Poster C29, Sunday, March 25, 1:00-3:00 pm, Exhibit Hall C
Effective connectivity via brain oscillations during cognitive control post-concussion
Natasha Fansiwala1, Stephanie E. Barlow1, Paolo Medrano1, Robert S. Ross1; 1University of New Hampshire
Concussions may impact the brain through network activity alterations. Brain oscillations underlie how brain regions communicate with each other. Rule-switching requires engagement of cognitive control mechanisms, which are related to alpha (8-12 Hz) and beta (13-30 Hz) frequency bands. Therefore, concussions may impact rule-switching behavior through changes in effectivity connectivity in alpha and beta bands. The current study examined changes in effective connectivity in alpha and beta during a rule-switching task in participants that had suffered two or more concussions. Thirty-six participants, matched for age and gender, underwent EEG recording during a rule-switching task (n = 17 controls, n = 19 with concussion). Unique visual stimuli containing red or green, and circle or square dimensions were presented on every trial. A cue was given prior to each stimulus presentation informing participants which rule to use on the current trial. The rule changed after 3-5 trials which were named switch trials. The data was analyzed using MATLAB with the EEGLAB plugin groupSIFT. These preliminary results show that accuracy during switch trials is less for those with concussions compared to controls. Additionally, results suggest there may be an effective connectivity difference from left frontal superior cortex to right insula at 750 ms post-cue in the beta band in people with multiple concussions. There may also be effective connectivity differences between left insula to right postcentral cortex 650-900 ms post-cue in the alpha and beta band. These results may suggest that concussions change network activity in oscillatory bands associated with control.
Topic Area: EXECUTIVE PROCESSES: Goal maintenance & switching