2006-07-15, English, Article, Journal or magazine article edition: Mechanisms of evoked and induced responses in MEG/EEG. David, Olivier; Kilner, James M.; Friston, Karl J.

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Physical Description
  • Magazine/​Journal article
Published
  • Elsevier B.V., 2006 July 15
Language
  • English

Edition details

Title
  • Mechanisms of evoked and induced responses in MEG/​EEG.
Appears In
  • Neuroimage, v.31, no.4, 2006 July 15, p.1580(12) (ISSN: 1053-8119)
Author
  • David, Olivier
  • Kilner, James M.
  • Friston, Karl J.
Published
  • Elsevier B.V., 2006 July 15
Physical Description
  • Magazine/​Journal article
Subjects
Target Audience
  • Academic
Summary
  • To link to full-text access for this article, visit this link: http:/​/​dx.doi.org/​10.1016/​j.neuroimage.2006.02.034 Byline: Olivier David, James M. Kilner, Karl J. Friston Abstract: Cortical responses, recorded by electroencephalography and magneto-encephalography, can be characterized in the time domain, to study event-related potentials/fields, or in the time-frequency domain, to study oscillatory activity. In the literature, there is a common conception that evoked, induced, and on-going oscillations reflect different neuronal processes and mechanisms. In this work, we consider the relationship between the mechanisms generating neuronal transients and how they are expressed in terms of evoked and induced power. This relationship is addressed using a neuronally realistic model of interacting neuronal subpopulations. Neuronal transients were generated by changing neuronal input (a dynamic mechanism) or by perturbing the systems coupling parameters (a structural mechanism) to produce induced responses. By applying conventional time-frequency analyses, we show that, in contradistinction to common conceptions, induced and evoked oscillations are perhaps more related than previously reported. Specifically, structural mechanisms normally associated with induced responses can be expressed in evoked power. Conversely, dynamic mechanisms posited for evoked responses can induce responses, if there is variation in neuronal input. We conclude, it may be better to consider evoked responses as the results of mixed dynamic and structural effects. We introduce adjusted power to complement induced power. Adjusted power is unaffected by trial-to-trial variations in input and can be attributed to structural perturbations without ambiguity. Author Affiliation: Wellcome Department of Imaging Neuroscience, Institute of Neurology, 12 Queen Square, London WC1N 3BG, UK Article History: Received 14 March 2005; Revised 19 October 2005; Accepted 13 February 2006
Terms of Use
  • COPYRIGHT 2006 Elsevier B.V.
Language
  • English
Database
  • Gale Academic OneFile
Identifier
  • 194207853

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