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Assessment of Stimulus-Induced Changes in Human V1 Visual Field Maps

¹Departments of Applied Physics and ⁴Psychology, Stanford University, Stanford, California; ²Department of Psychology, Royal Holloway, University of London, Surrey, United Kingdom; and ³Graduate School of Letters, Kyoto University, Kyoto, Japan

Submitted 24 May 2006; accepted in final form 8 September 2006

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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