A single-channel (Cz; 10–20 International System) EEG montage was applied with a forehead ground and earlobe references1 (link). Bipolar EOG electrodes around the eyes and ECG electrodes on the chest were applied for later use in detecting corresponding artefacts in the MEG traces. Head shape and the location of head position indicator coils were digitized (Polhemus Isotrak, Polhemus Inc., VT, USA) for co-registration of MEG with anatomical T1-weighted MRI.
Isotrak
Manufactured by Polhemus
Sourced in United States
The ISOTRAK is a lab equipment product designed for precise tracking and monitoring of motion and position. It utilizes electromagnetic technology to capture real-time 3D data on the position and orientation of objects within a defined measurement volume.
Automatically generated - may contain errors
Lab products found in correlation
5 protocols using isotrak
1
EEG Montage for Multimodal Neuroimaging
2
Multimodal Neuroimaging Protocol with MEG and MRI
3
Magnetoencephalography Data Acquisition Protocol
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MEG data were obtained in a magnetically shielded room (Imedco AG, Hägendorf, Switzerland) using a a 306-channel whole-head MEG system (Elekta Neuromag) with a sampling rate of 1,000 Hz (online half-power band pass filter = 0.1–330 Hz). Bipolar leads were placed above and below the left eye (VEOG) and lateral to the outer canthi of both eyes (HEOG). Bipolar ECG leads were placed just below the left and right clavicle. Four head position indicator (HPI) coils were placed on the head and locations (relative to the nasion and preauricular points) were recorded using a 3D-digitizer (ISOTRAK; Polhemus, Inc., Colchester, VT). Head position was tracked continuously throughout the experiment.
4
Multimodal Neuroimaging Protocol for Brain Study
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MEG data were collected with a whole-head MEG system (CTF OMEGA System) consisting of 275 axial gradiometers. For each MEG session we first collected five minutes of empty room recordings, which we used to estimate noise covariance of the sensors (see below). Before the participant entering the magnetically shielded room, three marker coils were placed on the participant's head. Marker positions, nasion, left and right pre-auricular points, and the participant's head shape were recorded with a pen digitizer (Isotrak; Polhemus, Colchester, VT, USA), using a minimum of 500 points. Two electrooculogram electrodes were places above and below the left eye, to record eye blinks and eye movements during the MEG session. Two electrodes were placed across the plane of the chest to collect electrocardiographic signals, and a reference electrode was placed below the participant's collarbone. Each participant's MEG data and simultaneous electrooculographic and electrocardiographic signals were collected at a sampling frequency of 2400Hz. In conjunction with these data, we collected participants’ button responses using a Vpixx ResponsePixx button box system (VPixx Technologies, Saint-Bruno-de-Montarville, QC, Canada).
5
Simultaneous EEG and MEG Recordings
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