The Neuromodulation Method Biasing Arm Choice

Towards a Novel Rehabilitation Approach for Non-Use of the Paretic Arm

Abstract

In our daily lives, we unconsciously chose left or right arm when performing tasks such as reaching for a cup in front of us. While rehabilitation can partially restore the function of a paretic arm following a stroke, some patients tend to rely on their nonparetic arm and neglect using the paretic arm when not explicitly prompted. This lack of use hinders the recovery of the paretic arm's functionality. Therefore, it is crucial to propose interventions that encourage the unconscious use of the paretic arm, even in situations where its use is not mandatory. This study focuses on the neural mechanisms associated with arm choice and investigates neuromodulation methods that can bias arm choice. The paper summarizes the factors influencing arm choice and presents our research findings on the effects of transcranial direct current electrical stimulation targeting the posterior parietal cortex in influencing arm choice.