Laminar differences in gamma and alpha coherence in the ventral stream
Laminar differences in gamma and alpha coherence in the ventral stream
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DOI：
10.1073/pnas.1011284108
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发表时间：
2011-07-05
影响因子：
11.1
通讯作者：
Desimone, Robert
中科院分区：
文献类型：
--
作者：
Buffalo, Elizabeth A.;Fries, Pascal;Desimone, Robert
注意刺激会增强视觉区域V4中神经元反应和γ频率同步，这两者都应增加有关下游神经元信息的影响。为了确定伽马同步是否在整个腹侧流中很常见，我们从两个恒河猴中V1，V2和V4的浅层和深层中的神经元记录。我们发现在浅表与深层中的伽马同步存在意想不到的差异。在这三个区域中，伽马（40-60 Hz）频率范围的尖峰场相干性在很大程度上仅限于浅层层，而深层在低频（6-16 Hz）下显示最大相干性，其中包括alpha范围。在V2和V4的浅表层中，伽马同步受到注意增强，而在深层中，α同步被注意减少了。与同步的主要差异不同，浅层和深层之间对发射速率和噪声相关性的注意影响没有显着差异。结果表明，同步在反馈和馈电预测中起着非常不同的作用。
Attention to a stimulus enhances both neuronal responses and gamma frequency synchrony in visual area V4, both of which should increase the impact of attended information on downstream neurons. To determine whether gamma synchrony is common throughout the ventral stream, we recorded from neurons in the superficial and deep layers of V1, V2, and V4 in two rhesus monkeys. We found an unexpected striking difference in gamma synchrony in the superficial vs. deep layers. In all three areas, spike-field coherence in the gamma (40-60 Hz) frequency range was largely confined to the superficial layers, whereas the deep layers showed maximal coherence at low frequencies (6-16 Hz), which included the alpha range. In the superficial layers of V2 and V4, gamma synchrony was enhanced by attention, whereas in the deep layers, alpha synchrony was reduced by attention. Unlike these major differences in synchrony, attentional effects on firing rates and noise correlation did not differ substantially between the superficial and deep layers. The results suggest that synchrony plays very different roles in feedback and feedforward projections.