Evidence That Primary Visual Cortex Is Required for Image, Orientation, and Motion Discrimination by Rats
Each panel shows pre- and post-lesion performance for V1 lesion (subject S1, black bar), medial extrastriate lesion (subject S2, gray bar), and the average of the sham lesion controls (S3–5, white bar), as well as the individual sham control subjects (superimposed symbols). Error bars indicate 95% binomial confidence intervals. A. Approach Salient Visual Target task (statue target). B. Motion Discrimination task, 85% coherent motion. C. Image Discrimination task. D. Orientation Discrimination task, which was learned before surgery by only two subjects, S1 and S2. The V1 lesion subject had large and highly significant deficits in motion, image, and orientation discrimination tasks, whether compared to its own pre-lesion performance, compared to sham or extrastriate lesion performance, or compared to post-lesion performance of the same subject on the approach task.