|
Interests:
-
Magnetic Resonance Imaging (MRI)
-
Diffusion Tensor Imaging (DTI)
-
Structural MRI
-
Functional MRI
-
Transcranial Magnetic Stimulation (TMS)
-
Quality Assurance in MRI (QUAMRI-Website)
Publications:
- Meinzer M, Breitenstein C, Westerhoff U, Sommer J, Rösser N, Rodriguez AD, Harnish S, Knecht S, Flöel A.
Motor Cortex Preactivation by Standing Facilitates Word Retrieval in Aphasia.
Neurorehabil Neural Repair. 2010 Oct 21. Epub 2010.
PMID: 20966157
- Ruscheweyh R, Willemer C, Krüger K, Duning T, Warnecke T, Sommer J, Völker K, Ho HV, Mooren F, Knecht S, Flöel A.
Physical activity and memory functions: An interventional study.
Neurobiol Aging. 2009 Aug 27.
PMID: 19716631
- Jansen A, Sehlmeyer C, Pfleiderer B, Sommer J, Konrad C, Zwitserlood P, Knecht S.
Assessment of verbal memory by fMRI: lateralization and functional neuroanatomy.
Clin Neurol Neurosurg. 2009 Jan;111(1):57-62. Epub 2008 Oct 14.
PMID: 18922628
- Jansen A, Menke R, Sommer J, Forster AF, Bruchmann S, Hempleman J, Weber B, Knecht S.
The assessment of hemispheric lateralization in functional MRI-Robustness and reproducibility.
Neuroimage 2006; Epub 2006 Aug 10.
PMID: 16904913
- Konrad C, Jansen A, Henningsen H, Sommer J, Turski PA, Brooks BR, Knecht S.
Subcortical reorganization in amyotrophic lateral sclerosis.
Exp Brain Res. 2006 Jul;172(3):361-9. Epub 2006 Mar 25.
PMID: 16463149
- Sommer J, Jansen A, Drager B, Steinstrater O, Breitenstein C, Deppe M, Knecht S.
Transcranial magnetic stimulation--a sandwich coil design for a better sham.
Clin Neurophysiol. 2006 Feb;117(2):440-6. Epub 2005 Dec 22.
PMID: 16376141
- Burgmer M, Konrad C, Jansen A, Kugel H, Sommer J, Heindel W, Ringelstein EB, Heuft G, Knecht S.
Abnormal brain activation during movement observation in patients with conversion paralysis.
Neuroimage. 2006 Feb 15;29(4):1336-43. Epub 2005 Oct 5.
PMID: 16213162
- Floel A, Jansen A, Deppe M, Kanowski M, Konrad C, Sommer J, Knecht S.
Atypical hemispheric dominance for attention: functional MRI topography.
J Cereb Blood Flow Metab. 2005 Sep;25(9):1197-208.
PMID: 15815582
- Knecht S, Sommer J, Deppe M, Steinstrater O.
Scalp position and efficacy of transcranial magnetic stimulation.
Clin Neurophysiol. 2005 Aug;116(8):1988-93.
PMID: 15979404
- Breitenstein C, Jansen A, Deppe M, Foerster AF, Sommer J, Wolbers T, Knecht S.
Hippocampus activity differentiates good from poor learners of a novel lexicon.
Neuroimage. 2005 Apr 15;25(3):958-68.
PMID: 15808996
- Knecht S, Jansen A, Frank A, van Randenborgh J, Sommer J, Kanowski M, Heinze HJ.
How atypical is atypical language dominance?
Neuroimage. 2003 Apr;18(4):917-27.
PMID: 12725767
- Knecht S, Floel A, Drager B, Breitenstein C, Sommer J, Henningsen H, Ringelstein EB, Pascual-Leone A.
Degree of language lateralization determines susceptibility to unilateral brain lesions.
Nat Neurosci. 2002 Jul;5(7):695-9.
PMID: 12055632
- Floel A, Knecht S, Lohmann H, Deppe M, Sommer J, Drager B, Ringelstein EB, Henningsen H.
Language and spatial attention can lateralize to the same hemisphere in healthy humans.
Neurology. 2001 Sep 25;57(6):1018-24.
PMID: 11571327
Abstracts:
- HBM 2003: Interindividual Variability in the Cortex-to-Scalp Distance
- HBM 2004: A "Cheap to Build" and "Easy to Use" Response Box for fMRI-Experiments
- HBM 2005: Sham TMS - A New Approach
- Neurovisionen 2006: Therapeutische Perspektiven der Transkraniellen Magnetischen Stimulation: Problem Stimulationsintensität
- HBM 2007: Variability of stimulation intensity as one reason for inconsistent TMS results in group studies.
- HBM 2009: Onsite simple vocal reactiontime measurement.
Software:
MouseButtons.zip - a simple tool to test the response box from the HBM 2004-abstract.
Extract the files and start MouseButtons.exe
GUI_for_ExportKP.exe - Graphical User Interface for the ExportKP-Tool for KeyPoint EMG-Software (KeyPoint is for example available from AlpineBiomed).
TrigGen.exe
- TriggerGenerator. Useful to generate trigger signals on the default
parallel port of your computer. You can use it to simulate a trigger
signal (e.g. from an MRT) for testing of triggered paradigms if you do
not want to rely on 'virtual triggers' (e.g. simulated triggers in
Presentation, Neurobehavioural Systems.
This program requires the Port I/O driver from Scientific Software Tools.
AnalyseWave.exe -
This program allows you to automatically find triggers on one channel and to manually determine the onset of a voice on the second channel of a wave-file.
The wave file should be 8 or 16 bit, stereo. Compressed files are not supported. Start the program and select file->load.
If the program can open the selected file type it will show two data tracks. Per channel one. The upper channel is the trigger channel.
The lower channel is the voice channel. In a further version of the program it will be possible to switch the two channels for the analysis...
for now, you must reverse the channels with an audio editor :-( Press the 'forward'-button to find the first trigger.
Select the 'play'-button and the program will start replaying the wave file, starting 1500ms after the trigger onset.
You can increase this time (deltaT) by pressing '+' or '-'. Every click will increase or decrease deltaT by the time step selected.
If you are happy with the onset of the replayed sequence add the timings to the table with the '>>'-button.
In the table you are free to change any entry - especially in the comments field you can enter the answer you have heard.
Please feel free to send me comments on the program - at least errors will be corrected as soon as possible.
IIAP.exe - is a program for feedback measurements. It triggers a stimulator via parallel port and acquires data from a measurement computing analog digital converter.
The results are displayed for the subject as feedback.
Screenshots will be displayed soon.
|
