Research Topics
| Thomas WitzelSummaryAffiliation: Harvard University Country: USA Publications
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Detail Information
Publications
Differences in cortical response to acupressure and electroacupuncture stimuliThomas Witzel
Harvard Medical School, Martinos Center for Biomedical Imaging, Charlestown, MA 02129, USA
BMC Neurosci 12:73. 2011..We used whole head magnetoencephalography (MEG) to map S1 brain response during 15 minutes of electroacupuncture (EA) and acupressure (AP). We further assessed how brain response changed during the course of stimulation...- Stimulus-induced Rotary Saturation (SIRS): a potential method for the detection of neuronal currents with MRIThomas Witzel
Speech and Hearing Bioscience and Technology Program, Harvard MIT Division of Health Sciences and Technology, USA
Neuroimage 42:1357-65. 2008..Magn. Reson. Med. 50, 40-49], but is potentially less encumbered by temporal and spatial cancellation effects... - Onset timing of cross-sensory activations and multisensory interactions in auditory and visual sensory corticesTommi Raij
MGH MIT HMS Athinoula A Martinos Center for Biomedical Imaging, Bldg 149, 13 St, Charlestown, MA, USA
Eur J Neurosci 31:1772-82. 2010..Audiovisual interactions started at 85 ms in the left auditory, 80 ms in the right auditory and 74 ms in the visual cortex, i.e., 3-21 ms after inputs from the two modalities converged... - Cancellation of EEG and MEG signals generated by extended and distributed sourcesSeppo P Ahlfors
Athinoula A Martinos Center for Biomedical Imaging, Massachusetts General Hospital Harvard Medical School, Charlestown, 02129, USA
Hum Brain Mapp 31:140-9. 2010..Furthermore, the selective cancellation may be used to explain some observed differences between EEG and MEG in terms of focal vs. widespread cortical activity... - Spatiotemporal mapping the neural correlates of acupuncture with MEGRupali P Dhond
MGH MIT HMS Martinos Center for Biomedical Imaging, Charlestown, Massachusetts 02129, USA
J Altern Complement Med 14:679-88. 2008..Thus, MEG provides excellent spatiotemporal characterization of the somatosensory component of acupuncture, and future studies can contrast derived brain response parameters in healthy controls with those found in a diseased state... - Linear constraint minimum variance beamformer functional magnetic resonance inverse imagingFa Hsuan Lin
Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan
Neuroimage 43:297-311. 2008..Robust results from both single subject and group analyses demonstrate the excellent sensitivity and specificity of volumetric InI in detecting the spatial and temporal structure of task-related brain activity... - Event-related single-shot volumetric functional magnetic resonance inverse imaging of visual processingFa Hsuan Lin
MGH HST Athinoula A Martinos Center for Biomedical Imaging, Charlestown, MA 02129, USA
Neuroimage 42:230-47. 2008..Robust results from both single subject and group analyses demonstrate the sensitivity and feasibility of using volumetric InI in high temporal resolution investigations of human brain function... - Task-modulated "what" and "where" pathways in human auditory cortexJyrki Ahveninen
Harvard Medical School Athinoula A Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, CNY 149 13th Street, Charlestown, MA 02129, USA
Proc Natl Acad Sci U S A 103:14608-13. 2006..This finding suggests that selective-attention effects are feature-specific in the human nonprimary auditory cortex and that they arise from enhanced tuning of receptive fields of task-relevant neuronal populations... - Spatiotemporal cortical dynamics underlying abstract and concrete word readingRupali P Dhond
MGH MIT HMS Athinoula A Martinos Center for Biomedical Imaging, Charlestown, MA 02129, USA
Hum Brain Mapp 28:355-62. 2007.... 
Assessing and improving the spatial accuracy in MEG source localization by depth-weighted minimum-norm estimatesFa Hsuan Lin
MGH MIT HMS Athinoula A Martinos Center for Biomedical Imaging, Building 149 13th St Charlestown, MA 02129, USA
Neuroimage 31:160-71. 2006..The application of depth weighting to auditory and somatosensory experimental data illustrated the beneficial effect of depth weighting on the accuracy of spatiotemporal mapping of neuronal sources...- Spatiotemporal brain maps of delayed word repetition and recognitionRupali P Dhond
MGH MIT HMS Athinoula A Martinos Center for Biomedical Imaging, Room 2301, Building 149, 13th Street, Charlestown, MA 02129, USA
Neuroimage 28:293-304. 2005..Additionally, left ventromedial temporal sites may be relatively more involved in episodic retrieval, while lateral temporal sites may participate more in automatic priming... - Spatiotemporal maps of past-tense verb inflectionRupali P Dhond
Department of Radiology, University of Utah, Salt Lake City 84105, USA
Neuroimage 19:91-100. 2003..Thus, the brain inflects verbs by dynamically modulating different functional divisions of an integrated language system... - GABA-ergic modulation of prefrontal spatio-temporal activation pattern during emotional processing: a combined fMRI/MEG study with placebo and lorazepamGeorg Northoff
Department of Neurology, Section of Behavioral Neurology, Beth Israel Deaconess Medical Center, Harvard University, Kirstein Building KS 454, 330 Brookline Avenue, Boston, 02215 MA, USA
J Cogn Neurosci 14:348-70. 2002..Such a modulation of orbito-frontal cortical emotional function by lorazepam has to be distinguished from its effects on cortical motor function as being independent from the kind of processing either emotional or nonemotional...