Cortical, auditory, evoked potentials in response to changes of spectrum and amplitude
Cortical, auditory, evoked potentials in response to changes of spectrum and amplitude
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DOI：
10.1121/1.428556
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发表时间：
2000-04-01
影响因子：
2.4
通讯作者：
Boothroyd, A
中科院分区：
文献类型：
--
作者：
Martin, BA;Boothroyd, A
声学变化复合体(ACC)是一种由头皮记录的负正电压摆动，在其他稳态声音中由变化引起。8名成人对持续800ms的三共振峰合成元音的时间中心的幅度和/或频谱包络的变化作出反应，获得了ACC。在没有频谱变化的情况下，组平均波形表现为明显的ACC，幅度增加2d B或以上，幅度减少3d B或以上。在第二共振峰频率改变(从感知/u/到感知/i/)的情况下，幅度增加增加了ACC的幅度，但幅度减小几乎没有影响。仅可检测到的幅度变化接近听觉系统的心理声学极限这一事实对ACC的临床应用是一个很好的预兆。未能找到一个条件，在这种条件下，频谱引起的ACC因幅度的微小变化而减小，这支持了观察到的ACC对频谱包络的变化反映了皮层频率编码的某些方面的结论。综上所述，这些发现支持了ACC作为听觉辨别能力的客观指标的潜在价值。(C)2000年美国声学学会。[S0001-4966(00)01704-5]。
The acoustic change complex (ACC) is a scalp-recorded negative-positive voltage swing elicited by a change during an otherwise steady-state sound. The ACC was obtained from eight adults in response to changes of amplitude and/or spectral envelope at the temporal center of a three-formant synthetic vowel lasting 800 ms. In the absence of spectral change, the group mean waveforms showed a clear ACC to amplitude increments of 2 dB or more and decrements of 3 dB or more. In the presence of a change of second formant frequency (from perceived /u/ to perceived /i/), amplitude increments increased the magnitude of the ACC but amplitude decrements had little or no effect. The fact that the just detectable amplitude change is close to the psychoacoustic limits of the auditory system augurs well for the clinical application of the ACC. The failure to find a condition under which the spectrally elicited ACC is diminished by a small change of amplitude supports the conclusion that the observed ACC to a change of spectral envelope reflects some aspect of cortical frequency coding. Taken together, these findings support the potential value of the ACC as an objective index of auditory discrimination capacity. (C) 2000 Acoustical Society of America. [S0001-4966(00)01704-5].