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Updated: Jul 16, 2026
Recording Human Electrocorticographic (ECoG) Signals for Neuroscientific Research and Real-time Functional Cortical Mapping
Published on: June 26, 2012
Recording of focal direct current (DC) changes in the human cerebral cortex using refined non-invasive DC-EEG
Stefanie Leistner1, Hans-Juergen Scheer, Tilmann Sander
1Neurophysics Group, Department of Neurology, Campus Benjamin Franklin, Charité- University Medicine Berlin, Berlin, Germany. stefanie.leistner@charite.de
Abstract:
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.
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