System and method for brain stimulation for improvement of motor symptoms in Parkinson's disease and other movement disorders

A system for treatment of Parkinson's disease in a subject comprising:

• a first controller containing instructions regarding a predetermined force value that the subject is asked to create;
• a force transducer device having a plurality of transducers and configured to accept and measure forces, wherein one of the transducers is for a left hand of the subject and another of the transducers is for the right hand of the subject, wherein the force transducer device is configured to transmit data related to the accepted force to the first controller, and wherein the force transducer device is configured to receive instructions from the first controller regarding the predetermined force value that the subject is asked to create;
• a second controller that uses the measured forces to compute a laterality index;
• and
• a transcranial direct current stimulator configured to apply transcranial direct stimulation to motor cortices of the subject according to the laterality index, wherein for the subject with a negative laterality index, anodal stimulation is applied to the right motor cortex, and cathodal stimulation is applied to the left motor cortex, and for the subject with a positive laterality index, anodal stimulation is applied over the left motor cortex, and cathodal stimulation is applied to the right motor cortex.