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Vision Research 40 (2000) 657675 Luminance processing in apparent motion, Vernier offset and

Summary: Vision Research 40 (2000) 657675
Luminance processing in apparent motion, Vernier offset and
stereoscopic depth
Stuart M. Anstis a
, David R.R. Smith a b,
*, George Mather b
Department of Psychology, Uni6ersity of California San Diego, La Jolla, CA 92093, USA
Department of Experimental Psychology, School of Biological Sciences, Uni6ersity of Sussex, Falmer, Brighton BN1 9QG, UK
Received 6 July 1998; received in revised form 8 February 1999
We obtained (apparently) linear responses to luminance from three special displays of apparent motion, Vernier offset and
stereoscopic depth. In our motion stimulus a dark and a light bar exchanged luminances repetitively on a grey surround. Motion
was attributed to the bar that differed more from the surround, that is, on a dark surround the light bar appeared to jump, and
on a light surround the dark bar appeared to jump. The apparent motion disappeared when the luminance of the surround lay
halfway between that of the bars -- on a linear, not a logarithmic scale. Similar results were obtained for special Vernier offset
and stereo stimuli. These results cannot be explained if all luminances are processed within the same luminance pathway and that
pathway transforms input luminance using non-linear compression. However, the apparent linearity of our results could arise
from opposite and equal non-linearities cancelling out within separate ON- and OFF-spatial luminance pathways. A second set


Source: Anstis, Stuart - Department of Psychology, University of California at San Diego


Collections: Biology and Medicine