Action Observation as a Rehabilitation Intervention for Stroke

Study Summary

One way to help a stroke survivor learn how to use their arm and hand again is to have them watch and replicate "normal" arm and hand movements. This type of intervention is called action observation (AO) and has emerged as a potentially powerful therapeutic tool to improve stroke rehabilitation for the weakened arm and hand. AO involves the patient's visual observation of video recorded intact body movements with the intent to perform the same task with their weakened arm and hand. There is behavioral evidence in stroke survivors that movement skills usually gained through physical practice can also be acquired through observation of the skill alone. In preliminary research performed in Dr. Lewis Wheaton's lab at Georgia Tech, AO has been successfully implemented for persons with arm and hand amputations learning how to use their prostheses. AO training in patients with amputations revealed that their movement is improved when they focus their eye gaze on specific aspects of the movement in the video that may maximally benefit the patient. It is unknown if these eye gaze patterns may serve as the mechanism behind AO and differ among those with mild or moderate movement impairments due to stroke. In this study, the investigators seek to identify if experience with AO in stroke survivors with varying levels of impairment has a similar emergence of eye gaze patterns found in people with amputations. The investigators hypothesize that AO augments visuomotor strategies to help support improved movement and enhance rehabilitation strategies in stroke survivors with mild and moderate impairments. The goal of this work is to utilize eye gaze tracking approaches to understand this phenomenon. In addition, the investigators will identify the feasibility of implementing and assessing AO on eye gaze in stroke survivors.

Primary Outcome

Eye gaze patterns will be collected with a Pupil Labs Eye Camera (Berlin, Germany; 200 Hz, binocular) throughout the experiment. The participants will don eye tracking glasses that feature two pupil cameras which track the participants' pupils relative to the world, which records what participants see in their line of vision. Eye gaze will identify areas of interest of the SRTT (movement task).

Interventions

• BEHAVIORAL Action observation