The effect of selective attention on the gamma-band auditory steady-state response
The effect of selective attention on the gamma-band auditory steady-state response
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DOI：
10.1016/j.neulet.2007.04.072
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发表时间：
2007-06-15
影响因子：
2.5
通讯作者：
O'Donnell, Brian F.
中科院分区：
文献类型：
--
作者：
Skosnik, Patrick D.;Krishnan, Giri P.;O'Donnell, Brian F.
研究表明，选择性注意可以调节稳态诱发电位对重复视觉和触觉刺激的反应。然而，注意力对听觉稳态反应（ASSR）的影响的检查已被证明是模棱两可的。因此，目前的实验利用EEG检查注意力对健康人（n = 15）ASSR的影响。听觉点击列车在β（20赫兹）和γ（40赫兹）的范围内随机呈现双耳在一个古怪的歧视范例（每个频率作为古怪的（目标），在每两个块）。使用快速傅立叶变换来评估注意力对ASSR（信号功率）的影响，并使用锁相因子（PLF）评估试验间的相位一致性。正如预期的那样，20和40 Hz目标都引起了强大的P300反应，在顶骨区域具有最大振幅。对于ASSR，发现EEG信号功率大于40 Hz目标，与所有额中央电极上的40 Hz频繁刺激相比。在20 Hz刺激期间未观察到信号功率差异。最后，与频繁试验相比，观察到40 Hz目标的PLF值增加。这些结果提供了证据，选择性注意可以提高信号功率和相位锁定的ASSR。特别是伽马范围内的听觉刺激。(c)2007爱思唯尔爱尔兰有限公司保留所有权利。
Studies have demonstrated that selective attention can modulate the steady-state evoked potential to repetitive visual and tactile stimulation. However, examinations of the effect of attention on the auditory steady-state response (ASSR) have proven equivocal. The current experiment therefore utilized EEG to examine the effect of attention on the ASSR in healthy humans (n = 15). Auditory click trains in the beta (20Hz) and gamma (40 Hz) ranges were randomly presented binaurally in an oddball discrimination paradigm (each frequency served as the oddball (target) in each of two blocks). A Fast Fourier Transform was used to assess the effect of attention on the ASSR (signal power), and phase consistency across trials was assessed using the phase-locking factor (PLF). As expected, both 20 and 40Hz targets elicited a robust P300 response, with maximal amplitudes over parietal regions. For the ASSR, it was found that EEG signal power was larger to 40Hz targets compared to 40Hz frequent stimuli across all frontocentral electrodes. No differences in signal power were observed during 20 Hz stimulation. Finally, increased PLF values were observed for 40 Hz targets compared to frequent trials. These results provide evidence that selective attention can enhance signal power and phase-locking of the ASSR. particularly to auditory stimulation in the gamma range. (c) 2007 Elsevier Ireland Ltd. All rights reserved.