• Masayuki Kamba, Yul-Wan Sung, and Seiji Ogawa.
• Ogawa Laboratories for Brain Function Research, Hamano Life Science Research Foundation, Tokyo, Japan.
• J Magn Reson Imaging. 2007 Dec 1; 26 (6): 1506-13.

PurposeTo determine regional differences in the relationship between neuronal activation and blood oxygenation level-dependent (BOLD) signal changes.Materials And MethodsWe performed BOLD and perfusion-based studies on healthy adult volunteers (40 for BOLD and 20 for perfusion-based studies) with visual stimulation of varied extent in the visual field of subjects.ResultsRegions with a significant negative correlation between the extent of visual stimuli and BOLD and perfusion responses were found bilaterally on the lateral surface of the occipital lobe just anterior to the occipital pole. These regions were located in the border zone between the territories of the middle and posterior cerebral arteries.ConclusionInsufficient perfusion pressure in these regions may have led to attenuation of BOLD and perfusion responses to stimulation of a large portion of the visual field, or a condition in which a large extent of the visual areas was activated in the proximal regions of the territories perfused by the middle and posterior cerebral arteries. This finding supports the hypothesis that regional differences in circulatory condition can result in alterations of the relationship between neuronal activation and BOLD signal changes in the normal human brain.(c) 2007 Wiley-Liss, Inc.

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