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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Natural movies evoke spike trains with low spike time variability in cat primary visual cortex.
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Natural movies evoke spike trains with low spike time variability in cat primary visual cortex.

机译:天然电影唤起了猫初级视觉皮层中峰值时间变化少的峰值序列。

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摘要

Neuronal responses in primary visual cortex have been found to be highly variable. This has led to the widespread notion that neuronal responses have to be averaged over large numbers of neurons to obtain suitably invariant responses that can be used to reliably encode or represent external stimuli. However, it is possible that the high variability of neuronal responses may result from the use of simple, artificial stimuli and that the visual cortex may respond differently to dynamic, naturalistic images. To investigate this question, we recorded the responses of primary visual cortical neurons in the anesthetized cat under stimulation with time-varying natural movies. We found that cortical neurons on the whole exhibited a high degree of spike count variability, but a surprisingly low degree of spike time variability. The spike count variability was further reduced when all but the first spike in a burst were removed. We also found that responses exhibiting low spike time variability exhibited low spike count variability, suggesting that rate coding and temporal coding might be more compatible than previously thought. In addition, we found the spike time variability to be significantly lower when stimulated by natural movies as compared with stimulation using drifting gratings. Our results indicate that response variability in primary visual cortex is stimulus dependent and significantly lower than previous measurements have indicated.
机译:已发现初级视觉皮层的神经元反应高度可变。这引起了广泛的观念,即必须在大量神经元上对神经元反应进行平均才能获得合适的不变反应,以用于可靠地编码或表示外部刺激。但是,神经元反应的高度变异性可能是由于使用简单的人工刺激而引起的,并且视觉皮层对动态自然图像的反应可能不同。为了研究这个问题,我们记录了时空自然电影刺激下麻醉猫的主要视觉皮层神经元的反应。我们发现,总体上,皮质神经元表现出高度的尖峰计数变异性,但出乎意料的低水平的尖峰时间变异性。当除去突发中除第一个峰值以外的所有峰值时,峰值计数的可变性会进一步降低。我们还发现,表现出低尖峰时间可变性的响应表现出低尖峰计数可变性,表明速率编码和时间编码可能比以前认为的更兼容。此外,我们发现,与使用漂移光栅的刺激相比,当受到自然电影刺激时,尖峰时间的可变性要低得多。我们的结果表明,主要视觉皮层的反应变异性取决于刺激,且显着低于以前的测量结果。

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