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首页> 外文期刊>The European Journal of Neuroscience >Attention-dependent coupling between beta activities recorded in the cat's thalamic and cortical representations of the central visual field.
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Attention-dependent coupling between beta activities recorded in the cat's thalamic and cortical representations of the central visual field.

机译：在猫的丘脑和中央视野的皮层表征中记录的beta活动之间的注意力依赖耦合。

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摘要

We have previously proposed that enhanced 16-24 Hz (beta) local field potential activity in the primary visual cortex and lateral geniculate nucleus may be an electrophysiological correlate of the attentional mechanism that increases the gain of afferent visual information flow to the cortex. In this study, we measured coupling between beta signals recorded in the thalamic (i.e. lateral geniculate or perigeniculate) and cortical representations of the central visual field (within 5 degrees from area centralis), during visual and auditory attentive situations. Signal coupling was calculated in two ways: (i) by means of crosscorrelation between raw beta activities, which depends primarily on phase coherence, and (ii) by phase-independent crosscorrelation between amplitude envelopes of beta activities. Mean amplitudes of raw signal crosscorrelations obtained for thalamo-cortical recording pairs were not significantly different when calculated during behavioural demands for either visual or auditory attention. In contrast, amplitudes of envelope crosscorrelations obtained during behaviour requiring visual attention were, on average, two times higher than those calculated during the auditory task. This attention-related coupling emerged from synchronized amplitude modulation of beta oscillatory activity that occurs within the cortico-thalamic circuit involved in central vision.
机译：我们以前曾提出，在主要视觉皮层和外侧膝状核中增强的16-24 Hz（β）局部场电势活动可能是注意力机制的电生理相关性，从而增加了传入视觉信息流向皮质的获取。在这项研究中，我们在视觉和听觉注意力集中的情况下，测量了丘脑（即外侧膝状肌或周围膝状肌）中记录的β信号与中央视野的皮质表示（距中央区域5度以内）之间的耦合。信号耦合的计算方法有两种：（i）通过原始beta活动之间的互相关，这主要取决于相位相干性;（ii）通过beta活动的幅度包络之间的与相位无关的互相关。当在视觉或听觉注意的行为需求期间进行计算时，丘脑-皮层记录对获得的原始信号互相关的平均幅度没有显着差异。相反，在需要视觉注意的行为期间获得的包络互相关幅度平均比在听觉任务期间计算得到的幅度大两倍。这种与注意力有关的耦合源于β振荡活动的同步振幅调制，该振幅发生在涉及中央视觉的皮层丘脑回路内。

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