Zdravkovic & Gilchrest

When an object lies in two different illuminations, observers give different
lightness matches for the two regions (patches). They also make an
independent match for the whole object. Our goal was to determine whether
there is a systematic relationship between the object and patch matches.
Seven experiments are reported showing that object lightness depends on two
rules: 1) object matches will follow the patch matches under the larger
field of illumination, 2) object matches will follow the patch matches under the
highest illumination. This implies a parallel between anchoring in the
illumination domain and anchoring in the lightness domain.