The N100m response to a specific same-sound stimulus may be altered by the degree of attention paid to the stimulus. When participants selectively pay attention to the stimulus, the N100m amplitude increases; however, minimal effects are observed on the N100m latency. In this study, we examined the effects of selective special attention (motivation) to extract the frequency (or pitch) information from a probe tone on the N100m response to the probe tone. We compared the N100m latencies and amplitudes using magnetoencephalography, with the following three experimental conditions: 1) vocalization task protocol (vocalize in tune with the pitch of the probe tone after the presentation of the probe tone), 2) hearing task protocol (just listen to the probe tone), and 3) imagining (just imagine the vocalization in tune with the probe tone). The results indicated that the N100m latency in response to the probe tone was significantly shortened in the vocalization and imagining tasks compared with the hearing task in the right hemisphere of the brain. The amplitude was significantly increased in the vocalization task compared with the imagining and hearing tasks in the right hemisphere, and in the vocalization task compared with the hearing task in the left hemisphere of the brain; that is, the attention and/or motivation required to extract the information from the stimulus tones may have caused N100m latency shortening. To our knowledge, this study is the first to demonstrate that the N100m latency may be shortened under particular attentional conditions in response to a simple tone.

N100m 对特定相同声音刺激的反应可能会因对刺激的关注程度而改变。当参与者选择性地关注刺激时，N100m 振幅增加；然而，观察到对 N100m 延迟的影响很小。在这项研究中，我们研究了选择性特殊注意（动机）从探测音中提取频率（或音调）信息对 N100m 对探测音响应的影响。我们使用脑磁图比较了 N100m 延迟和幅度，具有以下三个实验条件：1）发声任务协议（在出现探测音后与探测音调一致发声），2）听力任务协议（只听到探测音），和 3）想象（想象一下与探测音调一致的发声）。结果表明，与大脑右半球的听力任务相比，在发声和想象任务中响应探测音的 N100m 潜伏期显着缩短。与大脑右半球的想象和听力任务相比，发声任务中的振幅显着增加，与大脑左半球的听力任务相比，发声任务中的振幅显着增加；也就是说，从刺激音中提取信息所需的注意力和/或动机可能导致 N100m 延迟缩短。据我们所知，这项研究首次证明 N100m 潜伏期可能会在特定的注意力条件下缩短，以响应简单的音调。