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).
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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.
|Subjects:||Q Science > QP Physiology
B Philosophy. Psychology. Religion > BF Psychology
|Divisions:||University Structure - Pre August 2011 > School of Psychology > Division of Cognition
|Date Deposited:||20 Feb 2008|
|Last Modified:||27 Mar 2014 18:33|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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