Identifying Biomagnetic Sources in the Brain by the Maximum Entropy Approach

Details Identifying Biomagnetic Sources in the Brain by the Maximum Entropy Approach Identifying Biomagnetic Sources in the Brain by the Maximum Entropy Approach

2005-08-29

arxiv.org/abs/q-bio/0508040v1

p. 527 in "Bayesian Inference and Maximum Entropy Methods in Science and Engineering" ed. by K. H. Knuth, A. E. Abbda, R. D. M

Biology

Quantitative Biology

Neurons and Cognition

8 pages, 8 figures. Presented at 25th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and

Scientific paper

10.1063/1.2149834

Magnetoencephalographic (MEG) measurements record magnetic fields generated from neurons while information is being processed in the brain. The inverse problem of identifying sources of biomagnetic fields and deducing their intensities from MEG measurements is ill-posed when the number of field detectors is far less than the number of sources. This problem is less severe if there is already a reasonable prior knowledge in the form of a distribution in the intensity of source activation. In this case the problem of identifying and deducing source intensities may be transformed to one of using the MEG data to update a prior distribution to a posterior distribution. Here we report on some work done using the maximum entropy method (ME) as an updating tool. Specifically, we propose an implementation of the ME method in cases when the prior contain almost no knowledge of source activation. Two examples are studied, in which part of motor cortex is activated with uniform and varying intensities, respectively.

Affiliated with

Also associated with

No associations

Rating

Identifying Biomagnetic Sources in the Brain by the Maximum Entropy Approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Identifying Biomagnetic Sources in the Brain by the Maximum Entropy Approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Identifying Biomagnetic Sources in the Brain by the Maximum Entropy Approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-405142