Following previous sample sizes of MEG studies that used MI to study speech tracking [2 (link),22 ], as well as previous recommendations [71 (link),72 (link),73 (link)], 20 healthy, native British participants took part in the study (9 female, age 23.6 ± 5.8 years [mean ± SD], age range: 18 to 39 years). All participants were right-handed [Edinburgh Handedness Inventory; 74 (link)], had normal hearing [Quick Hearing Check; 75 (link)], and normal or corrected-to-normal vision. Furthermore, participants had no self-reported current or previous neurological or language disorders.
MEG was recorded with a 248-magnetometer, whole-head MEG system (MAGNES 3600 WH, 4-D Neuroimaging, San Diego, CA) at a sampling rate of 1 KHz. Head positions were measured at the beginning and end of each run, using 5 coils placed on the participants’ heads. Coil positions were codigitised with head shape (FASTRAK, Polhemus Inc., Colchester, VT). Participants sat upright and fixated at a fixation point projected centrally on screen with a DLP projector. Sounds were transmitted binaurally through plastic earpieces, and 3.7 m–long plastic tubes connected to a sound pressure transducer. Stimulus presentation was controlled with Psychophysics toolbox [76 (link)] for MATLAB (The MathWorks, Inc., Natick, MA).
MEG was recorded with a 248-magnetometer, whole-head MEG system (MAGNES 3600 WH, 4-D Neuroimaging, San Diego, CA) at a sampling rate of 1 KHz. Head positions were measured at the beginning and end of each run, using 5 coils placed on the participants’ heads. Coil positions were codigitised with head shape (FASTRAK, Polhemus Inc., Colchester, VT). Participants sat upright and fixated at a fixation point projected centrally on screen with a DLP projector. Sounds were transmitted binaurally through plastic earpieces, and 3.7 m–long plastic tubes connected to a sound pressure transducer. Stimulus presentation was controlled with Psychophysics toolbox [76 (link)] for MATLAB (The MathWorks, Inc., Natick, MA).
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