Sun Hao, Rüttiger Lukas, Lee Barry B
SUNY State College of Optometry, 33 W. 42nd Street, New York, NY 10036, USA.
Vision Res. 2004 Jan;44(1):19-33. doi: 10.1016/j.visres.2003.08.017.
Comparison of the spatiotemporal information delivered by ganglion cells with human psychophysical performance may give insight to how retinal information is utilized by cortical mechanisms, and constrain models of spatiotemporal processing. Ganglion cells' responses were measured with drifting gratings of various spatial and temporal frequencies and contrasts. The spatiotemporal precision of cell responses was estimated in terms of a noise measure and phase variation, and compared to human vernier performance. Noise and phase variation of magnocellular (MC) cells was least at low temporal frequencies, despite their transient responses. The patterns of spatiotemporal precision of MC cells resembled the patterns of human vernier thresholds while those of parvocellular cells did not, implying use of MC cells' signals in these tasks. The analysis further implied that cortical mechanisms must perform a sophisticated spatiotemporal analysis over local ganglion cell arrays.
将神经节细胞传递的时空信息与人类心理物理学表现进行比较，可能有助于深入了解视网膜信息是如何被皮层机制利用的，并限制时空处理模型。使用具有各种空间和时间频率以及对比度的漂移光栅来测量神经节细胞的反应。根据噪声测量和相位变化估计细胞反应的时空精度，并与人类游标性能进行比较。大细胞（MC）尽管具有瞬态反应，但在低时间频率下噪声和相位变化最小。MC细胞的时空精度模式类似于人类游标阈值模式，而小细胞的模式则不同，这意味着在这些任务中使用了MC细胞的信号。分析进一步表明，皮层机制必须对局部神经节细胞阵列进行复杂的时空分析。
