Abstract
The aim of this study was to test source modeling strategies for EEC-data from a clinical group of amputees. The experimental conditions (measuring time, age and condition of the patients) resulted in low quality EEC-data. Noise reduction was achieved by a principal component analysis (PCA) and a multiple signal classification (MUSIC). A comparison of the results of these two methods with traditional signal handling yielded superior results for the MUSIC algorithm.
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Achim, A., Richter, F. and Saint-Hilaire, J. Methods for separating temporally overlapping sources of neuroelectric data. Brain Topography, 1988, 1: 22–28.
Barrie, J.M., Freeman, W.J. and Lenhart, M.D. Spatiotemporal analysis of periform, visual, auditory and somesthetic surface EEGs in trained rabbits. J. Neurophys., 1996, 76: 520–539.
Baumgartner, C., Doppelbauer, A., Sutherling, W.W., Lindinger, G., Levesque, M.f., Aull, S., Zeitlhofer, J. and Deecke, L. Somatotopy of human hand somatosensory cortex as studied in scalp EEG. Electroenceph. clin. Neurophysiol., 1993, 88: 271–279.
Birbaumer, N., Lutzenberger, W., Montoya, P., Larbig, W., Unertl, K., Töpfner, S., Grodd, W., Taub, E. and Flor, H. Effects of regional anesthesia on phantom limb pain are mirrored in changes in cortical reorganization. J. Neurosci., 1997, 17: 5503–5508.
Buchner, H., Fuchs, M., Wischmann, H.-A., Dössel, O., Ludwig, I., Knepper, A. and Berg, P. Source analysis of median nerve and finger stimulated somatosensory evoked potentials: Multichannel simultaneous recording of electric and magnetic fields combined with 3D-MR tomography. Brain Topography, 1994, 6: 299–310.
Cuffin, B.N. and Cohen, D. Comparison of the magnetoencephalogram and electroencephalogram. Electroenceph. clin. Neurophysiol., 1979, 47: 132–146.
Desmedt, J.E., Tran Huy, N. and Bourguet, M. The cognitive P40, N60 and P100 components of somatosensory evoked Potentials and the earliest electrical signs of the sensory processing in man. Electroenceph. clin. Neurophysiol., 1983, 56: 272–282.
Elbert, T., Flor, H., Birbaumer, N., Knecht, S., Hampson, S., Larbig, W. and Taub, E. Extensive reorganization of the somatosensory cortex in adult humans after nervous system injury. Neuroreport, 1994, 5: 2593–2597.
Elbert, T., Junghoefer, M., Scholz, B. and Schneider, S. The separation of overlapping neuromagnetic sources in first and second somatosensory cortices. Brain Topography, 1995, 7: 275–282.
Flor, H., Elbert, T., Knecht, S., Wienbruch, C., Pantev, C., Birbaumer, N., Larbig, W. and Taub, E. Phantom limb pain as a perceptual correlate of massive cortical reorganization in upper limb amputees. Nature, 1995, 357: 482–484.
Flor, H., Rudy, T.E., Birbaumer, N., Streit, B. and Schugens, M.M. Zur anwendbarkeit des West Haven-Yale multidimensional pain inventory im deutschen sprachraum. Der Schmerz, 1990, 4: 82–87.
Flor, H., Braun, C., Elbert, T. and Birbaumer, N. Extensive reorganization of primary somatosensory cortex in chronic back pain patients. Neurosci. Letters, 1997, 224: 5–8.
Forss, N., Hari, R., Salmelin, R., Ahonen, A., Haemaelaeinen, M., Kajiola, M., Knuutila, J. and Simola, J. Activation of the human posterior parietal cortex by median nerve stimulation. Exp. Brain Res., 1994, 99: 309–315.
Forss, N., Salmelin, R. and Hari, R. Comparison of somatosensory evoked fields to airpuff and electric stimuli. Electroenceph. clin. Neurophysiol., 1994, 92: 510–517.
Franssen, H., Stegeman, D.F., Moleman, J. and Schoobaar, R.P. Dipole modelling of median nerve SEPs in normal subjects and patients with small subcortical infarcts. Electroenceph. clin. Neurophysiol., 1992, 84: 401–417.
Hari, R., Reinikainen, K., Kaukoranta, E., Haemaelaeinen, M., Ilmoniemi, R., Penttinen, A., Salminen, J. and Teszner, D. Somatosensory evoked cerebral magnetic fields from SI and SII in man. Electroenceph. clin. Neurophysiol., 1984, 57: 254–263.
Hari, R., Karhu, J., Haemaelaeinen, M., Knuutila, J., Salonen, O., Sams, M. and Vilkman, V. Functional organization of the human first and second somatosensory cortices: a neuromagnetic study. J. Neurosci., 1993, 5: 724–734.
Hari, R. Human cortical functions revealed by magnetoencephalography. In: F. Bloom, (Ed.), Progress in Brain Research. Elsevier, Amsterdam, 1994: 163–168.
Kaas, J.H., Nelson, R.J., Sur, M. and Merzenich, M.M. Multiple representation of the body within the primary somatosensory cortex of primates. Science, 1979, 204: 521–523.
Kerns, R.D., Turk, D.C. and Rudy, T.E. The West Haven-Yale Multidimensional Pain Inventory (WHYMPI). Pain, 1985, 23: 345–356.
Mosher, J.C., Lewis, P.S. and Leahy, R.M. Multiple dipole modeling and localization from spatio-temporal MEG data. IEEE Trans. Biomedical Eng., 1992, 39: 541–557.
Mosher, J.C., Leahy, R.M. and Lewis, P.S. Coherence and MUSIC in biomagnetic source localization. In: C. Baumgartner, L. Deecke, G. Stroink and S.J. Williamson (Eds.), Biomagnetism: Fundamental Research and Clinical Applications. Elsevier-IOS Press, Amsterdam, 1995: 330–334.
Valdes, P., Bosch, J., Grave, R., Hernandez, J., Riera, J., Pascual, R. and Biscay, R. Frequency domain models of the EEG. Brain Topography, 1992, 4: 309–319.
Yang, T.T., Gallen, C.C., Schwartz, B.J. and Bloom, F.E. Noninvasive somatosensory homunculus mapping in humans by using a large-array biomagnetometer. Proc. Natl. Acad. Sci., 1993, 90: 3089–3102.
Yang, T.T., Gallen, C.C., Schwartz, B.J. and Bloom, F.E. Sensory maps in the human brain. Nature, 1994, 368: 592–593.
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Mühlnickel, W., Lutzenberger, W. & Flor, H. Localization of Somatosensory Evoked Potentials in Primary Somatosensory Cortex: A Comparison Between PCA and MUSIC. Brain Topogr 11, 185–191 (1999). https://doi.org/10.1023/A:1022277611252
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DOI: https://doi.org/10.1023/A:1022277611252