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Distributed current analyses of bi-hemispheric magnetic N1m responses to ipsi/contralateral monaural stimuli from a single subject

Singh, Krish Devi, Ioannides, A. A., Gray, N., Kober, H., Pongratz, H., Daun, A., Grummich, P. and Vieth, J. 1994. Distributed current analyses of bi-hemispheric magnetic N1m responses to ipsi/contralateral monaural stimuli from a single subject. Electroencephalography and Clinical Neurophysiology/Evoked potentials 92 (4) , pp. 365-368. 10.1016/0168-5597(94)90104-X

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Abstract

Magnetoencephalographic (MEG) responses of both auditory cortices to simple auditory stimuli presented monaurally to either ear were recorded from a single subject. A distributed current model and a current dipole model were used to analyse the responses at the latency of the dominant N1m complex. At the N1m the current density was localised to a single area and was consequently well modelled by a single current dipole close to the peak current density. In the left hemisphere, the contralateral response (as identified by the peak current density) preceded the ipsilateral response by 3 msec. This value was 7 msec for the right hemisphere. Evidence was found in the right hemisphere of a posterior-anterior movement along the sylvian fissure. Also, the left hemisphere N1m sources were all represented more posterior than the right hemisphere N1m sources.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Magnetoencephalogram (MEG); Distributed current analysis; Equivalent current dipoles; Auditory evoked N1m responses
Publisher: Elsevier
ISSN: 0168-5597
Last Modified: 04 Jun 2017 04:24
URI: http://orca-mwe.cf.ac.uk/id/eprint/38205

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