BreEStim for Motor Recovery in Chronic Stroke With Severe Impairment (Pilot)

Inclusion criteria: * has post stroke ≥ 6 months , medically stable; * Unilateral, single stroke (no restriction on type (ischemic or hemorrhagic) or volume (large or small) of stroke); * MAS score ≥ 1, i.e., detectable finger flexor hypertonia; Exclusion criteria include: * Patients with visual deficit/neglect; hearing or cognitive impairment; * Patients with history of pulmonary disease (Asthma, chronic obstruction pulmonary disease, COPD); * Patients that are currently adjusting tone alternating medications (e.g., baclofen), or * Patients received botulinum toxin injection to the arm/fingers \<4 months, or phenol injections \< 2 years; * Patients with a pacemaker; * Women who are pregnant.