We measured motor-related brain activity (reflected by a desynchronization in the 渭聽frequency bands; 8-12聽Hz range) localized at centro-parietal and fronto-central electrodes. We compared activity from viewing the videos to activity resulting from processing the language stimuli only. At centro-parietal electrodes, stable action-related 渭 suppression was observed during viewing of videos in each test-session of the two days. For processing of verbal stimuli associated with motor actions, a similar pattern of activity was evident only in the second test-session of Day 1. Over the fronto-central regions, 渭 suppression was observed in the second test-session of Day 2 for the videos and in the second test-session of Day 1 for the verbal stimuli.
Whereas the centro-parietal 渭 suppression can be attributed to motor events actually experienced during training, the fronto-central 渭 suppression seems to serve as a convergence zone that mediates underspecified motor information. Consequently, sensory-motor reactivations through which concepts are comprehended seem to differ in neural dynamics from those implicated in their acquisition.