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Stefanie Leistner, Hans-Juergen Scheer, Tilmann Sander, Martin Burghoff, Lutz Trahms, Gabriel Curio, Bruno-Marcel Mackert

Recording of focal direct current (DC) changes in the human cerebral cortex using refined non-invasive DC-EEG methodology

Keywords: DC electroencephalography, direct current, motor cortex

A non-invasive DC electroencephalographic (DC-EEG) method was developed to record and analyze focal low-frequency (<0.1 Hz) DC changes in the human cerebral cortex. A simple repetitive finger-movement task was used as a physiological activation paradigm. DC-EEG amplitudes were recorded using a custom-made DC amplifier with automatic offset correction. A total of 16 standard Ag/AgCl electrodes covered the left primary motor cortex. In three of six subjects, reliable focal motor-related DC-EEG shifts over the hand cortex were monitored. This study demonstrates that refined DC-EEG recording and data analysis procedures allow non-invasive recording of low-frequency and low-amplitude focal cortical changes in humans. An important clinical perspective of this technology is the detection of stroke-associated cortical DC activity.

Biomedizinische Technik, Walter de Gruyter

Print ISSN: 0013-5585
Volume: 52, 02/2007
Pages: 102 - 105

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