Afterimage of Perceptually Filled-in Surface: Demos
Shimojo, S., Kamitani, Y., & Nishida, S. (2001) Afterimage
of perceptually filled-in surface. Science 293, 1677-1680.
Afterimage formed by adaptation to the color filling-in configuration
The image below induces perceptual color spreading or filling-in (red square),
even though the stimuli are restricted to the four disk regions. When adapted
to this image, one may observe an afterimage of the perceptually filled-in
surface with an opponent color (global afterimage), as well as those of
pacmen, wedges or disks (local afterimage).
Gaze at the small dot between the pacmen at the bottom.
Click the green button.
Adapt to the image for 30 sec, then it disappears.
Keep fixation, and observe afterimages for about 20 sec.
(This demo may work better under low illumination)
Afterimage of dynamically induced filling-in
Static condition (left): Line segments are presented sparsely and
statically. Their portions in a disk-shaped area are colored blue.
Dynamic condition (right): The same line segments undergo vertical
apparent motion while the disk-shaped area is fixed. This display gives
more vivid impression of color filling-in (disk-shaped surface) than the
static condition. Note also that the duration of local adaptation is shorter
than in the static condition.
Compare the global afterimage (disk-shaped surface) and the local afterimage
(line segments) between these conditions. One may observe the global afterimage
for a longer duration (more vividly), and the local afterimage for a shorter
duration (less vividly) in the dynamic condition than in the static condition.
Perceptual surface segregation and its relevance to distinct afterimages
A. The adaptation stimulus.
B. Phenomenological segregation of surfaces in depth.
C. Afterimages which are corresponding to the surfaces and segregated
in time.
