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MEG recording from the human ventro-occipital cortex in response to isoluminant color stimulation

Published online by Cambridge University Press:  02 August 2005

ICHIRO KURIKI ,
KENJI SADAMOTO  and
TSUNEHIRO TAKEDA
ICHIRO KURIKI
Affiliation:
Human and Information Science Laboratory, NTT Communication Science Laboratories, Kanagawa, Japan
KENJI SADAMOTO
Affiliation:
Department of Mathematical Engineering and Information Physics, the University of Tokyo, Tokyo, Japan
TSUNEHIRO TAKEDA
Affiliation:
Department of Mathematical Engineering and Information Physics, the University of Tokyo, Tokyo, Japan Department of Complexity Science and Engineering, the University of Tokyo, Tokyo, Japan
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Abstract

In contrast to PET and fMRI studies, color-selective responses from the ventro-occipital area have rarely been reported in MEG studies. We tried to minimize the stimulation to all areas in the visual system except the color-processing ones by using a color space based on psychophysical and physiological knowledge in order to maximize the signal-to-noise ratio for MEG responses from the ventro-occipital area. MEG obtained from long intermittent reversals (2.0–3.5 s) of isoluminant chromatic gratings showed two major peaks at the latencies of approximately 100 and 150 ms. The estimated location of the equivalent-current dipole for response at 100-ms latency was in the calcarine sulcus and that of the dipole for the response at 150 ms was in the collateral sulcus in the ventro-occipital area. The response around 150 ms was uniquely observed in MEG elicited by chromatic reversals. The average of lags between MEG responses from the calcarine sulcus and ventro-occipital area was 43 ms, which suggests sequential processing of color information across the visual cortices.

Keywords

Color visionMEGVentro-occipital cortexCalcarine sulcusTemporal lag
Type
Research Article
Information
Visual Neuroscience , Volume 22 , Issue 3 , May 2005 , pp. 283 - 293
Copyright
2005 Cambridge University Press

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