MEG data were collected on a 275-channel CTF system (MEG International Services Ltd., Coquitlam, BC, Canada) with a sampling rate of 1200 Hz. A covert verb generation task was used. Nouns and speech-shaped noise were auditorily presented to participants (71 nouns, 72 noise). Participants were instructed to think of a corresponding verb when they heard a noun, and provide no response when they heard noise. Stimuli were presented every 5 sec by an MEG-compatible, calibrated audio system that comprised distal transducers, tubing, and ear inserts (Etymotic Research, IL) and randomly alternated between conditions. During the MEG session, head localization coils were placed at nasion and periauricular points to monitor movement and facilitate coregistration between MEG and MRI.

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