Contrast sensitivity and comparison of high vs. low eye dominance.

<p><b>A</b> Examples of contrast response functions for optimized grating patches presented via the dominant and non-dominant eyes. Note that in some cells (<b>Ai</b>) irrespective of the contrast, the response to stimuli presented via non-dominant eye is much weaker than that to stimuli presented via dominant eye. In other cells however, at low contrasts the response to stimuli presented via the dominant eye is not much stronger than that to stimuli presented via the non-dominant eye (<b>Aii</b>) or the eye dominance is reversed (<b>Aiii</b>). The C₅₀ contrasts, that is, the contrasts at which the magnitude of response to optimized stimuli confined to the sRF reached 50% of maximum response are indicted by the dashed lines. <b>B</b> Histogram showing the mean C₅₀ values of the contrast response functions of the current sample of cells when stimulated via the dominant or non-dominant eyes. <b>C</b> Frequency histograms of cells with high eye dominance indices (HEDI) and cells with low eye dominance indices (LEDI). Also shown is the equation by which eye dominance index has been determined. <b>D</b> Mean SI of HEDI and LEDI cells for stimuli presented via the dominant or non-dominant eyes. Error bars indicate SEM; ** indicate significant (P<0.01, Wilcoxon test) differences. <b>Ei</b> Scatter plot of the peak discharge rates for optimized grating patches presented via the dominant vs. optimized grating patches presented via the non-dominant eyes. <b>Eii</b> Mean peak discharges rates of HEDI and LEDI cells for stimuli presented via the dominant or non-dominant eyes. Error bars indicate SEM; # indicates marginally significant (P<0.05, Mann-Whitney test, one-tailed criterion) difference.