Lightness constancy and its link with cone contrast.
The link between chromatic constancy (compensation for hue and saturation shifts) and lightness constancy (compensation for a change in surface reflectance) was tested theoretically by computing cone contrasts and by asymmetric matching experiments. The effect of a thin achromatic line (a frame) around the test sample was tested empirically. When the samples were outlined by the frame, lightness constancy was increased and chromatic constancy reduced (p<0.001). Changes in luminance are more likely to be compensated when the luminance contrast edge around the test stimulus is disturbed as with the addition of an achromatic frame.
I J
IJ
Murray
A
A
Daugirdiene
A
A
Panorgias
R
R
Stanikunas
J J
JJ
Kulikowski
J M F
JM
Kelly
D000328:Adult; D015350:Contrast Sensitivity; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D008875:Middle Aged; D017949:Retinal Cone Photoreceptor Cells / Q000166:cytology*