Sound motion evoked magnetic fields.
OBJECTIVE
The aim of present study was to determine which brain regions are involved in the conscious perception of sound motion in humans.


METHODS
Six kinds of sound stimuli were studied. Two static sound stimuli with durations of 100 or 1000 ms remained at a fixed position during the stimulation period. Four moving sound stimuli with duration of 100 or 1000 ms were moving from left to right, or right to left, during the stimulation period. Evoked magnetic fields were recorded using a 151-channel whole cortex magnetoencephalographic system.


RESULTS
The response identified in all sound stimuli was M100. Responses identified only in moving sound stimuli were M180, M280 and M680. Contour maps and dipoles overlapped on magnetic resonance imaging indicated that both the M100 and M680 responses were generated in the superior temporal cortex (left and right), while M180 and M280 were generated in the parietal cortex (right).


CONCLUSIONS
The results of this MEG study indicated that the right parietal cortex was involved in sound motion processing. We hypothesize that the right parietal cortex, in association with the left and right superior temporal cortex, forms a network to process sound motion information.
Xiang
Jing
J
Department of Diagnostic Imaging, The Hospital for Sick Children, 555 University Avenue, Toronto, Ont., Canada M5G 1X8. jing.xiang@sickkids.ca
Chuang
Sylvester
S
Wilson
Daniel
D
Otsubo
Hiroshi
H
Pang
Elizabeth
E
Holowka
Stephanie
S
Sharma
Rohit
R
Ochi
Ayako
A
Chitoku
Shiro
S
D000161:Acoustic Stimulation; D000328:Adult; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D004574:Electromagnetic Fields; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D015225:Magnetoencephalography; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D010296:Parietal Lobe / Q000502:physiology; D011601:Psychophysics; D013017:Sound Localization / Q000502:physiology*; D013702:Temporal Lobe / Q000502:physiology