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Journal of Biomedical Optics

Changes in hemoglobin concentration in the lateral occipital regions during shape recognition: a near-infrared spectroscopy study
Author(s): Goro Maehara; Shuichiro Taya; Haruyuki Kojima
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Paper Abstract

By using near-infrared spectroscopy (NIRS), we measured the changes in the oxygenated and deoxygenated hemoglobin (oxy-Hb and deoxy-Hb, respectively) concentrations while performing visual tasks. We conducted experiments using two tasks: a shape recognition task and a position recognition task. It was found that the oxy-Hb concentration was substantially higher in the lateral occipital regions during shape recognition than during position recognition. The changes in the oxy-Hb concentration were considered to reflect the activation difference between the two tasks. No difference was observed in the oxy-Hb concentration during the memorization of shape and memorization of position. The deoxy-Hb concentration was different between the two tasks only when different stimuli were used but not when identical stimuli were used. In addition, it was suggested that the deoxy-Hb concentration is more sensitive to activation difference between the hemispheres and the activation at some regions. Measurements of the oxy-Hb and deoxy-Hb concentrations would reflect different aspects of cortical activations. The present results showed that measuring the oxy-Hb and deoxy-Hb concentrations separately can differentiate the activation of the regional cortical functions.

Paper Details

Date Published: 1 November 2007
PDF: 8 pages
J. Biomed. Opt. 12(6) 062109 doi: 10.1117/1.2815720
Published in: Journal of Biomedical Optics Volume 12, Issue 6
Show Author Affiliations
Goro Maehara, Kanazawa Univ. (Japan)
Shuichiro Taya, Kanazawa Univ. (Japan)
Haruyuki Kojima, Kanazawa Univ. (Japan)

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