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Sign selectivity in three units that gave no observable response to PM presented alone. A,Df >0-selective unit (t82 = 6.80; p < 0.00000001). Vertical scale, 46.2 spikes/sec. B, Df <0-selective unit (t56 = 2.24; p < 0.05). Vertical scale, 9 spikes/sec. C, Df >0-selective unit (t82 = 2.10; p < 0.05). Vertical scale, 77.4 spikes/sec.
