NDLI: Single evoked somatosensory MEG responses extracted by time delayed decorrelation

Content Provider	IEEE Xplore Digital Library
Author	Sander, T.H. Burghoff, M. Curio, G. Trahms, L.
Copyright Year	1991
Abstract	Measurable magnetoencephalographic responses of the cortex due to an electrical stimulus at the wrist start 20 ms after the stimulus. This early magnetic response is known as the N20m, which can be seen by averaging over hundreds of stimulation epochs. Applying Independent Component Analysis (ICA) based on time-delayed decorrelation to such data allows the extraction of the single responses starting 20 ms after the stimulus without the need for averaging. One of the independent components has a field pattern that is very similar to the N20m. Using this independent component, it is found that the response at 20 ms is stable over a measurement session lasting 4000 s and containing 12000 stimulations, whereas later responses show highly significant changes over time. To suppress slower activity and noise in the data, a high pass of 55 Hz is applied to the data. One of the subsequently calculated independent components shows that the response at 20 ms is much clearer than before filtering. Analyzing the amplitude distribution of this response yields that 97% of the stimulations have a measurable response above base line level, whereas for conventional methods such as projection and notch filtering, only 91% of the responses are detectable. The high degree of measurable responses indicates the signal separation power of independent component analysis, and it supports the hypothesis that the early stages of sensory cortical processing can be described as a linear processing chain with small variability, at least from a macroscopic point of view.
Sponsorship	IEEE Signal Processing Society
Starting Page	3384
Ending Page	3392
Page Count	9
File Size	1294657
File Format	PDF
ISSN	1053587X
Volume Number	53
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay effects Decorrelation Independent component analysis Magnetic separation Filtering Electric variables measurement Wrist Data mining Magnetic field measurement Time measurement temporal decorrelation magnetoencephalography medianus stimulation somatosensory evoked fields
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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