EEG Based Analysis of Cortical Activity during Mirror Visual Feedback Target-Directed Movement

Abstract

In mirror visual feedback (MVF) based rehabilitation, the illusion of mirror reflection of volitional movement of non-paretic limb tends to have a modulatory effect on visuomotor and sensorimotor brain activations. This paper presents EEG based analysis of hemispheric activation asymmetry within the beta band (15-28 Hz) when MVF is combined with a target-directed hand motor task in a block design versus a similar task without any target requirements. MVF coupled with targetdirected movement was associated with a decrease in hemispheric asymmetry in both preparation and execution phases of movement. These results emphasize the potential importance of incorporating visuomotor goals into the task to maximize the rehabilitation outcomes of MVFbased training activities. Numerous neuroimaging techniques, such as TMS, fMRI, MEG, in healthy and stroke population, have shown a modulatory effect of MVF, like increasing activation of the ipsilateral hemisphere or rebalancing abnormal interhemispheric dominance [3-5]. TMS

Spatial distribution and temporal evolution of EEG alpha rhythms related to sensory-motor tasks during Mirror Visual Feedback illusion

“…A bilateral alpha ERD in response to unilateral MVF movements started 0,5 s before the movement onset and lasted up to 1,5 s after that onset. The same temporal evolution has been demonstrated for the EEG central beta suppression 162 . These outcomes coincide with the temporal dynamics observed in Study I, describing an anticipatory suppression of the central alpha oscillation starting 1 s before the auditory cue triggering the movement up to more than 1 s after that cue.…”

“…As mentioned above, EEG can be used to map the scalp distribution of the alpha and beta band oscillations in response to sensory-motor events. In this context, the majority of the EEG studies observed a clear activity in the sensory-motor area ipsilateral to the moving limb and contralateral to the mirror illusion 72,74,160 or reduced asymmetry in the hemispheric activation at the central electrode sites (C3 or C4) [62][63][64]157,162 . In a comprehensive study, Al-Wasity and colleagues investigated the functional cortical domains related to the comparison of bimanual or unimanual+MVF tasks 74 .…”

The instant effect of embodiment via mirror visual feedback on electroencephalogram-based brain connectivity changes: A pilot study

“…Although many studies reported the ability of MVF on balancing hemisphere asymmetry and modulating hemispheric activation ( Rossiter et al, 2015 ; Bartur et al, 2018 ; Rohafza et al, 2019 ; Zhang and Fong, 2019 ), its effect on shifting network metrics is rarely reported. Thus, as an additional measure, the hemispheric asymmetry in metrics was analyzed for future study.…”

Novel Technologies Targeting the Rehabilitation of Neurological Disorders

“…Although many studies reported the ability of MVF on balancing hemisphere asymmetry and modulating hemispheric activation (Rossiter et al, 2015;Bartur et al, 2018;Rohafza et al, 2019;Zhang and Fong, 2019), its effect on shifting network metrics is rarely reported. Thus, as an additional measure, the 1 https://www.nitrc.org/projects/bct/ hemispheric asymmetry in metrics was analyzed for future study.…”