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Neuron, Vol. 26, 715724, June, 2000, Copyright 2000 by Cell Press Neural Correlates of Contrast Detection
 

Summary: Neuron, Vol. 26, 715724, June, 2000, Copyright 2000 by Cell Press
Neural Correlates of Contrast Detection
at Threshold
former), a finding attributed to probability summation
between detectors tuned to opposite directions (Watson
et al., 1980; Dobkins and Teller, 1996). In sum, these
Alexander Thiele, Karen R. Dobkins,
and Thomas D. Albright*
*Howard Hughes Medical Institute
The Salk Institute for Biological Studies findings provide strong evidence that directionally se-
lective mechanisms tuned for opposite directions un-La Jolla, California 92037
Department of Psychology derlie the detection of counterphase gratings and further
suggest that such directional mechanisms do not antag-University of California, San Diego
La Jolla, California 92093 onize each another at contrast threshold.
To investigate the neural basis of this perceptual phe-
nomenon, we recorded the responses of single neurons
in macaque area MT (middle temporal visual area), aSummary
region of extrastriate visual cortex known to contain a
high proportion of directionally selective neurons andHuman psychophysical studies have demonstrated
that, for stimuli near the threshold of visibility, detec- thought to play a key role in motion perception. Across

  

Source: Albright, Tom - Vision Center Laboratory, Salk Institute for Biological Studies
Dobkins, Karen R. - Department of Psychology, University of California at San Diego
Thiele, Alexander - School of Biology and Psychology, University of Newcastle upon Tyne

 

Collections: Biology and Medicine