3d tracking device

Manufactured by Polhemus

The 3D tracking device is a precision instrument that measures the position and orientation of a target object in a three-dimensional space. It provides real-time data on the object's location and rotation, enabling accurate tracking and monitoring applications.

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Lab products found in correlation

Magnetom skyra mr scanner, by Siemens (2 mentions) Eyelink eye tracker, by SR Research (1 mentions)

4 protocols using 3d tracking device

MEG Data Acquisition and Coregistration Protocol

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MEG data were recorded at a sampling rate of 1,200 Hz using a 275-channel axial gradiometer system (CTF MEG systems, VSM MedTech) located in a magnetically shielded room. Eight sensors were disabled due to permanent malfunction, leaving a total of 267 usable sensors. Three fiducial localization coils were placed at the participant's nasion and left and right ear canals to (1) allow for real-time monitoring (Stolk et al., 2013 (link)) of the participant's head position and adjustment in between experimental blocks if necessary and (2) provide anatomical landmarks for offline coregistration of the MEG data with T1-weighted MRI images for source reconstruction. After completion of the task, the coordinates of the three fiducial points as well as the participant's head shape were digitized using a Polhemus 3D tracking device (Polhemus). Individual structural MRI scans were acquired in a 3 T Siemens Magnetom Skyra MR scanner using earplugs with a drop of vitamin E at the participant's ear canals to facilitate subsequent alignment with the MEG data.

Zioga I., Zhou Y.J., Weissbart H., Martin A.E, & Haegens S. (2024). Alpha and Beta Oscillations Differentially Support Word Production in a Rule-Switching Task. eNeuro, 11(4), ENEURO.0312-23.2024.

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Multimodal Infant Brain Mapping

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MEG data were collected using the Elekta Neuromag 306 channel biomagnetometer and sampled at 1000 Hz with online 0.1-300 Hz anti-aliasing filters. Bipolar EEG channels were attached to each clavicle to assess electrocardiogram (ECG). Electromyogram (EMG) bipolar leads were attached to the left and right infant forearms to capture squeezing (one on the elbow and one on the forearm muscle). EMG channels captured additional squeezing, as infants may squeeze without the pipette. Finally, forearm EMG placed on the investigator's arm tracked investigator squeezes. A Polhemus 3D tracking device was used to identify infant fiducial points (nasion, left and right preauricular points), MEG HPI coil locations, and EEG sensor array positioning in addition to extra points to outline infant head shape.
Infants were measured in supine position with the left hemisphere positioned close to the sensors to optimize signal strength from left hemisphere [26 (link)]. Investigator and parent were seated on either side of the bed. Video-recording and physiological monitoring channels (infant EMG and investigator EMG) characterized behavior during MEG data collection.

Sanjuan P.M., Poremba C., Flynn L.R., Savich R., Annett R.D, & Stephen J. (2016). Association between theta power in 6-month old infants at rest and maternal PTSD severity: A pilot study. Neuroscience letters, 630, 120-126.

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Whole-Head MEG Data Acquisition Protocol

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Whole-head MEG data were acquired at a sampling frequency of 1200 Hz with a 275-channel MEG system with axial gradiometers (CTF MEG Systems, VSM MedTech Ltd.) in a dimly lit magnetically shielded room. Six permanently faulty channels were disabled during the recordings, leaving 269 recorded MEG channels. Three fiducial coils were placed at the participant’s nasion and both ear canals, to provide online monitoring of participant’s head position (Stolk et al., 2013 (link)) and offline anatomic landmarks for co-registration. Eye position was recorded using an eye tracker (EyeLink, SR Research Ltd.). Upon completion of the MEG session, participant’s head shape and the location of the three fiducial coils were digitized using a Polhemus 3D tracking device (Polhemus). Anatomical T1-weighted MRIs were obtained during a separate session. To improve co-registration of the MRIs and MEG data, earplugs with a drop of vitamin E were placed at participant’s ear canals during MRI acquisition. These anatomic scans were used for source reconstruction of the MEG signal.

ElShafei H.A., Orlemann C, & Haegens S. (2022). The Impact of Eye Closure on Anticipatory α Activity in a Tactile Discrimination Task. eNeuro, 9(1), ENEURO.0412-21.2021.

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Multimodal Neuroimaging of Cognitive Processes

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MEG data were recorded with a 275-channel CTF MEG system with axial gradiometers at a sampling rate of 1200 Hz (CTF MEG systems, VSM MedTech Ltd.). Six channels were disabled because of permanent malfunction. In order to monitor the head position of the participants and to allow for adjustments to the original position in between blocks, the real-time representation of the participant’s head position was monitored using three head localization coils at the right and left ear canals as well as the nasion (Stolk et al., 2013 (link)). These points were further used as offline anatomic landmarks to align the MEG data with structural images of the participant’s brain for source reconstruction. Further, movement of the left eye was tracked during the experiment using an Eyelink eyetracker (SR Research Ltd.). After the experiment, the participant’s head shape was digitized using a Polhemus 3D tracking device (Polhemus). In a separate session, an anatomic MRI scan of the participant’s brain was recorded, unless the participant’s scan could be obtained from the database of the institute. The MRI data were recorded with the 3T Siemens Magnetom Skyra MR scanner.

Rodriguez-Larios J., ElShafei A., Wiehe M, & Haegens S. (2022). Visual Working Memory Recruits Two Functionally Distinct Alpha Rhythms in Posterior Cortex. eNeuro, 9(5), ENEURO.0159-22.2022.

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