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Journal of Vision (2005) 5, 525-533 http://journalofvision.org/5/6/4/ 525 Paucity of chromatic linear motion detectors in macaque V1
 

Summary: Journal of Vision (2005) 5, 525-533 http://journalofvision.org/5/6/4/ 525
Paucity of chromatic linear motion detectors in macaque V1
Gregory D. Horwitz
Vision Center Laboratory, The Salk Institute for
Biological Studies, La Jolla, CA, USA
Thomas D. Albright
Vision Center Laboratory, The Salk Institute for
Biological Studies, La Jolla, CA, USA
The motion of a color-defined edge is often more difficult to perceive than the motion of a luminance-defined edge.
Neurons subserving motion vision may therefore be particularly sensitive to luminance contrast. One class of neurons
thought to play a critical role in motion perception is V1 neurons whose spatiotemporal receptive fields are oriented in
space-time. We used the reverse correlation technique to study the relationship between color tuning and space-time
receptive field orientation in V1 neurons of awake, fixating monkeys. Neurons with space-time oriented receptive fields
were tuned almost exclusively for luminance, whereas neurons with nonoriented space-time receptive fields were tuned
for luminance or for color. These results suggest that the special role of luminance contrast in motion perception is due in
part to the establishment of space-time oriented receptive fields among luminance-tuned, but not color-tuned, V1 neurons.
Keywords: color, motion, V1, macaque, space-time receptive field orientation
Introduction
The front end of the "first-order motion system" can be
modeled as a bank of space-time oriented filters that, in

  

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

 

Collections: Biology and Medicine