Information criteria determine the number of active sources

Knosche, T.R. and Berends, E.M. and Jagers, H.R.A. and Peters, M.J. (1996) Information criteria determine the number of active sources. In: 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 31 Oct. - 3 Nov. 1996, Amsterdam, The Netherlands.

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Abstract:	With the neuroelectromagnetic inverse problem, the optimal choice of the number of sources is a difficult problem, especially in the presence of correlated noise. In this paper we present a number of information criteria that help to solve this problem. They are based on the probability density function of the measurements or their eigenvalues. Make use of the Akaike or MDL (minimum description length) correction term and all employ some sort of noise information. By extensive simulations we investigated the conditions under which these criteria yield reliable estimations. We were able to quantify two major factors of influence: (1) the precision of the noise information and (2) the signal-to-noise ratio (SNR). Here defined as the ratio of the smallest signal eigenvalues and the average of the noise eigenvalues. Furthermore, we found that the Akaike correction term tends to overestimate, due to its greater sensibility to the precision of the noise information
Item Type:	Conference or Workshop Item
Copyright:	© 1996 IEEE
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/56014
Official URL:	http://dx.doi.org/10.1109/IEMBS.1996.651992
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