猫视觉系统暗放电、维持放电和驱动放电的分形特征
Fractal features of dark, maintained, and driven neural discharges in the cat visual system
摘要：
我们采用了一些统计措施来表征猫视网膜神经节细胞（RGC）和他们的目标外侧膝状体核（LGN）神经元在各种刺激条件下的神经放电活动，我们开发了一种新的措施来检查尖峰列车对之间的分形活动的相关性。在没有刺激的情况下（即，在黑暗中），RGC和LGN放电表现出类似的特性。向眼睛呈现恒定、均匀的亮度减少了RGC维持放电中的分形波动，但增强了目标LGN放电中的分形波动，使得成对的神经活动不再彼此镜像。一个漂移光栅刺激产生RGC和LGN驱动的尖峰列车类似的字符中观察到的维持放电，有两个显着的区别：动作电位沿时间轴重组，使它们只发生在某些阶段的刺激波形，分形活动被抑制。在均匀亮度和漂移光栅刺激条件下（但不是在黑暗中），LGN细胞对的放电在长时间尺度上高度相关;相反，RGCs的放电几乎彼此不相关。这表明，在LGN的动作电位活动受到一个共同的分形调制，而RGC不受。
英文摘要：
We employ a number of statistical measures to characterize neural discharge activity in cat retinal ganglion cells (RGCs) and in their target lateral geniculate nucleus (LGN) neurons under various stimulus conditions, and we develop a new measure to examine correlations in fractal activity between spike-train pairs. In the absence of stimulation (i.e., in the dark), RGC and LGN discharges exhibit similar properties. The presentation of a constant, uniform luminance to the eye reduces the fractal fluctuations in the RGC maintained discharge but enhances them in the target LGN discharge, so that neural activity in the pair no longer mirror each other. A drifting-grating stimulus yields RGC and LGN driven spike trains similar in character to those observed in the maintained discharge, with two notable distinctions: action potentials are reorganized along the time axis so that they occur only during certain phases of the stimulus waveform, and fractal activity is suppressed. Under both uniform-luminance and drifting-grating stimulus conditions (but not in the dark), the discharges of pairs of LGN cells are highly correlated over long time scales; in contrast discharges of RGCs are nearly uncorrelated with each other. This indicates that action-potential activity at the LGN is subject to a common fractal modulation to which the RGCs are not subjected.
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