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首页> 外文期刊>Journal of Neurophysiology >Contributions of excitation and suppression in shaping spatial frequency selectivity of V1 neurons as revealed by binocular measurements.
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Contributions of excitation and suppression in shaping spatial frequency selectivity of V1 neurons as revealed by binocular measurements.

机译：双目测量显示，在塑造V1神经元的空间频率选择性方面，激发和抑制的作用。

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摘要

Neurons in the early visual cortex are generally highly sensitive to stimuli presented to the two eyes. However, the majority of studies on spatial and temporal aspects of neural responses were based on monocular measurements. To study neurons under more natural, i.e., binocular, conditions, we presented sinusoidal gratings of a variety of spatial frequencies (SF) dichoptically in rapid sequential flashes and analyzed the data using a binocular reverse correlation technique for neurons in cat area 17. The resulting set of data represents a frequency-domain binocular receptive field from which detailed selectivities, both monocular and binocular, could be obtained. Consistent with previous studies, the responses could generally be explained by linear summation of inputs from the two eyes. Suppressive responses were also observed and were delayed typically by 5-15 ms relative to excitatory responses. However, we have found more diverse nature of suppressive responses than those reported previously. The optimal suppressive frequency could be either higher or lower than that of the excitatory responses. The bandwidth of SF tuning of the suppressive responses was usually broader than that of the excitatory responses. Cells with lower optimal SFs for suppression tended to show high optimal SFs and sharp tuning curves. The dynamic shift of optimal SF from low to high SF was accompanied by suppression with earlier onset and higher peak SF or later onset and lower peak SF than excitation. These results suggest that the suppression plays an essential role in generating the temporal dynamics of SF selectivity.
机译：早期视觉皮层中的神经元通常对呈现给两只眼睛的刺激高度敏感。但是，大多数关于神经反应的时空方面的研究都是基于单眼测量。为了研究更自然（即双目）条件下的神经元，我们以快速连续闪光的方式双色显示了各种空间频率（SF）的正弦光栅，并使用双目反向相关技术对猫区域17中的神经元进行了分析。一组数据代表一个频域的双眼感受野，从中可以获得详细的选择性，包​​括单眼和双眼。与以前的研究一致，通常可以通过两只眼睛的输入的线性求和来解释响应。还观察到抑制反应，并且相对于兴奋性反应通常被延迟5-15ms。但是，我们发现抑制反应的性质比以前报道的更为多样。最佳抑制频率可以高于或低于兴奋反应的频率。抑制反应的SF调节带宽通常比兴奋反应的带宽宽。用于抑制的最佳SF较低的单元倾向于显示较高的最佳SF和清晰的调谐曲线。最佳SF从低SF到高SF的动态变化伴随着比起激发更早发作和更高峰SF或更晚发​​作和更低SF峰的抑制。这些结果表明，抑制在产生SF选择性的时间动态中起着至关重要的作用。

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