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Space representation for eye movements is more contralateral in monkeys than in humans
 

Summary: Space representation for eye movements is more
contralateral in monkeys than in humans
Igor Kagan, Asha Iyer, Axel Lindner, and Richard A. Andersen1
Division of Biology, California Institute of Technology, Pasadena, CA 91125
Contributed by Richard A. Andersen, March 17, 2010 (sent for review April 8, 2009)
Contralateral hemispheric representation of sensory inputs (the right
visual hemifield in the left hemisphere and vice versa) is a funda-
mental feature of primate sensorimotor organization, in particular
the visuomotor system. However, many higher-order cognitive func-
tions in humans show an asymmetric hemispheric lateralization--
e.g., right brain specialization for spatial processing--necessitating
a convergence of information from both hemifields. Electrophysio-
logical studies in monkeys and functional imaging in humans have
investigated space and action representations at different stages of
visuospatial processing, but the transition from contralateral to
unified global spatial encoding and the relationship between these
encoding schemes and functional lateralization are not fully under-
stood. Moreover, the integration ofdata across monkeys and humans
and elucidation of interspecies homologies is hindered, because
divergent findings may reflect actual species differences or arise from

  

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

 

Collections: Biology and Medicine