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Early ERP components to gaps in white noise: onset and offset effects

机译：早期ERP组件到白噪声中的间隙：发作和偏移效果

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摘要

Evoked potentials to two stimulus types were compared: (1) binaural continuous white noise with randomly distributed gaps of different durations and (2) click pairs presented with intervals identical to the gap durations.Potentials were detected in response to gaps of 5 ms or longer, corresponding to the subjects' psychoacoustic gap detection threshold. The waveforms to all click pairs and to gap offsets were similar and single-peaked, while response to gap onset included two Nl negativities about 60 ms apart, regardless of gap duration. The first peak (Nla) was more frontal in its distribution and similar to that of clicks. The second (Nib) peak's scalp distribution was more central/temporal.The differences between waveforms to click pairs and gap offsets, compared with gap onsets, suggest that potentials to gap onsets involve more than just onset/offset responses (Nl, Nla) but also the subsequent perception of the cessation of an ongoing sound (Nib), In previous studies, two processes were defined: (1) M-process to deviation from the preceding auditory pattern and (2) C-process in response to acoustic change within an ongoing stream. We propose that Nib is different from these processes because it relates to the negation of an ongoing stimulus, and we thus call it an N-process.
机译：比较了两种刺激类型的潜力：（1）双耳连续白噪声，随机分布的不同持续时间的间隙和（2）点击与间隙持续相同的间隔的点击对。响应于5 ms或更长的间隙检测相同的间隔。 ，对应于受试者的心理声学间隙检测阈值。所有单击对的波形和间隙偏移相似，单点峰值，而对GAP发作的响应包括两个NL否定的否定，而不管间隙持续时间如何。第一个峰值（NLA）在其分布中更为正面，类似于点击次数。第二个（NIB）峰值的头皮分布更加中央/时间。与间隙onsets相比，单击对和间隙偏移的波形之间的差异表明，差距onSets的潜力涉及仅仅是开始/偏移响应（NL，NLA），但是此外，随后对持续的声音（NIB）的停止感知，在先前的研究中定义了两个过程：（1）M-Process偏离前面的听觉模式和（2）C-Process响应于内部的声学变化正在进行的流。我们提出了NIB与这些过程不同，因为它与持续刺激的否定有关，因此我们称之为N-Process。

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