Figure 4.

(A) Position of the stimulus aperture within the visual defects of each monkey with a unilateral striate cortex lesion (I-1, I-2, I-3, and A-3). Unshaded areas represent zones of the visual field with corresponding intact striate cortex. Circles show the positions of the 5° and 15° motion apertures within the reconstructed field defect. (B) Performance of monkeys with infant V1 lesions on the discrimination of moving from static, coherently moving from motion “noise” and upward from downward motion. Motion stimuli were presented in a 5° aperture. Speed of motion was 20°/s. The gray line indicates performance expected by chance. (C) Performance of the same monkeys on the discrimination of upward from downward motion when the motion stimuli were presented in 5° or 15° apertures. Speeds of motion were 4°/s (“slow”) or 20°/s (“fast”).