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Cerebrovascular Response to Cognitive Tasks and Hyperventilation Measured by Multi-Channel Near-Infrared Spectroscopy

Received January 30, 2002; revised July 3, 2002; accepted July 11, 2002. From the Kawaguchi Hospital, Saitama, Japan; Laboratory for Molecular Dynamics of mental Disorders, Brain Science Institute, RIKEN, Saitama, Japan; Department of Psychiatry, JR Tokyo General Hospital, Tokyo, Japan; Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Tokyo, Japan. Address correspondence to Dr. Akira Watanabe, Kawaguchi Hospital, Saitama, Japan. 6-17-34 Nishikawaguchi, Kawaguchi, Saitama 332-0021, Japan; awatanab-tky{at}umin.ac.jp (E-mail).

We assessed the cerebral blood volume response in the bilateral frontal area in 10 healthy subjects during the design fluency task, verbal fluency task, and hyperventilation measured by 24-channel near-infrared spectroscopy. Oxygenated and total hemoglobin increased during the design fluency task and verbal fluency task and decreased during hyperventilation bilaterally, while deoxygenated hemoglobin did not change. The test-retest reliability examined in five subjects was acceptable to assess the cerebrovascular response to cognitive tasks and hyperventilation.

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