Functional Constraints Added to an ICA Separating Algorithm: an Example on Magnetoencephalographic Signals

Marco Balsi, Giuseppe Filosa, Roberto Sigismondi, Giancarlo Valente, Giulia Barbati, Filippo Zappasodi, Sara Graziadio, Camillo Porcaro, Franca Tecchio

2005

Abstract

A constraint function expressing a priori information about the structure of data recorded in a MEG experiment is used to bias ICA towards a more realistic decomposition. To do so, a function measuring sensitivity to the stimulation considered is added to the usual contrast function to be optimized. Experiments show that the proposed algorithm effectively succeeds in separating physiologically significant activities that standard ICA fails to distinguish in half of the cases.

References

  1. Hyvärinen, A., Karhunen, J., Oja, E., Independent Component Analysis, Wiley, 2001
  2. Cichocki, A., Amari, S.I., Adaptive Blind Signal and Image Processing, Wiley, 2002
  3. Vigario, R., Sarela, J., Jousmaki, V., Hamalainen, M., Oja, E., Independent component approach to the analysis of EEG and MEG recordings, IEEE Trans. Biomed. Eng. 47 (2000), 589-593
  4. Makeig, S., Bell, A.J., Jung, T.P., Sejnowski, T.J., Independent component analysis of electroencephalographic data, in: M.I. Jordan, M.J. Kearns, S.A. Solla, eds. Advances in neural information processing systems, vol. 8. Cambridge, MA: MIT Press, 1996, 145-51
  5. Barbati, G., Porcaro, C., Zappasodi, F., Rossini, P.M., Tecchio, F., Optimization of ICA approach for artifact identification and removal in MEG signals, Clinical Neurophysiology 115 (2004), 1220-1232
  6. Ikeda, S. , Toyama, K., Independent component analysis for noisy data - MEG data analysis, Neural Networks 13 (2000) 1063-1074
  7. Esposito, F., Formisano, E., Seifritz, E., Goebel, R., Morrone, R., Tedeschi, G., Di Salle, F., Spatial independent component analysis of functional MRI time-series: To what extent do results depend on the algorithm used?, Human Brain Mapping 16 (2002) 146-157
  8. Valente, G., Filosa, G., De Martino, F., Formisano, E., Balsi, M., Optimizing ICA Using Prior Information, in these Proceedings
  9. Balsi, M., Filosa, G., Valente, G., Pantano, P., Constrained ICA for functional Magnetic Resonance Imaging, Proc. of European Conference on Corcuit Theory and Design, Cork, Ireland, Aug. 28-Sep. 1, 2005
  10. Baillet, S., Mosher, J.C., Leahy, R.M., Electromagnetic Brain Mapping, IEEE Signal Processing Magazine, Nov. 2001, 14-30
  11. Debener, S., Makeig, S., Delorme, A., Engel, A.K. , What is novel in the novelty oddball paradigm? Functional significance of the novelty P3 event-related potential as revealed by independent component analysis, Cogn. Brain Res. 22 (2005) 309-21
  12. Tang, A.C., Pearlmutter, B.A., Malaszenko, N.A., Phung, D.B., Independent components of magnetoencephalography: single-trial response onset times, Neuroimage 17 (2002) 1773- 1789
  13. Tecchio, F., Barbati, G., Porcaro, C., Zappasodi, F., Rossini, P.M., Signals from functionally different intra-regional neuronal pools separated by ICA from magnetoencephalographic recordings, submitted to Neuroimage
  14. Tecchio, F., Rossini, P.M., Pizzella, V., Cassetta, E., Romani, G.L., Spatial properties and interhemispheric differences of the sensory hand cortical representation: a neuromagnetic study, Brain Res. 29 (1997) 100-108
  15. http://www.cis.hut.fi/projects/ica/fastica/
Download


Paper Citation


in Harvard Style

Balsi M., Filosa G., Sigismondi R., Valente G., Barbati G., Zappasodi F., Graziadio S., Porcaro C. and Tecchio F. (2005). Functional Constraints Added to an ICA Separating Algorithm: an Example on Magnetoencephalographic Signals . In Proceedings of the 1st International Workshop on Biosignal Processing and Classification - Volume 1: BPC, (ICINCO 2005) ISBN 972-8865-35-X, pages 35-41. DOI: 10.5220/0001196300350041


in Bibtex Style

@conference{bpc05,
author={Marco Balsi and Giuseppe Filosa and Roberto Sigismondi and Giancarlo Valente and Giulia Barbati and Filippo Zappasodi and Sara Graziadio and Camillo Porcaro and Franca Tecchio},
title={Functional Constraints Added to an ICA Separating Algorithm: an Example on Magnetoencephalographic Signals},
booktitle={Proceedings of the 1st International Workshop on Biosignal Processing and Classification - Volume 1: BPC, (ICINCO 2005)},
year={2005},
pages={35-41},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0001196300350041},
isbn={972-8865-35-X},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 1st International Workshop on Biosignal Processing and Classification - Volume 1: BPC, (ICINCO 2005)
TI - Functional Constraints Added to an ICA Separating Algorithm: an Example on Magnetoencephalographic Signals
SN - 972-8865-35-X
AU - Balsi M.
AU - Filosa G.
AU - Sigismondi R.
AU - Valente G.
AU - Barbati G.
AU - Zappasodi F.
AU - Graziadio S.
AU - Porcaro C.
AU - Tecchio F.
PY - 2005
SP - 35
EP - 41
DO - 10.5220/0001196300350041