EEG was recorded in an acoustically shielded room with a BrainAmp amplifier system (Brain Products, Gilching, Germany) at a sampling rate of 1000 Hz. A 32-electrode cap was used, and electrodes were placed in accordance with the international 10/20 system. All electrode impedances were ensured to be <25 kΩ. To record the electrooculogram, electrodes 28 and 32 were placed beside and above the left eye. For online recording, the FCz was used as a reference electrode. The audio stimuli were presented at a 44.1 kHz sample rate during the EEG recording using the Presentation software (Neurobehavioral System, Berkeley, CA). All participants were instructed to ignore the audio stimuli and watch a subtitled movie with muted audio (more details available in Petersen et al., 2020 (link)). The duration of the EEG recording was approximately 35 min.
Brainamp amplifier system
Manufactured by Brain Products
Sourced in Germany
The BrainAmp amplifier system is a laboratory-grade device designed for the acquisition and amplification of bioelectrical signals, such as electroencephalography (EEG) and related physiological measurements. The system offers high-precision, low-noise amplification of signals, providing researchers and clinicians with a reliable tool for their data collection needs.
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7 protocols using brainamp amplifier system
1
EEG Recording of Passive Auditory Stimuli
2
EEG Data Collection and Analysis for Color-Matching Task
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EEG data were collected in the one-back color-matching task only. The EEG signal was recorded from 30 Ag/AgCl electrodes secured in an elastic cap according to the extended 10–20 system. The EEG data were recorded with a BrainAmp amplifier system and the software for EEG recording was Brain Vision Recorder (Brain Products GmbH, Germany). The Cz electrode served as an online reference, but the data were offline re-referenced to the average. Horizontal EOG was recorded in a bipolar lead from two additional electrodes placed on the outer canthi of the two eyes. Vertical EOG was recorded in a bipolar lead from additional electrodes placed on the supra-orbital and infra-orbital ridges of the right eye. The electrode impedance was kept below 5 kΩ. The EEG and EOG signal were continuously recorded and amplified at a sampling rate of 1000 Hz, with a band pass from AC 0.1 to 100 Hz.
In the offline analysis, the EEG signal was first low-pass filtered at 30 Hz and automatically scanned for artifacts in EEGLab (Delorme and Makeig, 2004 (link)), an open-source EEG data analysis toolbox implemented in MATLAB. Using the default parameters of the SASICA toolbox (Chaumon et al., 2015 (link)), eye movement artifacts in the EEG signal were removed with an ICA-based procedure (Delorme et al., 2012 (link)).
In the offline analysis, the EEG signal was first low-pass filtered at 30 Hz and automatically scanned for artifacts in EEGLab (Delorme and Makeig, 2004 (link)), an open-source EEG data analysis toolbox implemented in MATLAB. Using the default parameters of the SASICA toolbox (Chaumon et al., 2015 (link)), eye movement artifacts in the EEG signal were removed with an ICA-based procedure (Delorme et al., 2012 (link)).
3
Electrophysiological Recording of Auditory Responses
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SEEG signals were recorded at a sampling rate of 1,000 Hz using a 256-channel BrainAmp amplifier system (Brain Products GmbH, Munich, Germany) and bandpass filtered between 0.3 and 500 Hz. A scalp electrode placed in Fz was used as the recording reference. SEEG data were epoched between −5 s to 5 s relative to stimulus onset (either pure tones or syllables). Such a long temporal window for epoching allowed a more precise frequency resolution for time-frequency analysis. Epochs with artifacts and epileptic spikes were discarded by visual inspection. Data were referenced into a bipolar montage by subtracting activity recorded at each contact of interest from activity acquired at its closest neighbor site within the same electrode.
4
Scalp EEG Recording Parameters
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EEG data were continuously recorded using a BrainAmp amplifier system (BrainProducts, Gilching, Germany) with passive Ag/AgCl electrodes from 96 scalp positions using an infracerebral electrode cap with an equidistant electrode layout (Easycap, Herrsching, Germany). The horizontal electrooculogram (EOG) was measured with electrodes placed at the outer canthi of the left and right eye. The vertical EOG was obtained from separate electrodes placed below the left and right eye and from two electrodes above the eyes that were inserted in the electrode cap. The reference electrode was placed at the tip of the nose. EEG and EOG signals were amplified and recorded with a sampling rate of 500 Hz, applying an analog filter with 250 Hz low pass and 0.0159 Hz high pass (time constant 10 s).
5
Multimodal Neurophysiological Acquisition Protocol
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EEG data were acquired from 65 sintered Ag/AgCl electrodes using an equidistant infracerebral electrode layout with a central frontopolar site as ground and a nose tip reference (Easycap, Herrsching, Germany). In addition, bipolar surface EMG was recorded from both hands and arms by placing sintered Ag/AgCl electrodes over the muscle belly and the proximal base of the Flexor digitorum superficialis and the Abductor pollicis longus with reference and ground on the collarbone. Both EEG and EMG data were recorded using a BrainAmp amplifier system (Brain-Products, Gilching, Germany). Data were obtained with an amplitude resolution of 0.1 μV and a sampling rate of 500 Hz with online analogue filter settings of 0.016 to 250 Hz. Electrode impedances were maintained below 10 kΩ for the EEG and below 100 kΩ for the EMG before data acquisition. Data acquisition was performed using the OpenViBE acquisition server 0.17.1 [29] . In addition, resting state EEG recordings of two minutes each were obtained before and after each session using BrainVision recorder software (Version 1.20.0506, Brain-Products GmbH, Gilching, Germany).
6
Intracerebral EEG Signal Acquisition
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Intracerebral EEG signals were recorded continuously at a sampling rate of 1000 Hz using a 256-channel BrainAmp amplifier system (Brain Products GmbH, Munich, Germany). An acquisition band-pass filter was used to limit the bandwidth of the output signal to between 0.16 and 200 Hz. A scalp electrode placed in Fz was used as the recording reference. Off-line preprocessing was performed with BrainVision Analyzer software (Brain Products GmbH, Munich, Germany).
7
Intracerebral EEG Signal Acquisition and Analysis
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Intracerebral EEG signals were recorded at a sampling rate of 1000 Hz using a 256-channel BrainAmp amplifier system (Brain Products GmbH, Munich, Germany). An acquisition band-pass filter was used to limit the bandwidth of the output signal to between 0.16 and 200 Hz. A scalp electrode placed in Fz was used as the recording reference.
Off-line preprocessing was performed with BrainVision Analyzer software (Brain Products GmbH, Munich, Germany). Data were then imported into MATLAB 2012a (The MathWorks, Natick, MA) for signal processing and statistical analysis. Cortex representations were created in Brainstorm (Tadel, Baillet, Mosher, Pantazis, & Leahy, 2011) (link), which is freely available for download under the GNU general public license (http://neuroimage.usc.edu/brainstorm).
Off-line preprocessing was performed with BrainVision Analyzer software (Brain Products GmbH, Munich, Germany). Data were then imported into MATLAB 2012a (The MathWorks, Natick, MA) for signal processing and statistical analysis. Cortex representations were created in Brainstorm (Tadel, Baillet, Mosher, Pantazis, & Leahy, 2011) (link), which is freely available for download under the GNU general public license (http://neuroimage.usc.edu/brainstorm).
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