基礎心理学研究
Online ISSN : 2188-7977
Print ISSN : 0287-7651
ISSN-L : 0287-7651
Hemodynamic changes in response to the stimulated visual quadrants : A study with 24-channel near-infrared spectroscopy(<Special Edition>Brain Imaging and Psychonomic Science)
Shuichiro TAYAGoro MAEHARAHaruyuki KOJIMA
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2009 年 28 巻 1 号 p. 35-43

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Near-infrared spectroscopy (NIRS) is attracting growing interest as a powerful tool for monitoring cortical activation associated with various psychological phenomena. Many NIRS studies have aimed to explore brain functions associated with visual perception. However, how NIRS can monitor hemodynamic responses in the visual cortex corresponding to stimulation of each visual quadrant is not well known. Here we measured changes in concentration of oxygenated hemoglobin and deoxygenated hemoglobin in the human visual cortex with a 24-ch NIRS instrument. Through individual stimulation of visual quadrants we found that NIRS could differentially monitor activation of the left and right hemisphere when the lower visual field was stimulated, but hardly detected activation of both hemispheres when the upper visual field was stimulated. The result of fMRI scans using the same stimuli suggests that the different measurement responses to upper- and lower visual field stimulation are caused by the differences in the depth from the scalp of the region representing each visual field. On the basis of the present results, we discuss the limitations and potential of NIRS measurements.

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© 2009 日本基礎心理学会
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