A 32-channel Brain Products EEG cap (Brain Products GmbH, Gilching, Germany) was used to record scalp activity (see channel names and configuration in Supplementary Figure 3 ). Electrolyte gel (SuperVisc, EASYCAP GmbH, Herrsching, Germany) was inserted through indentations in the electrodes and onto the scalp to increase conductivity. The impedance of each electrode was kept below 5 kΩ. The stimuli were delivered using Presentation software (Neurobehavioral Systems, Inc.) through a pair of Sony Stereo headphones (model MDR-XD100, Sony Europe Ltd.) placed comfortably on the participants' heads over the EEG cap. EEG activity was recorded at 1 KHz sampling rate using actiCap equipment and BrainVision Recorder software (Brain Products GmbH, Gilching, Germany).
Supervisc
Manufactured by EASYCAP
Sourced in Germany
SuperVisc is a high-performance laboratory viscometer designed for accurate measurement of fluid viscosity. The device utilizes a rotating spindle immersed in the sample to determine the fluid's resistance to flow, providing reliable viscosity data.
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Lab products found in correlation
5 protocols using supervisc
1
Scalp EEG Recording Using 32-Channel Brain Products Cap
2
EEG Recording for Cognitive Task Performance
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The EEG was recorded with a 32-channel EEG device using active electrodes (actiCHamp, Brain Products, Gilching, Germany) at a sampling rate of 500 Hz. Electrodes were placed in a nonconductive EEG cap (actiCAP, EASYCAP GmbH, Woerthsee-Etterschlag, Germany) and positioned at Fp1, Fp2, F7, F3, Fz, F4, F8, FC5, FC3, FC1, FC2, FC4, FC6, T7, C3, Cz, C4, T8, CP5, CP3, CP1, CP2, CP4, CP6, P7, P3, Pz, P4, P8, O1, Oz, and O2 according to the international 10–10 EEG system. FPz served as ground, and Fz was used as the reference electrode. Active electrodes (Ag/AgCl) were filled with highly conductive electrolyte gel (SuperVisc, EASYCAP GmbH, Woerthsee-Etterschlag, Germany) to reach low impedance levels (<5 kΩ). EEG recordings were conducted during rest, as well as during FM task performance. Participants were instructed to sit comfortably but calmly on the chair for rest measurements (60 s with opened eyes), with relaxed facial muscles, both hands lying on the table, and looking at a white fixation cross presented on a black screen.
3
EEG Recording with 64-Channel actiCap
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The signal was recorded from 64 active Ag/AgCl electrodes placed in a standard 10-10 arrangement (Oosterveld and Praamstra, 2001 (link)) on an actiCap (BrainProducts, Gilching, Germany). The signal was recorded using a 1-kHz BrainAmp DC amplifier (BrainProducts, Gilching, Germany) and saved to a Windows 7 PC with the Brain Vision Recorder software (version 1.20). During the recording, FCz served as the online reference, and for display purposes, the signal was online filtered at 250 Hz. To stabilize the skin–electrode conductivity, a high-viscosity electrolyte gel was used (SuperVisc, EASYCAP GmbH, Herrsching, Germany).
4
Multi-Modal EEG Acquisition for Cognitive Tasks
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EEG was recorded continuously during cognitive task performance from 30 scalp electrodes positioned according to the international 10–20 system using the NeurOne Tesla EEG amplifier (Bittium, NeurOne, Bittium Corporation, Finland) with a sampling rate of 1000 Hz. The electrodes included: Fp1, Fp2, Fz, F3, F4, F7, F8, Fc1, Fc2, Fc5, Fc6, Cz, C3, C4, T7, T8, Tp9, Tp10, Cp1, Cp2, Cp5, Cp6, Pz, P3, P4, P7, P8, Iz, O1, and O2, and were mounted on the head with a cap (EASYCAP GmbH, Herrsching, Germany). The reference electrode was positioned on FCz, and the ground electrode was placed at the AFz position. The electrodes were connected to the head using high-viscosity electrolyte gel (SuperVisc, Easycap, Herrsching, Germany). All impedances were kept below 10 kΩ throughout the experimental sessions. EEG data were collected in a shielded room and no observed spectral peaks at 50 Hz. Raw EEG data were recorded and stored for offline analysis using BrainVision Analyzer 2.1 (Brain Products GmbH, München, Germany). EEG recording included resting-state measurement, and consisted of eyes open and closed states alternating every 60 s for 4 min, and task-based measurement.
5
EEG Recording and Analysis of Visual Evoked Potentials
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During presentation of pattern reversals, the EEG was recorded using a 32 active channel system (actiCHamp, Brain Products, Herrsching, Germany) with DC recording sampled at 500 Hz and impedances below 10 kΩ (kilo ohms) per electrode during all experiment sessions. The electrodes were connected to an air-permeable cap with adjustable size to the participant's head (Easy-cap, Herrsching, Germany) using a spatial distribution following the international 10/10 system (JURCAK; TSUZUKI; DAN, 2007) We applied saline gel (SuperVisc, EasyCap GmbH, Herrsching, Germany) to facilitate signal transduction and promote the correct electrode contact. After the recording section, data were re-referenced by common-average, band-passed using a Butterworth lter of order 2 between 0.6 and 100 Hz. The artifacts were removed through a semiautomatic Independent Component Analysis using ICLabel (PION-TONACHINI; KREUTZ-DELGADO; MAKEIG, 2019). After the preprocessing step, the data was visually inspected and imported to MATLAB to perform the analysis of the visual evoked potential and graphbased connectivity.
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