A recurrent neural network that produces EMG from rhythmic dynamics
A recurrent neural network that produces EMG from rhythmic dynamics
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从节奏动力学产生肌电图的循环神经网络
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
K. Shenoy
中科院分区：
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作者：
David Sussillo;Matthew T. Kaufman;K. Shenoy
在自由观看自然图像的过程中从猕猴身上得到的。为了测量神经元对这种情况下刺激特征的调节，我们使用了Gabor滤波器“能量”模型，并进行了修改，使刺激调节程度（“反应增益”）是自注视开始以来时间的函数。我们还拟合类似的模型，以LFP功率在不同的频段来描述刺激诱发的网络活动。我们发现，除了在尖峰活动和LFP中引起大的瞬时反应外，扫视还在LFP中夹带了~10 Hz的α振荡，该振荡在随后的注视中持续存在。通过转换到α周期的时间坐标，我们发现这些α振荡调制V1神经元的响应增益，导致眼跳后刺激处理的时间窗口。伽马（35-60 Hz）功率的刺激调谐类似地由α节律调制，并且伽马振荡通过尖峰-相位耦合为尖峰活动提供进一步的时间结构。这些结果表明，在自由观看，α振荡后扫视创建一个时间窗口的V1活动在固定，更普遍地表明，刺激驱动的网络动力学可能发挥重要作用，在塑造前馈刺激处理。
from a macaque during free viewing of natural images. To measure the neurons’ tuning to features of the stimulus in this context, we used Gabor-filter ‘energy’ models, modified such that the degree of stimulus tuning (‘response gain’) was a function of time since fixation onset. We also fit similar models to the LFP power in different frequency bands to describe the stimulus-evoked network activity. We found that, in addition to evoking a large, transient response in the spiking activity and LFP, saccades entrained ~10 Hz alpha oscillations in the LFP that persisted throughout the subsequent fixation. By transforming to time coordinates of alpha cycles, we found that these alpha oscillations modulated the response gain of V1 neurons, resulting in a temporal windowing of the stimulus processing following saccades. The stimulus tuning of gamma (35-60 Hz) power was similarly modulated by the alpha rhythm, and the gamma oscillations provided further temporal structure to the spiking activity through spike-phase coupling. These results show that during free viewing, alpha oscillations following saccades create a temporal windowing of V1 activity during fixations, and more generally suggest that stimulus-driven network dynamics may play an important role in shaping feedforward stimulus processing.