7. Measurement of High-order Aberrations and Prediction of Effects on Vision Xx. Neurophysiology A. Cholinergicity in the Optic Nerve and Tectum Of

Even when we cannot directly see the light falling on an ensemble of objects, we tend to perceive object colors independently of the spectrum of this light. This color constancy may arise from comparisons of matte-reflected lights, but it may be facilitated by object highlights. We hope to develop a scheme whereby the human visual system might abstract illuminant-invariant object colors, subject to certain constraints. I Tangential to this problem is an investigation of the color cues accompanying the recognition of a translucent sheet partially eclipsing an ensemble of opaque objects.