Responses of two direction-selective cells in areas 17 and 18 to different moving directions and speeds of random dots.

<p>(A) Typical polar plots of direction tunings of direction-selective cells generated using sine-wave grating stimuli. PD, preferred direction; DSI, direction selective index; PO, preferred orientation; OSI, orientation selective index. N = 6 and 5 trials for the cells in areas 17 and 18 respectively. (B) Polar plots of direction tunings acquired by using random-dot stimuli moving at different speeds. PA, preferred motion axis; ASI, motion-axis selective index. N = 10 trials for both cells. The spontaneous firing rates of the cells are 0 spikes/s and 2 spikes/s in areas 17 and 18 respectively. Error bars represent SEM.