Publications | Biomagnetic Imaging Laboratory

Wipf D and Nagarajan SS. A unifiedBayesian framework for MEG/EEG source imaging. Neuroimage44(3):947-66, 2009.
Zhu Z, Zumer JM, Lowenthal ME, Padberg J, Recanzone GH, Krubitzer LA, Nagarajan SS and Disbrow EA. The relationship between magnetic and electrophysiological responses to complex tactile stimuli. BMC Neurosci 10(1):4, 2009.
Dalal S.S., Guggisberg A.G, Edwards E, Sekihara K, ConoltyR, Berger M, Barbaro M, Knight RT, Kirsch HE and Nagarajan S.S., Five-dimensional neuroimaging: Localization of thetime-frequency dynamics of cortical activity, Neuroimage.2008 May 1;40(4):1686-700.
Dalal SS, Edwards E, KirschHE, Barbaro NM, Knight RT and Nagarajan SS. Localization of neurosurgically implanted electrodes via photograph-MRI-radiograph coregistration. J Neurosci Methods 174(1):106-15, 2008.
Hild K.E., Attias H.T., and Nagarajan S.S. An expectation-maximization method for spatio-temporal blind source separation using an ARMOG source model. IEEE Transactions in Neural Networks. 2008Mar;19(3):508-19.
Aliu SO, Houde JF and Nagarajan SS. Motor-induced suppression of the auditory cortex. J Cogn Neurosci, 2008.
Zumer JM, Attias HT, Sekihara K and Nagarajan SS. Probabilistic algorithms for MEG/EEG source reconstruction using temporal basis. Neuroimage 41(3):924-40, 2008.
Nagarajan SS, Findlay A, Honma S, Robinson S, Kirsch H and Berger MS. Preoperative localization of hand motor cortexfrom movement-related ?-band desynchronization of MEGdata. J. Neurosurgery. 2008 Aug;109(2):228-37.
Sekihara K, Hild K, Dalal S.S. and Nagarajan S.S.Performance of prewhitening adaptive beamformer for dualMEG measurements. IEEE Transactions in Biomedical Engineering.2008 Mar;55(3):1112-21.
Sekihara, Kensuke; Nagarajan, Srikantan S. Adaptive SpatialFilters for Electromagnetic Brain Imaging. Series inBiomedical Engineering. Springer Verlag. 2008, XI, 245 p. 62illus., Hardcover. ISBN: 978-3-540-79369-4.
Guggisberg A.G., Kirsch H.E., Mantle M.M., Barbara N.M. and Nagarajan S.S., Fast oscillations associated with interictal spikes localize the epileptogenic zone in patients with partial epilepsy. ,NeuroImage 39:661-668, 2008.
Guggisberg A.G., Honma S.M., Findlay A.M., Dalal S.S., Kirsch H.E., Berger M.S., Nagarajan S.S, Mapping Functional Connectivity in Patients with Brain Lesions, Ann Neurol. 63:193-203, 2008.
Kirsch H, Zhu Z, Findlay A, Honma S, Berger M.S, and Nagarajan S.S, “Predicting the location of mouth motor cortex in brain tumor by using somatosensory evoked field measurements”, J Neurosurg. 2007 Sep;107(3):481-7.
Kirsch H.E, Mantle M, Nagarajan S.S., Concordance between routine interictal MEG and simultaneous scalp EEG in a sample of patients with epilepsy. J Clin Neurophysiol. 2007 Jun;24(3):215-31.
Zumer J.M, Attias H.T, Sekihara K and Nagarajan S.S, “A probabilistic algorithm for interference suppression and source reconstruction from MEG/EEG data”, Neuroimage, 37(1):102-115, 2007.
Hild K.E., Alleve G, Nagarajan S.S., and Comani S., “Performance comparison of six Independent Components Analysis algorithms for fetal signal extraction from real fMCG data”, Phys Med Biol. 2007 Jan 21;52(2):449-62. Epub 2007 Dec 29.
Hild K.E., Attias H.T., Comani S., and Nagarajan S.S., “Fetal cardiac signal extraction from magnetocardiographic data using a probabilistic algorithm”, Signal Processing, 8:1, 1993-2004 Aug 2007.
Nagarajan, S.S., Attias H.T., Hild K.E., Sekihara K., A Probabilistic Algorithm for Robust Interference Suppression in Bioelectromagnetic sensor data, Stat Med. 2007 Sep 20;26(21):3886-910.
Hairston IS and Nagarajan SS, Neural mechanisms of time-order errors, J Cogn Neurosci. 2007 Jul;19(7):1163-74.
Berman, J. Henry, R., Nagarajan S.S. and Berger, M.S., “Accuracy of diffusion tensor MRI tractography assessed with intraoperative subcortical stimulation and magnetic source imaging”, J Neurosurg. 2007 Sep;107(3):488-94.
Zhu Z, Disbrow EA, Zumer JM, McGonigle DJ and Nagarajan S.S, Spatiotemporal integration of tactile information in human somatosensory cortex, BMC Neuroscience, 2007 Mar 14;8(1):21.
Wassenhove V.V and Nagarajan S.S, Auditory cortical plasticity in modulation rate discrimination learning, J. Neuroscience, 2007 Mar 7;27(10):2663-72.
Hinkley L, Nagarajan S.S, Krubitzer L, and Disbrow E. Senorimotor integration in S2, PV, and parietal rostroventral aveas of the human sylvian fissure. J. Neurophysiology, 97:1288-1297, 2007.
Hild K.E, Nagarajan S.S. Source Localization Of Eeg/Meg Data By Correlating Columns Of Ica Solution With Lead Field Matrix, ICASSP 2007.
Putthividya P, Attias H, Nagarajan S.S, Le T, “Probabilistic Graphical Model For Auto-Annotation, Content-Based Retrieval, And Classification Of TV Clips Containing Audio, Video, And Text”, ICASSP 2007.
Hau J, Attias HT, Nagarajan S.S, Le T, “Probabilistic Models for Speech Enhancement with channel gain estimation”, ICASSP 2007.
Wipf, D and Nagarajan S.S, “Beamforming using the Relevance Vector Machine”, Proceedings of International Conference on Machine learning (ICML), 2007.
Sekihara K, Hild K, Dalal S.S., and Nagarajan, S.S., "Performance of prewhitening beamforming in MEG dual experimental conditions," IEEE Engineering in Medicine and Biology Society Conference on Neural Engineering, Kohala Coast, HI, May 2007.
Wipf D., Sekihara K, and Nagarajan S.S., EM Algorithms that generalize MCE and FOCUSS, Conference on Non-invasive Functional Source Imaging, China, October 2007.
Nagarajan, S.S., Portniaguine, O., Hwang, D., Sekihara, K., and Johnson, C., “Controlled minimum-support MEG imaging”, 2006 Nov 15;33(3):878-85, Neuroimage.
Kirsch HE, Robinson SE, Mantle M, Nagarajan S.S. Automated localization of magnetoencephalographic interictal spikes by adaptive spatial filtering, 2006 Oct;117(10):2264-71, Clinical Neurophysiology.
Canolty RT, Edwards E, Dalal SS, Soltani M, Nagarajan S.S, Kirsch HE, Berger MS, Barbaro NM, Knight RT., “High gamma power is phase-locked to theta oscillations in human neocortex”, Science. 2006 Sep 15;313(5793):1626-8.
Heinks-Maldanado T, Nagarajan S.S, Houde JF, “Magnetoencephalographic evidence for a precise forward model in speech production”, 2006 Sep 18;17(13):1375-9. Neuroreport.
Sekihara K, Hild K and Nagarajan S.S, “A novel adaptive beamformer for MEG data when large background brain activity exists”, 2006 Sep;53(9):1755-64, IEEE Transactions in Biomedical Engineering.
Lin P, Berger M and Nagarajan S.S, “Motor field sensitivity for preoperative localization of motor cortex”. Journal of Neurosurgery 105:1-7, 2006.
Dalal S.S, Sekihara K, Nagarajan S.S, “Modified beamformers for suppression of coherent source observed in MEG”, 2006 Jul; 53(7):1357-63., IEEE Transactions in Biomedical Engineering.
Nagarajan, S.S., Attias H.T., Hild K.E., Sekihara K., A Graphical Model for Estimating Stimulus-Evoked Brain Responses in Noisy MEG data with Large Background Brain Activity, Neuroimage. 2006 Apr 1;30(2):400-16. Epub 2005 Dec 19.
Zumer J.M, Attias H.T, Sekihara K and Nagarajan S.S, “Two probabilistic algorithms for MEG/EEG source reconstruction”, ISBI 2006.
Hild K.E., Attias H.T., and Nagarajan S.S., “An EM method for spatiotemporal blind source separation using an ARMOG source model ”, ICA Conference, 2006.
Nagarajan S.S., Attias H.T., Hild K.E., Sekihara K., “Partitioned Factor Analysis for Interference Suppression and Source Extraction”, ICA Conference, 2006 pp. 189-197.
Nagarajan S.S, Attias H.T, Hild K.E, and Sekihara K., “Stimulus Evoked Independent Factor Analysis of MEG Data”, Advances in Neural Information Processing Systems, 2005.
Sekihara, K., Nagarajan, S.S., Sahani M., “A simple non-parametric methods for estimating statistical significance of MEG beamformer images”, Neuroimage. 2005 Aug 15;27(2):368-76.
Cheung, S., Nagarajan, S.S., Schreiner, C.S, Bedenbaugh, P., and.Wong A, "Plasticity in Primary Auditory Cortex of Monkeys with Altered Vocal Production", J Neurosci. 2005 Mar 9;25(10):2490-503.
Bénédicte P, Beitel R.E, Nagarajan S.S, Bonham B, Schreiner C.E, Cheung S.W, “Functional organization and hemispheric comparison of primary auditory cortex in the common marmoset (Callithrix jacchus)”, J Comp Neurol. 2005 Jul 11;487(4):391-406.
Sekihara, K., Sahani M., Nagarajan, S.S. “Location Bias and Spatial Resolution in Adaptive and Non-adaptive Spatial Filters for Magnetoencephalography”, Neuroimage. 2005 May 1;25(4):1056-67 .
Sekihara K., Nagarajan S. S., Separation of Phase-Locked and Non-Phase-Locked Activities Using Empirical Null-Distributions Obtained from Randomized Plus/Minus Averagings of Event-Related Epochs, Proceeding of International Conference for Bioelectromagnetism and Brain Electromagnetic Tomography, 2005.
K. Sekihara, K. Hild, S. S. Nagarajan, Influence of High-Rank Background Interference on Adaptive Beamformer Source Reconstruction, Proceeding of International Conference for Bioelectromagnetism and Brain Electromagnetic Tomography, 2005.
Robinson S.E, Nagarajan S.S, Mantle M, Gibbons V, Kirsch H., Localization of interictal spikes using SAM(g2) and dipole fit, Neurol Clin Neurophysiology, Nov 30:74, 2004.
Dalal, S.S., Agrawal, V., Zumer, J.M., Sekihara, K., Nagarajan, S.S., NUTMEG: A magnetic source imaging toolbox, Neurol Clin Neurophysiol. 2004 Nov 30;2004:52.
Henry R.G, Berman J.I, Nagarajan S.S, Mukherjee P, and Berger M.S, “Sub-cortical pathways serving cortical language sites: Initial experience with diffusion tensor imaging fiber tracking combined with intraoperative language mapping”, Neuroimage. 2004 Feb;21(2):616-22.
Sekihara, K., Nagarajan, S.S., Poeppel, D., and Marantz, A., “Asymptotic SNR of Scalar and Vector Minimum Variance Beaformers for Neuromagnetic Source Reconstruction”, 2004 Oct;51(10):1726-34., IEEE Transactions in Biomedical Engineering.
Sekihara, K., Nagarajan, S.S., Poeppel, D., and Marantz, A., “Performance of an MEG Adaptive-Beamformer Source Reconstruction Technique in the Presence of Additive Low-Rank Interferences”, IEEE Trans Biomed Eng. 2004 Jan;51(1):90-9.
Sekihara K, Sahani M, Nagarajan S.S., Bootstrap-Based Statistical Thresholding For Meg Source Reconstruction Images, IEEE-EMBS, San Francisco, 2004.
Byl N.N, Nagarajan S.S and McKenzie A.L, Effects of Sensory Discrimination Training on Structure and Function in Patients with Focal Hand Dystonia: A case series, Arch Phys Med Rehabil. 2003 Oct;84(10):1505-14.
Sahani M, and Nagarajan S.S, “Reconstructing correlated sources from MEG data”, Advances in Neural Information Processing, 2003.
Blomgren, M., Nagarajan, S.S., Lee, J., Li, T., Preliminary results of a functional MRI study of brain activation patterns in stuttering and nonstuttering speakers during a lexical access task. J Fluency Disord. 2003 Winter; 28(4):337-55.
McKenzie, A., Nagarajan, S.S., Byl, N., Roberts, T.P.L. and Merzenich, M.M., “Somatosensory representation of digits and performance: patients with Focal Hand Dystonia”, Am J Phys Med Rehabil. 2003 Oct;82(10):737-49.
Hsu, K., Nagarajan S.S and Durand, D.M., “Analysis of efficiency of magnetic stimulation”, IEEE Transactions in Biomedical Engineering, 2003 Nov;50(11):1276-85.
Hwang D., Nagarajan S.S., Portniaguine O., and Sekihara K.. Multiresolution MEG (magnetoencephalography) imaging by adaptive beamformer. In IEEE EMBS Conference, 2003.
Hwang D., Nagarajan S.S., Portniaguine O., and Sekihara K.. Fast beamformer MEG (magnetoencephalography) imaging by adaptive scanning, Medical Image Computing and Computer Assisted Intervention, 2003.
Hwang D., Nagarajan S.S., Portniaguine O., Johnson, C. and K. Sekihara. Minimum support MEG (magnetoencephalography) imaging for source localization: Study on effects of noise, discretization, depth, and separation of multiple sources. In World Congress On Medical Physics and Biomedical Engineering, 2003.
Byl N.N, Nagarajan S.S, Merzenich M.M, Roberts T, McKenzie A. Correlation of clinical neuromusculoskeletal and central somatosensory performance: variability in ontrols and patients with severe and mild focal hand dystonia. Neural Plast. 2002;9(3):177-203.
Blake D.T., Byl N.N., Cheung S, Bedenbaugh P, Nagarajan S.S, Lamb M, Merzenich M. Sensory representation abnormalities that parallel focal hand dystonia in a primate model. Somatosens Mot Res. 2002;19(4):347-57.
Sekihara, K., Nagarajan, S.S., Poeppel, D., and Marantz, A., “Performance of an MEG Adaptive-Beamformer Technique in the Presence of Correlated Neural Activities: Effects on Signal Intensity and Time-Course Estimates”, vol 40, No. 10, 1534-1546, IEEE Transactions in Biomedical Engineering, 2002.
Houde, J., Nagarajan, S.S. and Merzenich, M.M., “Modulation of auditory cortex during speech: an MEG study”, J. Cognitive Neuroscience (First two authors contributed equally to this work), Nov 15;14(8):1125-38, 2002.
Nagarajan, S.S., Cheung, S.W., Bedenbaugh, P., Beitel, R.E., Schreiner, C.E. and Merzenich, M.M., “Representation of spectral and temporal envelope degradations of twitter vocalizations in primary auditory cortex of the common marmoset”, J Neurophysiology, 87(4):1723-37, 2002.
Sekihara, K., Nagarajan, S.S., Poeppel, D., Marantz, A., and Miyashita, Y., “Application of MEG Eigenspace beamformers to reconstructing spatiotemporal activities from neural sources”, Human Brain Mapping, 15(4):199-215, 2002.
Nagarajan, S.S., “Successive signal representation in noise in dyslexics”, Clinical Neurophysiology, Apr;113(4):459-61, 2002.
Portniaguine, O., Nagarajan, S.S., Hwang, D., Sekihara, K., and Johnson, C., “Minimum-support MEG imaging”, International Conference in Bioelectromagnetism, Montreal 2002.
Nagarajan, S.S., Portniaguine, O., Hwang, D., Sekihara, K., and Johnson, C., “Performance of a minimum-support MEG imaging”, IEEE EMBS-BMES Conference, Houston 2002.
Sekihara, K., Nagarajan, S.S., Poeppel, D., and Marantz, A., “Performance of adaptive vector beamformers”, International Society for Brain Imaging (ISBI) 2002.
Poldrack, R.A., Temple, E., Protopapas, A., Nagarajan, S.S., Tallal, P., Merzenich, M. M., Gabrieli, J. D. E., “ Relation between the neural bases of rapid acoustic comprehension, and phonological processes in reading: Evidence from fMRI”, J Cogn Neurosci., Jul 1;13(5):687-97, 2001.
Cheung, S., Bedenbaugh, P., Nagarajan S.S., and Schreiner, C.S. "Functional Organization of Squirrel Monkey Primary Auditory Cortex: Responses to Pure Tones ", J. Neurophysiology, 85(4): 1732-49, 2001.
Cheung, S., Nagarajan, S.S., Bedenbaugh, P., Schreiner, C.S., Wang, X and Wong, A., "Auditory cortical neuron response differences under isoflurane versus pentobarbital anesthesia ", Hearing Research, 156:115-117, 2001.
Sekihara, K., Nagarajan, S.S., Poeppel, D., Marantz, A., and Miyashita, Y., “Reconstructing spatiotemporal activities of neural sources using an MEG vector beamformer technique”, IEEE Transactions in Biomedical Engineering, 48(7): 760-771, 2001.
Ahissar, E., Nagarajan S.S., Ahissar, M., Protopapas, A., Mahncke, H. and Merzenich, M.M. “Speech comprehension is correlated with temporal response patters from auditory cortex”, Proc Natl Acad Sci U S A., Nov 6;98(23):13367-72, 2001.
Sekihara, K., Nagarajan, S.S., Poeppel, D., Marantz, A., and Miyashita, Y., “Reconstructing spatiotemporal activities of neural sources using an MEG vector beamformer”, ICASSP, 2001.
Blomgren, M., Nagarajan, S.S., Lee, J. and Tianhao, L., “Influence of speech task complexity on brain activation patterns in stutterers and non-stutterers”, ASHA, 2001.
Temple E., Gabrieli J.D.E., Protopapas A., Nagarajan S.S., Salz T., Tallal P., Merzenich M. M., & Poldrack R. A., “Disruption of the Neural Response to Rapidly Transient Acoustic Stimuli in Dyslexia: Evidence from fMRI”, v97 (25), 13907-12, PNAS, 2000.
Byl, N.N., A. McKenzie, Nagarajan, S.S., “Differences in somatosensory hand organization in a healthy flutist and a flutist with focal hand dystonia: a case report.” J Hand Therapy 13(4): 302-9, 2000.
Sekihara, K., Nagarajan, S.S., Poeppel, D., Miyashita, Y., “Estimating neural sources from each time-frequency component of magnetoencephalographic data", IEEE Transactions in Biomedical Engineering, v47, 5, 642-53, 2000.
Houde, J.F., Nagarajan, S.S., and Merzenich, M.M. Modulation of Auditory Cortex during Speech: An MEG Study. 5th Seminar on Speech Production: Models and Data, Kloster Seeon, Germany., 2000.
Sekihara, K., Nagarajan, S.S., Poeppel, D., Miyashita, Y., "Time-frequency MEG-MUSIC Algorithm", IEEE Transactions in Medical Imaging, Jan;18(1):92-7, 1999.
Nagarajan, S.S., Mahncke, H.M., Salz, T, Tallal, P, Roberts, T.P.L., and Merzenich, M.M., "Cortical auditory signal processing in poor-readers", PNAS, May 25; 96(11):6483-8, 1999.
Nagarajan, S.S., and Houde, J., “Modulation of cortical magnetic field responses to speech sounds”, Proceedings of the IEEE-EMBS-BMES Conference, Atlanta, 1999.
Nagarajan, S.S., Blake, D.T., Wright, B.A., Byl, N. and Merzenich, M.M., "Practice-related improvements in somatosensory interval discrimination exhibits temporal specificity but generalizes across skin location, hemisphere and modality", J. Neuroscience, 18(4), 1559-70, 1998.
Nagarajan S.S., Wang X., Schreiner C.S., Merzenich M.M., Johnston P.J., Miller S.L. and Tallal P., "Speech modification algorithms used for training language-learning impaired children", IEEE Transactions in Rehabilitation Engineering, Sep;6(3):257-68, 1998.
Maccabee, P., Nagarajan, S.S., Amassian, V.E., Durand, D.M., Eberle, L., Cracco, R.Q. and Lai, K.S., “Optimal polarity sequence for exciting peripheral nerve with neuromagnetic stimuli:In-vitro studies and computer simulations”, Journal of Physiology (London), Dec 1;513 ( Pt 2):571-85. 1998.
Sekihara, K., Nagarajan, S.S., Poeppel, D., Miyauchi, S., Takino, R., Fujimaki, N., and Miyashita, Y., " Estimating Neural Sources from Time-frequency components of MEG Data", IEEE-SP Symposium on Time-frequency and Time-scale analysis, 1998.
Nagarajan S.S. and Durand, D. “Mapping the location of excitation during in-vitro magnetic stimulation”, Annals of Biomedical Engineering, 25 (1), 112-125, 1997.
Nagarajan, S.S., Mahncke, H.M., Poeppel, D., Rowley, H. and Merzenich, M.M., "Spatio-temporal interaction of evoked magnetic fields in primary auditory and somatosensory cortices of awake humans", Proceedings of the IEEE-EMBS conference, Chicago, 1997.
Byl, N.N., Merzenich, M.M., Cheung, S., Bedenbaugh, P., Nagarajan, S.S., Jenkins, W.M., "A primate model for studying focal dystonia and repetitive strain injury: effect on the primary somatosensory cortex", Physical Therapy, 77(3), 269-284, 1996.
Tallal, P., Miller, S. L., Bedi, G., Byma, G., Wang, X., Nagarajan, S.S., Schreiner, C., Jenkins, W. M. and Merzenich, M. M., "Language comprehension in language-learning impaired children improved with acoustically modified speech", Science, 271: 81-83, 1996.
Nagarajan S.S. and Durand, D. “A Generalized Cable equation for Magnetic stimulation of neuronal structures”, IEEE Trans. in Biomedical Engineering, 43(3), 304-312, 1996.
Schreiner, C.E., Wong, S., Bonham, B., Ge, N., Nagarajan, S.S., "Spatio-temporal representation of complex sounds in auditory cortex", Proceedings of the ICONIP, Hong Kong, 1996.
Nagarajan, S.S. and Durand, D. “Analysis of magnetic stimulation of a concentric axon in a nerve bundle", IEEE Transactions in Biomedical Engineering, 42 (9), 926-933, 1995.
Nagarajan, S.S., Roth B.J., Durand, D. and Wijesinghe, R. “Magnetic stimulation of axons in a nerve bundle: Effects of current redistribution in the nerve bundle", Annals of Biomedical Engineering, 23 (2), 116-126, 1995.
Nagarajan, S.S. and Durand, D., “A general theory for predicting subthreshold transmembrane response to electric and magnetic fields”, Proc. International IEEE-EMBS Conference, Baltimore, 2:770-771,1994.
Nagarajan, S.S. and Durand, D., “A general theory for predicting subthreshold transmembrane response to electric and magnetic fields”, Proc. International IEEE-EMBS Conference, Baltimore, 2:770-771,1994.
Nagarajan, S.S., Durand, D., and Warman, E.N., “Effects of induced electric fields on finite neuronal structures: a simulation study,” IEEE Trans. in Biomedical Engineering, 40(11), 1175-1188, 1993.
Nagarajan, S.S. and Durand, D., “Analysis of magnetic stimulation of a single axon in a nerve bundle”, Proc. International IEEE-EMBS Conference, San Diego, 1993 (Chosen as a finalist in student paper competition).
Durand, D. and Nagarajan, S.S., “Theoretical and experimental aspects of magnetic nerve stimulation”, Proc. International IEEE-EMBS Conference, Paris, 1992.
Nagarajan, S.S., Durand, D., Ferguson, A.S., and Warman, E.N., “Magnetic stimulation of finite neuronal structures”, Proc. of International IEEE-EMBS Conference, Orlando, 13(2):847-8,1991 (Chosen as a finalist in student paper competition).

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