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J Neurophysiol (September 27, 2006). doi:10.1152/jn.00556.2006
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00556.2006v1
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Submitted on May 24, 2006
Accepted on September 8, 2006

Assessment of stimulus induced changes in human V1 visual field maps

Junjie V Liu1, Hiroshi Ashida2, Andrew T Smith3, and Brian A Wandell4*

1 Applied Physics, Stanford University, Stanford, California, United States
2 Graduate School of Letters, Kyoto University, Kyoto, Japan
3 Psychology, Royal Holloway, University of London, Egham, Surrey, United Kingdom
4 Psychology, Stanford University, Stanford, California, United States

* To whom correspondence should be addressed. E-mail: wandell{at}stanford.edu.

Visual cortex contains a set of field maps in which nearby scene points are represented in the responses of nearby neurons. We tested a recent hypothesis that the visual field map in primary visual cortex (V1) is dynamic, changing in response to stimulus motion direction. The original experimental report replicates, but further experimental and analytical investigations do not support the interpretation of the results. The V1 map remains invariant when measured using stimuli moving in different directions. The measurements can be explained by small and systematic response amplitude differences that arise when probing with stimuli moving in different directions.




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