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Eye Position Signal Modulates a Human Parietal Pointing Region during Memory-Guided Movements
 

Summary: Eye Position Signal Modulates a Human Parietal Pointing Region
during Memory-Guided Movements
Joseph F. X. DeSouza,1 Sean P. Dukelow,1 Joseph S. Gati,3 Ravi S. Menon,3 Richard A. Andersen,4 and
Tutis Vilis2
1Graduate Program in Neuroscience, Siebens-Drake Research Institute and 2 Department of Physiology and
Ophthalmology, University of Western Ontario, London, Ontario, Canada N6G 2V4, 3Advanced Imaging Labs, The John P.
Robarts Research Institute, London, Ontario, Canada N6A 5K8, and 4Division of Biology, California Institute of Technology,
Pasadena, California 91125
Using functional magnetic resonance imaging, we examined the
signal in parietal regions that were selectively activated during
delayed pointing to flashed visual targets and determined
whether this signal was dependent on the fixation position of the
eyes. Delayed pointing activated a bilateral parietal area in the
intraparietal sulcus (rIPS), rostral/anterior to areas activated by
saccades. During right-hand pointing to centrally located targets,
the left rIPS region showed a significant increase in activation
when the eye position was rightward compared with leftward. As
expected, activation in motor cortex showed no modulation
when only eye position changed. During pointing to retinotopi-
cally identical targets, the left rIPS region again showed a signif-

  

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

 

Collections: Biology and Medicine