Fig. 7.

Population summary of contrast-response functions for superficial and deep induced gamma LFP power. A: gamma LFP power at individual superficial layer sites (thin blue, sigmoidal fits) and the population mean (blue circles, and thick blue). Curves from individual sites were normalized to their maximum before averaging. Error bars show standard error of the mean across sites (n = 13). B: same as in A for deep layer sites (n = 16). C: distributions of gamma LFP power transition ranges for superficial (blue histogram) and deep (red histogram) sites. Inverted triangles: distribution medians. D: distributions of gamma LFP power 50% contrasts (the contrast at which gamma LFP power reached 50% of its maximum value) for superficial and deep sites. Other conventions are as in C.