NDLI: Complex Valued Equivalent-Current Dipole Fits for MEG Responses

Content Provider	IEEE Xplore Digital Library
Author	Yadong Wang Ahmar, N.E. Juanjuan Xiang Ling Ma Poeppel, D. Simon, J.Z.
Copyright Year	2005
Description	Author affiliation: Cognitive Neurosci. of Language Lab., Maryland Univ., College Park, MD (Yadong Wang)
Abstract	Complex numbers appear naturally in biological systems in the context of the Fourier transform. In particular, physiological magnetic field data from whole head magnetoencephalography (MEG) is complex after a Fourier transform. The whole-head MEG steady state response (SSR) to a stationary modulated stimulus results in a complex magnetic field for each MEG channel, from the frequency corresponding to that of the stimulus modulation. This complex data set is used to estimate the neural current sources generating the magnetic field, naturally leading to complex current sources. We show that standard inverse methods of estimating the current sources, such as the single equivalent-current dipole, generalize to complex sources in a useful and straightforward manner. The usage and utility of the complex magnetic field and the complex neural current source are demonstrated using examples from auditory SSR experiments
Starting Page	273
Ending Page	276
File Size	2462249
Page Count	4
File Format	PDF
ISBN	0780387104
DOI	10.1109/CNE.2005.1419610
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-03-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic field measurement Fourier transforms Frequency modulation Current measurement Magnetoencephalography Amplitude modulation Magnetic modulators Steady-state Magnetic fields SQUIDs
Content Type	Text
Resource Type	Article

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