Journal
INTERNATIONAL JOURNAL OF NEUROSCIENCE
Volume 118, Issue 5, Pages 657-666Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00207450701242792
Keywords
language processing; left prefrontal cortex; near-infrared spectroscopy; neuroimaging
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Oxygenation changes in the left prefrontal cortex during language processing were assessed with near-infrared spectroscopy (NIRS). Oxyhemoglobin and deoxyhemoglobin concentrations at the Fp1 site during 5 min of resting with eyes closed (control), followed by 5 min of reading aloud, were monitored. A statistically significant change in the oxyhemoglobin concentration was observed by NIRS in all the subjects after execution of the experimental task. The observations of hyper-oxygenation as well as hypo-oxygenation in the present investigation extend past studies and suggest a complex phenomenon of activation that may be the result of a vascular steal mechanism, attenuated activation baselines, or active cortical deactivation.
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