Extended Data Fig. 1: Robust responses to inverse stimuli with blurred edges.
From: Feedback generates a second receptive field in neurons of the visual cortex
a, Experimental configuration. b, Top, schematics of stimuli used for size-tuning functions. Bottom, population-averaged size tuning of classical and inverse stimuli with sharp edges (left) and blurred edges (right) (Methods). Here and in all other figures, black and red traces are responses to classical and inverse stimuli, respectively, and shaded areas are periods of stimulus presentation. Solid lines are fits to the data (Methods). Triangles above size-tuning functions indicate the median preferred size for each condition. The inset show the maximum responses, with horizontal lines indicating the medians. Two-sided Wilcoxon signed-rank test were used to compare the maximum responses for classical and inverse stimuli under each condition; sharp edge, ***P = 2.0 × 10−9; blurred edge, ***P = 4.5 × 10−10; 773 neurons in 4 mice. Data are mean (traces or data points) ± s.e.m. (shading or error bars). Here and in all other figures, error bars are present but are sometimes smaller than symbols.
