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Changes in hemoglobin concentration in the lateral occipital regions during shape recognition: a near-infrared spectroscopy study

Maehara, Goro, Taya, Shuichiro and Kojima, Haruyuki (2007) Changes in hemoglobin concentration in the lateral occipital regions during shape recognition: a near-infrared spectroscopy study Journal of Biomedical Optics, 12, (6), 062109-[8pp]. (doi:10.1117/1.2815720).

Record type: Article

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.

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Published date: November 2007

Identifiers

Local EPrints ID: 50347
URI: http://eprints.soton.ac.uk/id/eprint/50347
ISSN: 1083-3668
PURE UUID: 30ea1013-c480-416c-b448-6894f6fe0714

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Date deposited: 20 Feb 2008
Last modified: 17 Jul 2017 14:53

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Contributors

Author: Goro Maehara
Author: Shuichiro Taya
Author: Haruyuki Kojima

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