with very steep slope [3 msec to reach 85 dB (ISO)], it was 109 msec. OFF responses showed similar relations but with smaller amplitudes and shorter (by 16 msec) latencies. For evoked-response audiometry, the rise time of the test signal will not be critical if it is 30 msec or less and the plateau is at least 30 msec long, and any plateau of 30 msec or longer will be acceptable.</jats:p>

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