OBJECTIVE: First, to determine the distribution of the estimated sources of sleep spindles, and alpha and mu rhythms based on whole-head magnetoencephalogram (MEG) recordings; second, to scrutinize the physiological relevance of the dipole fit algorithm in localizing on-going normal rhythmic activities. METHODS: One hundred and fifty-one channels were used to record spontaneous MEG activity during wakefulness and superficial sleep in 4 normal subjects. The equivalent dipolar sources were estimated by a new 'dipole fit algorithm' and projected on the corresponding magnetic resonance images. RESULTS: Equivalent dipoles of MEG spindles were distributed over the centro-parietal region. Those of alpha rhythms were concentrated around the occipito-parietal sulcus and those of mu rhythms were confined to the area around the central sulcus. CONCLUSIONS: MEG sleep spindles, and alpha and mu rhythms have distinct spatial distributions of their equivalent dipolar sources. This demonstrates that various cortical regions that oscillate within the same frequency band have different spatial organizations and different functional aspects.
OBJECTIVE: First, to determine the distribution of the estimated sources of sleep spindles, and alpha and mu rhythms based on whole-head magnetoencephalogram (MEG) recordings; second, to scrutinize the physiological relevance of the dipole fit algorithm in localizing on-going normal rhythmic activities. METHODS: One hundred and fifty-one channels were used to record spontaneous MEG activity during wakefulness and superficial sleep in 4 normal subjects. The equivalent dipolar sources were estimated by a new 'dipole fit algorithm' and projected on the corresponding magnetic resonance images. RESULTS: Equivalent dipoles of MEG spindles were distributed over the centro-parietal region. Those of alpha rhythms were concentrated around the occipito-parietal sulcus and those of mu rhythms were confined to the area around the central sulcus. CONCLUSIONS: MEG sleep spindles, and alpha and mu rhythms have distinct spatial distributions of their equivalent dipolar sources. This demonstrates that various cortical regions that oscillate within the same frequency band have different spatial organizations and different functional aspects.
Authors: Ming-Xiong Huang; Charles W Huang; Ashley Robb; AnneMarie Angeles; Sharon L Nichols; Dewleen G Baker; Tao Song; Deborah L Harrington; Rebecca J Theilmann; Ramesh Srinivasan; David Heister; Mithun Diwakar; Jose M Canive; J Christopher Edgar; Yu-Han Chen; Zhengwei Ji; Max Shen; Fady El-Gabalawy; Michael Levy; Robert McLay; Jennifer Webb-Murphy; Thomas T Liu; Angela Drake; Roland R Lee Journal: Neuroimage Date: 2013-09-19 Impact factor: 6.556
Authors: Erricos M Ventouras; Periklis Y Ktonas; Hara Tsekou; Thomas Paparrigopoulos; Ioannis Kalatzis; Constantin R Soldatos Journal: Comput Intell Neurosci Date: 2010-03-29
Authors: Nima Dehghani; Sydney S Cash; Chih C Chen; Donald J Hagler; Mingxiong Huang; Anders M Dale; Eric Halgren Journal: PLoS One Date: 2010-07-07 Impact factor: 3.240