遅延対比較課題による誘発脳磁界計測と電源推定

概要

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To investigate the characteristics of short-term memory in the human brain, magnetoencephalograms (MEGs)evoked by a delayed paired comparison task were recorded. A visual stimulus, a circle with a different color in each quadrant, was presented. In the memory task, subjects were requested to move the index finger when the second stimulus (TEST) was identical to the first stimulus (SAMPLE), and the middle finger when it was not identical. In the control task, the subjucts were instructed not to pay attention to the SAMPLE, and to move the index and middle fingers alternately. A slow magnetic activity was observed for between 900 and 1500 ms during the memory task in the occipital region of all subjects. Sources for this slow activity were localized in either the visual cortex and/or the posterior temporal region. The results suggest that these areas may be responsible for retaining the stimulus in visual short-term memory.
社団法人日本磁気学会の論文
1998-04-15