Functional MEG data were collected using an Elekta/MEGIN MEG system (Helsinki, Finland) equipped with 306 sensors (204 planar gradiometers and 102 magnetometers) using a 1 kHz sampling rate and an acquisition bandwidth of 0.1–330 Hz in a one-layer magnetically shielded room with active shielding engaged. Prior to MEG acquisition, four coils were attached to the participant’s head and localized along with fiducial and scalp surface points using a three-dimensional (3D) digitizer (FASTRAK 3SF0002, Polhemus Navigator Sciences, Colchester, VT, USA). Once the participants were positioned for MEG recording, an electric current with a unique frequency label (e.g., 322 Hz) was fed to each of the four coils, thus inducing a measurable magnetic field and thereby allowing each coil to be localized in reference to the MEG sensor array throughout the recording session. Structural T1-weighted images were collected using a 3D-fast-field echo sequence on a Philips Achieva 3.0T X-Series scanner with an eight-channel head coil (Philips Healthcare, Best, Netherlands). The parameters for the 3D-fast-field echo sequence were as follows: repetition time (TR): 8.09 ms; echo time (TE): 3.7 ms; field of view: 24 cm; matrix: 256 × 256; slice thickness: 1 mm with no gap; in-plane resolution: 0.9375 × 0.9375 mm; sense factor: 1.5 (Lew et al., 2021 (link); Schantell et al., 2021 (link)).
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Multimodal Neuroimaging Acquisition Protocol
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Corresponding Organization : Creighton University
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Variable analysis
independent variables
- Attachment of four coils to the participant's head and their localization along with fiducial and scalp surface points using a 3D digitizer
- Measured magnetic fields induced by the electric current fed to the four coils
- Use of a one-layer magnetically shielded room with active shielding engaged
- Sampling rate of 1 kHz
- Acquisition bandwidth of 0.1–330 Hz
- Structural T1-weighted images collected using a 3D-fast-field echo sequence on a Philips Achieva 3.0T X-Series scanner with an eight-channel head coil
- Positive control: Feeding an electric current with a unique frequency label (e.g., 322 Hz) to each of the four coils, thereby inducing a measurable magnetic field and allowing each coil to be localized in reference to the MEG sensor array throughout the recording session
- Negative control: Not explicitly mentioned
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