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Average responses of five H2 cells ± SEM during a 2 sec presentation of the visual stimulus. Top, The stimulus conditions. Bottom, The responses. Note that although the cells do not respond to unilateral motion in front of the left eye in either direction (columns 1, 2), addition of this stimulus to a back-to-front stimulus in front of the right eye influences the response in a directionally selective way (compare columns 4, 5).
