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Motion Mechanisms in Macaque MT Bart Krekelberg and Thomas D. Albright

Summary: Motion Mechanisms in Macaque MT
Bart Krekelberg and Thomas D. Albright
Howard Hughes Medical Institute, Systems Neurobiology Laboratories, Salk Institute for Biological Studies, La Jolla, California
Submitted 6 May 2004; accepted in final form 26 November 2004
Krekelberg, Bart and Thomas D. Albright. Motion mechanisms in
macaque MT. J Neurophysiol 93: 2908­2921, 2005. First published
December 1, 2004; doi:10.1152/jn.00473.2004. The macaque middle
temporal area (MT) is exquisitely sensitive to visual motion and there
is a large amount of evidence that neural activity in MT is tightly
correlated with the perception of motion. The mechanisms by which
MT neurons achieve their directional selectivity, however, have re-
ceived considerably less attention. We investigated the motion­en-
ergy model as a description of motion mechanisms in macaque MT.
We first confirmed one of the predictions of the motion­energy
model; macaques--just like humans--perceive a reversed direction of
motion when a stimulus reverses contrast with every displacement
(reverse-phi). This reversal of perceived direction had a clear correlate
in the neural responses of MT cells, which were predictive of the
monkey's behavioral decisions. Second, we investigated how multiple
motion­energy components are combined. Psychophysical data have


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


Collections: Biology and Medicine