When the images presented to the eyes differ only in their contours,<unk>  is referred to as<unk>  contour<unk> . When the images presented to the eyes differ only in their colours,<unk>  is referred to as<unk>  colour<unk> . When the images presented to the eyes differ only in their lightnesses, a form of<unk>  called<unk>  lustre may be seen. When an image is presented to one eye and a blank field to the other, the image is usually seen continuously. This is referred to as contour dominance. Occasionally however, the blank field, or even the dark field of a closed eye, can become visible, making the image invisible for about as long as it would be invisible were it in<unk>  with another image of equal stimulus strength. When an image is presented to one eye and a blank field to the other, introducing a different image onto the blank field usually results in that image being seen immediately. This is referred to as flash suppression.
Binocular rivalry
Auditory masking
Eyeblink conditioning
Audio-visual entrainment
Smooth pursuit
Burst suppression
Prepulse inhibition
Fusional vergence