Fig. 5.

Magnitude of collinear facilitation revealed with axis-tuning experiments. A, Response to the collinear (preferred) stimulus configuration relative to the SG response shows facilitation for all sites (responses increased between 30 and 600%).B–D, Responses to noncollinear conditions (depicted with stimulus icons, insets) failed to produce consistent change from SG. For A,B, n = 35; for C,D, n = 26. Results for individual sites are aligned vertically for comparison across the four stimulus conditions.