Hemodynamic change in occipital lobe during visual search: Visual attention allocation measured with NIRS

NEUROPSYCHOLOGIA

卷:48

Article

Kojima, Haruyuki¹  Suzuki, Takeshi¹ 

[1] Kanazawa Univ, Dept Psychol, Kanazawa, Ishikawa 9201192, Japan

关键词: Near Infrared Spectroscopy (NIRS);    Hemoglobin concentration change;    Visual cortex;    Active attention;    Change Blindness;   

DOI  :  10.1016/j.neuropsychologia.2009.09.028

来源: Elsevier

【 摘 要 】

We examined the changes in regional cerebral blood volume (rCBV) around visual cortex using Near Infrared Spectroscopy (NIRS) when observers attended to visual scenes. The oxygenated and deoxygenated hemoglobin (Oxy-Hb and Deoxy-Hb) concentration changes at occipital lobe were monitored during a dual task. Observers were asked to name a digit superimposed on a scenery picture, while in parallel, they had to detect an on-and-off flickering object in a Change Blindness paradigm. Results showed the typical activation patterns in and around the visual cortex with increases in Oxy-Hb and decreases in Deoxy-Hb. The Oxy-Hb increase doubled when observers could not find the target, as opposed to trials in which they could. The results strongly suggest that active attention to a visual scene enhances Oxy-Hb change much stronger than passive watching, and that attention and Oxy-Hb increases are possibly correlated. (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

Free