Perception-related modulations of local field potential power and coherence in primary visual cortex of awake monkey during binocular rivalry
Perception-related modulations of local field potential power and coherence in primary visual cortex of awake monkey during binocular rivalry
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DOI：
10.1093/cercor/bhg129
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发表时间：
2004-03-01
期刊：
影响因子：
3.7
通讯作者：
Eckhorn, R
中科院分区：
文献类型：
--
作者：
Gail, A;Brinksmeyer, HJ;Eckhorn, R
伽马频率（35-90 Hz）的皮质同步已被提议用来定义感知视觉对象的局部部分之间的连通性。这一假设仍在争论中。我们在双眼竞争（BR）条件下对其进行了测试，其中猴子感知到以正交方向单独呈现给每只眼睛的冲突光栅之间的交替。我们在 BR 期间对纹状皮层 (V1) 的多单位活动 (MUA) 和局部场电位 (LFP) 进行了多通道微电极记录，同时猴子通过推动杠杆来表示他的感知。我们分析了 4-90 Hz 范围内 MUA 和 LFP 的光谱功率和相干性。与之前的工作一样，当刺激在双眼中一致呈现时，大多数记录位置对中伽马信号的相干性很大程度上取决于光栅方向。在不一致（竞争性）刺激的情况下，LFP 功率通常会根据感知状态进行一致调节。这在 MUA 中是不可见的。这些与感知相关的 LFP 调制发生在低频和中频（
Cortical synchronization at gamma-frequencies (35-90 Hz) has been proposed to define the connectedness among the local parts of a perceived visual object. This hypothesis is still under debate. We tested it under conditions of binocular rivalry (BR), where a monkey perceived alternations among conflicting gratings presented singly to each eye at orthogonal orientations. We made multi-channel microelectrode recordings of multi-unit activity (MUA) and local field potentials (LFP) from striate cortex (V1) during BR while the monkey indicated his perception by pushing a lever. We analyzed spectral power and coherence of MUA and LFP over 4-90 Hz. As in previous work, coherence of gamma-signals in most pairs of recording locations strongly depended on grating orientation when stimuli were presented congruently in both eyes. With incongruent (rivalrous) stimulation LFP power was often consistently modulated in consonance with the perceptual state. This was not visible in MUA. These perception-related modulations of LFP occurred at low and medium frequencies (