EEG data were recorded continuously using a 129-channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, Oregon, USA) with a sponge-based HydroCel Sensor Net. The net was aligned with reference to three anatomical head landmarks: two preauricular points and the nasion landmark. Electrode-to-skin impedances were kept below 50 kΩ and were kept at equal levels across all electrodes. A recording band-pass filter was set at 0.001–200 Hz with a sampling rate of 1000 Hz. The Cz electrode was used as a reference electrode.
Geodesics egi system
Manufactured by Electrical Geodesics
Sourced in United States
The Geodesics EGI System is a high-density electroencephalography (EEG) system designed for research and clinical applications. It utilizes a sensor net with a large number of electrodes to record brain electrical activity with high spatial resolution. The system provides a comprehensive platform for data acquisition, visualization, and analysis, enabling researchers and clinicians to study brain function and dysfunction.
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8 protocols using geodesics egi system
1
High-Density EEG Recording Protocol
2
EEG Recording Using 129-Channel Geodesic System
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EEG was recorded continuously using a 129‐channel Geodesics EGI System (Electrical Geodesics, Inc.) with a sponge‐based HydroCel Sensor Net. The sensor net was aligned with respect to three anatomical landmarks: two preauricular points and the nasion. Electrode‐to‐skin impedances were kept below 50 kΩ and at equal levels across all electrodes, as recommended for the system (Ferree et al., 2001 (link); Luu et al., 2001 (link); Luu et al., 2003 (link); Picton et al., 2000 (link)). The recording band‐pass filter was 0.001–200 Hz with a sampling rate of 1000 Hz. The electrode 129 (corresponding to Cz in the 10–10 system) served as the reference.
3
Multi-modal Neurophysiological Recording Protocol
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EEG was recorded continuously using a 129-channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, OR, USA) with the sponge-based Geodesic Sensor Net. The sensor net was aligned with respect to three anatomical landmarks; two pre-auricular points and the naison. Electrode-to-skin impedances were kept below 50 kΩ and at equal levels across all electrodes. The recording band-pass filter was 0.01−1000 Hz, and the sampling rate was 1000 Hz. The electrode Cz was used as the reference.
Participants’ respiration and pulse rate was recorded continuously throughout the experiment with a piezoelectric respiratory belt transducer worn around the chest at the level of the epigastrium, and a finger pulse oximeter transducer worn on the index finger of the left hand (ADInstruments Ltd., Oxford, UK). Signals were transduced and extracted using LabChart 7 (ADInstruments Ltd., Oxford, UK).
Participants’ respiration and pulse rate was recorded continuously throughout the experiment with a piezoelectric respiratory belt transducer worn around the chest at the level of the epigastrium, and a finger pulse oximeter transducer worn on the index finger of the left hand (ADInstruments Ltd., Oxford, UK). Signals were transduced and extracted using LabChart 7 (ADInstruments Ltd., Oxford, UK).
4
Comprehensive EEG Acquisition Protocol
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EEG was recorded continuously using a 129‐channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, Oregon, USA) with a sponge‐based HydroCel Sensor Net. This system allows full head electrode coverage as it includes electrodes positioned over lower scalp regions and face, which is essential for identification of deep cortical sources, such as those located in orbitofrontal cortex (Luu et al., 2001 (link), 2009 ; Sperli et al., 2006 (link); Tucker, 1993 (link)). The sensor net was aligned with respect to three anatomical landmarks: two preauricular points and the nasion. Electrode‐to‐skin impedances were kept below 50 kΩ and at equal levels across all electrodes, as recommended for the system (Ferree et al., 2001 (link); Luu et al., 2003 (link); Picton et al., 2000 (link)). The recording band‐pass filter was 0.001–200 Hz with sampling rate of 1000 Hz. The electrode Cz served as the reference electrode.
5
High-Density EEG Recording for ERP Analysis
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EEG data was recorded continuously using a 128-channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, Oregon, USA) with a sponge-based Geodesic Sensor Net. The sensor net was aligned with respect to three anatomical landmarks including two pre-auricular points and the nasion. The electrode-to-skin impedances were kept below 50 kΩ and at equal levels across electrodes. The recording bandpass filter was 0.1−100 Hz and the sampling rate was 250 Hz. These recording parameters were suitable for quantification of the mid-long latency ERP components which were of specific interest for the present study.
6
High-Density EEG Acquisition Protocol
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EEG was recorded continuously using the 129-channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, Oregon, USA) with the sponge-based Geodesic Sensor Net. The sensor net was aligned with respect to three anatomical landmarks including two pre-auricular points and the nasion. The electrode-to-skin impedances were kept below 50 kΩ and at equal levels in all electrodes. The recording band-pass filter was 0.1–200 Hz, and the sampling rate was 1000 Hz. The electrode Cz was used as the reference electrode.
7
Continuous EEG Acquisition Protocol
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Continuous EEG was recorded using a 129-channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, OR) with a sponge-based HydroCel Sensor Net. The sensor net was aligned with respect to three anatomical landmarks of two preauricular points and the nasion. Electrode-to-skin impedances were kept below 50 kΩ throughout the experiment. A recording bandpass filter was set at 0.001–200 Hz with a sampling rate of 1,000 Hz. Electrode Cz was used as a reference electrode during the recordings.
8
Multimodal Recording of EEG, Respiration, and Pulse
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EEG was recorded continuously using a 128-channel Geodesics EGI System (Electrical Geodesics, Inc., Eugene, Oregon, USA) with a sponge-based Geodesic Sensor Net. The sensor net was aligned with respect to three anatomical landmarks; two pre-auricular points and the nasion.
Electrode-to-skin impedances were kept below 50 kΩ and at equal levels across all electrodes. The recording band-pass filter was 0.01-1000 Hz, and the sampling rate was 1000 Hz. Electrode Cz was used as the reference.
Participants' respiration and pulse rate were recorded continuously throughout the experiment with a piezo-electric respiratory belt transducer worn around the chest at the level of the epigastrium, and a finger pulse oximeter transducer worn on the index finger of the left hand (ADInstruments Ltd., Oxford, UK). Signals were transduced and extracted using LabChart 7 (ADInstruments Ltd., Oxford, UK).
Electrode-to-skin impedances were kept below 50 kΩ and at equal levels across all electrodes. The recording band-pass filter was 0.01-1000 Hz, and the sampling rate was 1000 Hz. Electrode Cz was used as the reference.
Participants' respiration and pulse rate were recorded continuously throughout the experiment with a piezo-electric respiratory belt transducer worn around the chest at the level of the epigastrium, and a finger pulse oximeter transducer worn on the index finger of the left hand (ADInstruments Ltd., Oxford, UK). Signals were transduced and extracted using LabChart 7 (ADInstruments Ltd., Oxford, UK).
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