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.
Original language | English |
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Pages (from-to) | 283-293 |
Number of pages | 11 |
Journal | Visual Neuroscience |
Volume | 22 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2005 May 1 |
Externally published | Yes |
Keywords
- Calcarine sulcus
- Color vision
- MEG
- Temporal lag
- Ventro-occipital cortex
ASJC Scopus subject areas
- Physiology
- Sensory Systems