Response latencies and receptive field shape of V1 neurons. A, Distribution of response latency across all layers of V1. B, Cumulative histogram of major and minor axes of receptive fields in V1. Insets show heat maps of spike rate outlining a representative receptive field. Raw data (top), after smoothing with Gaussian function (bottom). C, Dependence of receptive field size (major axis) on eccentricity. Shading indicates SD.