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Neural Correlates of Structure-from-Motion Perception in Macaque Alexander Grunewald, David C. Bradley, and Richard A. Andersen
 

Summary: Neural Correlates of Structure-from-Motion Perception in Macaque
V1 and MT
Alexander Grunewald, David C. Bradley, and Richard A. Andersen
Division of Biology, California Institute of Technology, Pasadena, California 91125
Structure-from-motion (SFM) is the perception of three-
dimensional shape from motion cues. We used a bistable SFM
stimulus, which can be perceived in one of two different ways,
to study how neural activity in cortical areas V1 and MT is
related to SFM perception. Monkeys performed a depth-order
task, where they indicated in which direction the front surface of
a rotating SFM cylinder display was moving. To prevent con-
tamination of the neural data because of eye position effects, all
experiments with significant effects of radius, vergence, and
velocity were excluded. As expected, the activity of 50% of
neurons in V1 and 80% of neurons in MT is affected by the
stimulus. Furthermore, the activity of 20% of neurons in area V1
is modulated with the percept. This proportion is higher in MT,
where the activity of 60% of neurons is modulated with the
percept. In both areas, this perceptual modulation occurs only
in neurons with activity that is also affected by the stimulus. The

  

Source: Andersen, Richard - Division of Biology, California Institute of Technology

 

Collections: Biology and Medicine