Poster B123, Sunday, March 26, 8:00 – 10:00 am, Pacific Concourse
Lateralization of hand-related movement imagery: An EEG study
Chris Donoff1, Chris Madan1,2, Sarah Elke1, Anthony Singhal1; 1University of Alberta, 2Boston College
It is well known that overt movements arise from the activation of the primary motor cortex (M1) and supplementary motor areas in the precentral region of the brain. Prior EEG studies have reported lateralized desynchronization in mu (8–13 Hz) and beta (14–25 Hz) rhythms over M1, reflecting an active neural state for movement preparation and execution, followed by a synchronization of beta rhythms indicative of movement termination. These event-related desynchronizations and synchronizations have also been shown to occur during imagined movements. The majority of these studies have utilized subjective measures of movement imagery ability, introducing potential biases of confidence and social desirability that may confound performance measures. Here, we used an objective test of movement imagery to extend previous findings of contralateral dominance of mu and beta desynchronizations and ipsilateral dominance of mu synchronizations, with the added goal of relating oscillatory power with individual movement imagery ability. EEG data was recorded using a 256-channel array, while participants complete two objective movement imagery questionnaires, the Test of Ability in Movement Imagery (TAMI) for whole body movements, a novel hand-specific test inspired by the TAMI, and the Edinburgh Handedness Inventory. The results show consistent lateralization of ERD using the Better OSCillation (BOSC) detection method. The novelty of the present study arises from our ability to analyze EEG power as a function of imagery performance as well as handedness. We suggest that an objective test of imagined hand movements can provide a skill-based measurement of handedness.
Topic Area: PERCEPTION & ACTION: Motor control