Somatosensory mechanical response and digit somatotopy within cortical areas of the postcentral gyrus in humans: An MEG study
Article first published online: 16 MAR 2012
Copyright © 2012 Wiley Periodicals, Inc.
Human Brain Mapping
Volume 34, Issue 7, pages 1559–1567, July 2013
How to Cite
Inoue, K., Nakanishi, K., Hadoush, H., Kurumadani, H., Hashizume, A., Sunagawa, T. and Ochi, M. (2013), Somatosensory mechanical response and digit somatotopy within cortical areas of the postcentral gyrus in humans: An MEG study. Hum. Brain Mapp., 34: 1559–1567. doi: 10.1002/hbm.22012
- Issue published online: 14 JUN 2013
- Article first published online: 16 MAR 2012
- Manuscript Accepted: 14 NOV 2011
- Manuscript Revised: 23 AUG 2011
- Manuscript Received: 23 JUN 2010
- Japanese Ministry of Education, Culture, Sports, Science, and Technology. Grant Number: 19791033
- somatosensory evoked fields;
- glabrous skin;
Somatosensory evoked fields in response to compression (termed as Co) and decompression (termed as De) of glabrous skin (D1, thumb; D2, index finger; D5, little finger) were recorded. Although estimated equivalent current dipoles (ECDs) following stimulation of D1 and D5 were larger, but not significantly larger, in decompression than in compression, those of D2 were significantly larger (P = 0.035). The ECDs were located in the postcentral gyrus in the order of D5De, D2De, and D1De medially, posteriorly, and superiorly in decompression but not in compression (z-value, F = 2.692, P = 0.031). The average distance of ECDs between D1 and D5 was longer in decompression (12.8 ± 1.6 mm) than in compression (9.1 ± 1.6 mm). Our data suggest that the cortical response for the commonly used digit D2 is functionally different from those for other digits (D1 and D5) that the somatotopic variability is greater in compression. Hum Brain Mapp, 2013. © 2012 Wiley Periodicals, Inc.