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Cerebral Cortex Advance Access published online on August 18, 2004
Cerebral Cortex, doi:10.1093/cercor/bhh148
© 2004 by Oxford University Press
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Article

Functional Architecture of Retinotopy in Visual Association Cortex of Behaving Monkey

Barbara Heider 1, Gábor Jandó 2, Ralph M. Siegel 1*

1 Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ, USA
2 Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ, USA; Present address: Institute of Physiology, Medical School of Pecs, Hungary

* To whom correspondence should be addressed. E-mail: axon{at}cortex.rutgers.edu.


  Abstract

While the receptive field properties of single neurons in the inferior parietal cortex have been quantitatively described from numerous electrical measurements, the visual topography of area 7a and the adjacent dorsal prelunate area (DP) remains unknown. This lacuna may be a technical byproduct of the difficulty of reconstructing tens to hundreds of penetrations, or may be the result of varying functional retinotopic architectures. Intrinsic optical imaging, performed in behaving monkey for extended periods of time, was used to evaluate retinotopy simultaneously at multiple positions across the cortical surface. As electrical recordings through an implanted artificial dura are difficult, the measurement and quantification of retinotopy with long-term recordings was validated by imaging early visual cortex (areas V1 and V2). Retinotopic topography was found in each of the three other areas studied within a single day's experiment. However, the ventral portion of DP (DPv) had a retinotopic topography that varied from day to day, while the more dorsal aspects (DPd) exhibited consistent retinotopy. This suggests that the dorsal prelunate gyrus may consist of more than one visual area. The retinotopy of area 7a also varied from day to day. Possible mechanisms for this variability across days are discussed as well as its impact upon our understanding of the representation of extrapersonal space in the inferior parietal cortex.

Keywords: extrastriate visual cortex; optical imaging; parietal cortex; spatial perception; visual fields; visual pathways.
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