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Neuro-Ophthalmology Volume 31, 2007 - Issue 5-6
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Original Article

Functional Distribution in Area V1 Revealed by Spatially Uniform Stimuli

Hiroshi Horiguchi Jikei University, School of Medicine, Tokyo, Japan; Department of Ophthalmology, Kanagawa Rehabilitation Hospital, Atsugi, Japan
,
Satoshi Nakadomari Jikei University, School of Medicine, Tokyo, Japan; Department of Ophthalmology, Kanagawa Rehabilitation Hospital, Atsugi, Japan
,
Ayumu Furuta Maeda Ophthalmic Clinic, Aizuwakamatsu, Japan
,
Kunihiro Asakawa Jikei University, School of Medicine, Tokyo, Japan; Division of Sensory and Cognitive Information, Department of Information Physiology, National Institute for Physiological Sciences, Okazaki, Japan
,
Yoichiro Masuda Jikei University, School of Medicine, Tokyo, Japan; Department of Psychology, Stanford University School of Medicine, Stanford, CA
,
Kenji Kitahara Department of Ophthalmology, Jikei University, School of Medicine, Tokyo, Japan
,
Shigeyuki Kan National Institute of Information and Communications Technology, Kobe, Japan
,
Masaya Misaki National Institute of Information and Communications Technology, Kobe, Japan
&
Satoru Miyauchi National Institute of Information and Communications Technology, Kobe, Japan
 show all
Pages 179-185 | Accepted 02 Jun 2007, Published online: 08 Jul 2009
 
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Abstract

We measured responses to pure luminance changes in area V1 using functional magnetic resonance imaging. We fully dilated the subjects' pupils with a mydriatic agent; placed semitransparent, hemispheric covers over the subjects' eyes; and varied luminance levels of stimuli gradually or instantaneously. We found that the profile of cortical responses varied at about 10 degrees of eccentricity on the representation in area V1 despite the use of uniform achromatic stimuli. This variation was possibly caused by differences between response profiles in the central and peripheral zones of the retina. Our results might reflect the functional distribution of retinal ganglion cell projections.

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