Figure 11.

Threshold facilitation. The effect of interocular crosstalk when using our EIZO CRT-based dichoptic display and FE-1 (ferroelectric LC) shutter goggles. Contrast thresholds were determined with the left eye covered. When a mask was presented to the right (open) eye, there was facilitation of contrast detection for relative mask contrasts less than about three times the contrast threshold with no mask, and inhibition for higher contrast monocular mask conditions (open symbols). When a mask was presented to the closed (left) eye, it should not have been visible to the open (right) eye, and there should have been no effect on contrast thresholds (i.e., filled symbols should all be along the horizontal dashed line). crosstalk caused facilitation of contrast thresholds at all measured closed-eye mask contrasts, including contrasts that could not be detected (i.e., to the left of the vertical dashed line). Stimulus and mask were 1- cycle∕deg, 1 octave Gabor patches. Error bars are 95% confidence limits.