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Cerebral Cortex Advance Access published online on December 7, 2007
Cerebral Cortex, doi:10.1093/cercor/bhm221
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Dynamic Properties of the Representation of the Visual Field Midline in the Visual Areas 17 and 18 of the Ferret (Mustela putorius)

Hiroyuki Nakamura1,2, Maximilien Chaumon1,3, Floor Klijn1,4 and Giorgio M. Innocenti1

1 Department of Neuroscience, Karolinska Institutet, S-17177 Stockholm, Sweden, 2 Department of Morphological Neuroscience, Gifu University School of Medicine, Gifu 501-1194, Japan, 3 Laboratoire de Neurosciences Cognitives, Hôpital de la Salpetrière, Paris 75651, France, 4 Department of Biomodeling and Bioinformatics, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands

Address correspondence to Prof. Giorgio M. Innocenti, Department of Neuroscience, Karolinska Institutet, Retzius väg 8, S-17177, Stockholm. Email: Giorgio.Innocenti{at}ki.se.

In mammals, the visual field is split along the midline, each hemisphere representing the contralateral hemifield. We determined that, in the ferret, an 8- to 10-deg-wide strip of visual field near the midline is represented in both hemispheres. Bright squares (1.5 deg) were flashed at different azimuths within the central 20 deg of the visual field. Stimuli were flashed either alone or sequentially, and the responses were analyzed with the voltage-sensitive dye (VSD) RH 795 and/or by recording local field potentials (LFPs). In both VSD and LFP experiments, each stimulus evoked a cortical response field that extended over visual areas 17 and 18 up to a surface of 1–1.5 mm2 and then shrank again. Amplitude of the responses decreased approaching the visual midline and the latency increased. These positional differences are likely to originate from the spatiotemporal structure of the peripheral response fields (PRFs) that form a mosaic in areas 17 and 18, interrupted near the visual midline. Unexpectedly, interhemispheric connections appear not to modify these PRFs’ effects and may not contribute to the responses to discrete, flashed stimuli.

Key Words: corpus callosum • ferret • interhemispheric interactions • visual cortex • visual field


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