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Vision Res., Vol. 37, No. 11, pp. 14151427, 1997 01997 ElsevierScienceLtd.Allrightsreserved
 

Summary: Pergamon
Vision Res., Vol. 37, No. 11, pp. 14151427, 1997
01997 ElsevierScienceLtd.Allrightsreserved
PII: S0042-6989(96)00299-4 Printedin GreatBritain
0042-6989/97 $17.00 + 0.00
Image Segmentation Enhances Discrimination of
Motion in Visual Noise
LISA J. CRONER,*~THOMAS D. ALBRIGHT*
Received9 March1995;in revisedform28June1996;injinalform2 October1996
The primate visual system uses form.cues--such as hue, contrast polarity, luminance, and texture-
to segment complex retinal images into the constituent objects of the visual scene. We investigated
whether segmentation of dynamic images on the basis of hue, luminance contrast polarity, or
luminance contrast amplitude aids discrimination of motion direction. Human subjects viewed
dynamic displays of randomly positioned dots, in which a variable proportion of the dots moved in
the same direction at the same speed ("signal" dots) while the remaining dots were randomly
displaced ("noise" dots). In agreement with previous reports, we observed a reliable relationship
between the strength of the motion signal and subjects' ability to discriminate motion direction,
enabling the measurement of thresholds for direction discrimination. When signal dots had a
different luminance contrast amplitude than noise dots, direction discrimination performance was
directly related to the relative contrast of the signal dots, demonstrating the importance of

  

Source: Albright, Tom - Vision Center Laboratory, Salk Institute for Biological Studies

 

Collections: Biology and Medicine