Neuromagnetic signals associated with number comparison task

• Published in: IEEE transactions on magnetics Vol. 38; no. 5; pp. 3350 - 3352
• Main Authors: Hiwaki, O., Takae, S., Hashizume, A., Kurisu, K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Arithmetic; Biological and medical sciences; Brain; Fingers; Investigative techniques, diagnostic techniques (general aspects); Lesions; Magnetic resonance imaging; Magnetism; Magnetoencephalography; Magnetometers; Medical imaging: general; Medical sciences; Miscellaneous. Technology; Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques; Positron emission tomography; Radiation therapy equipment; Superconducting devices; Superconducting filters; Equivalent current dipole; Magnetoencephalography; magnetoencephalog raphy; mental calculation; Medical imagery; number comparison; Experimental study; Medical application; Brain (vertebrata); Medical signal processing
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2002.802308

The present study attempted to specify the brain regions involved in a number comparison task by magnetoencephalography (MEG) measurement. Five normal subjects were required to see a pair of random digits displayed for 1.0 s and to judge which digit was larger. Neuromagnetic measurements were carried out with a whole-scalp 204 planar superconducting quantum device magnetometer. We estimated the location of single equivalent current dipoles (ECDs) in the comparison task. The ECDs related to the number comparison task were estimated in the vicinity of the superior parietal lobule of the left hemisphere at the latency of 254.8 /spl plusmn/ 18.9 ms.