How many paths to awareness in binocular vision?
” Perception 38 ECVP Abstract Supplement, page 110 How many paths to awareness in binocular vision? M A Georgeson, T S Meese Two eyes are better than one. Current models based on binocular summation of signals from each eye, with interocular contrast gain control, predict well the detection, discrimination and perception of monocular and binocular contrast. We now ask whether monocular signals also remain available to perception. We presented horizontal 1 cycle deg-1 sine-wave gratings of contrast C to both eyes for 500 ms in a 2AFC discrimination task, to determine whether contrast increments (C+ΔC ) in one eye were made more difficult to detect when accompanied by contrast decrements (C-ΔC ) in the other eye. Simple summation or averaging over the two eyes should make these opposite changes cancel each other. Results from two experiments (means of 5 – 6 observers) at 3 pedestal contrasts (C=0, 1, 10%, always binocular) consistently showed no cancellation. Binocular increments or
