Attentional Modulation of Envelope-Following Responses at Lower (93-109 Hz) but Not Higher (217-233 Hz) Modulation Rates.

Attentional Modulation of Envelope-Following Responses at Lower (93-109 Hz) but Not Higher (217-233 Hz) Modulation Rates.
复制标题

较低(93-109 Hz)的包络膜响应的注意调制,但不是更高(217-233 Hz)调制速率。

DOI:
10.1007/s10162-017-0641-9
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发表时间:
2018-03
期刊:
Journal of the Association for Research in Otolaryngology : JARO
影响因子:
--
通讯作者:
Johnsrude IS
Johnsrude IS
中科院分区:
其他
文献类型:
--
作者:
Holmes E;Purcell DW;Carlyon RP;Gockel HE;Johnsrude IS

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将注意力集中在不同频率的声音上,可以让听众在混合声中感知到感兴趣的声音,就像说话者一样。皮质产生的频率特异性注意力是否会影响低至听觉脑干的反应,目前尚不清楚。参与者参加了一个高或低频率的音调流,这是同时提出的,并与不同的幅度调制(AM)率标记。在一个复制设计中,我们发现,只有当刺激AM速率慢到足以让听觉皮层跟踪时,注意力才能调制跟随性反应(EFR),而不是更快AM速率的刺激,这被认为反映了“更纯粹”的脑干来源。因此,我们没有发现可以确信地归因于脑干发生器的频率特异性注意力调制的证据。结果表明,不同的神经群体有助于EFR在较高和较低的利率,兼容皮质的贡献在较低的利率。结果进一步证明,刺激AM速率可以改变EFR研究的结论。
Directing attention to sounds of different frequencies allows listeners to perceive a sound of interest, like a talker, in a mixture. Whether cortically generated frequency-specific attention affects responses as low as the auditory brainstem is currently unclear. Participants attended to either a high- or low-frequency tone stream, which was presented simultaneously and tagged with different amplitude modulation (AM) rates. In a replication design, we showed that envelope-following responses (EFRs) were modulated by attention only when the stimulus AM rate was slow enough for the auditory cortex to track—and not for stimuli with faster AM rates, which are thought to reflect ‘purer’ brainstem sources. Thus, we found no evidence of frequency-specific attentional modulation that can be confidently attributed to brainstem generators. The results demonstrate that different neural populations contribute to EFRs at higher and lower rates, compatible with cortical contributions at lower rates. The results further demonstrate that stimulus AM rate can alter conclusions of EFR studies.
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