Investigation on the Cortical Communication (CortiCom) System

Eligibility Criteria

• * Clinical diagnosis of tetraplegia (quadriplegia), brainstem stroke , amyotrophic lateral sclerosis (ALS) or Locked-in Syndrome (LIS)
• * Tetraplegia diagnosis, ALS diagnosis, stroke, or LIS etiology onset occurred at least one year prior to enrollment
• * Complete or incomplete tetraplegia (quadriplegia), tetraparesis (quadriparesis), or severe ataxia. In addition, these motor impairments may be combined with severe motor-related speech impairment (dysarthria or anarthria), as in LIS.
• * 22-70 years
• * Meeting surgical safety criteria, including surgical clearance by the participant's primary healthcare provider, study physicians, and any necessary consultants
• * Ability to communicate reliably, such as through eye movement
• * Willingness and ability to provide informed consent
• * Screened by rehabilitation psychologist with a result showing that the participant has a stable psychosocial support system with caregiver capable of monitoring participant throughout the study
• * Ability and willingness to travel up to 100 miles to study location up to three days per week for the duration of the study
• * Ability to understand and comply with study session instructions
• * Participant consents to the study and still wishes to participate at the time of the study
• * Performance on formal neuropsychological testing that indicates significant psychiatric conditions or cognitive impairments that would interfere with obtaining informed consent or fully participating in study activities.
• * Suicide attempt or persistent suicidal ideation within the past 12 months.
• * Implanted devices that are incompatible with MRI, which may include pacemakers, cardiac defibrillators, spinal cord or vagal nerve stimulators, deep brain stimulators, and cochlear implants.
• * History of substance abuse, narcotic dependence, or alcohol dependence in past 24 months
• * Medical conditions contraindicating surgery of a chronically implanted device (e.g. osteomyelitis, diabetes, hepatitis, any autoimmune disease/disorder, epilepsy, skin disorders causing excessive skin sloughing or poor wound healing, blood or cardiac disorder requiring chronic anti-coagulation)
• * Other chronic, unstable medical conditions that could interfere with subject participation.
• * Presence of pre-surgical findings in anatomical, functional, and/or vascular neuroimaging that makes achieving implant locations within desired risk levels too challenging (to be decided by neurological and neurosurgical team)
• * Prior cranioplasty
• * Inability to undergo MRI or anticipated need for an MRI during the study period
• * Participants with active infections or unexplained fever
• * Participants with other morbid conditions making the implantation of the recording elements unsafe; not limited to: significant pulmonary, cardiovascular, metabolic, or renal impairments making the surgical procedure unsafe
• * Pregnancy (confirmation through blood test)
• * Nursing an infant, planning to become pregnant, or not using adequate birth control
• * Corrected vision poorer than 20/100
• * HIV or AIDS infection
• * Existing scalp lesions or skin breakdown
• * Chronic oral or intravenous use of steroids or immunosuppressive therapy
• * Active cancer within the past year or requires chemotherapy
• * Uncontrolled autonomic dysreflexia within the past 3 months
• * Hydrocephalus with or without an implanted ventricular shunt
• * Participants in whom it is medically contraindicated to stop anti-coagulant medications during surgery