The brightness that results from stimulating a particular test-region of the retina may be depressed or enhanced by simultaneous stimulation of other "inducing"-regions. The test-region brightness may be affected by contiguous inducing-regions (local contrast effects), and by non-contiguous inducing regions (long-range effects sometimes called "assimilation"). We describe a computational model ...

Citation: Gilchrist A (2015) Commentary: What visual illusions tell us about underlying neural mechanisms and observer strategies for tackling the inverse problem of achromatic perception. A commentary on What visual illusions tell us about underlying neural mechanisms and observer strategies for tackling the inverse problem of achromatic perception. Blakeslee and McCourt state repeatedly that ...

BACKGROUND The perception of brightness depends on spatial context: the same stimulus can appear light or dark depending on what surrounds it. A less well-known but equally important contextual phenomenon is that the colour of a stimulus can also alter its brightness. Specifically, stimuli that are more saturated (i.e. purer in colour) appear brighter than stimuli that are less saturated at the...

We establish the greatest upper bound for the product of the i-th brightness-integrals of a convex body and its polar dual. Further, the greatest upper bound for the product of the brightness-integrals of order p of a convex body and its polar dual is also given.