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The method for calculating preferred directions of smooth pursuit and latencies of discharge modulation. (A) Histograms of example neuron discharge during pursuit along 8 directions. (B) Gaussian fit. Dots indicate mean discharge rate in each direction fitted by Gaussian curve from equation (1). The preferred direction was estimated to be 303.5° ± 1.1° SD for this neuron. (C) Latencies of discharge modulation (1 bin = 6 ms). Downward arrow indicates the time at which the mean discharge rate exceeded 2 SD of the mean discharge rate calculated for the 500-ms interval immediately before target motion onset. Vertical dotted line and horizontal solid line show target motion onset and 2 SD of the mean responses of baseline period, respectively. (A–C) are responses from the same neuron.