Inclusion Criteria:  1) within 1 month of right hemisphere stroke  2) suspected of having unilateral spatial neglect  3) able to provide consent  4) likely to remain in rehabilitation for 10-12 days or willing to return to the University to complete 10 sessions of treatment and post-treatment testing  5) able to have an MRI  6) will be or has been admitted to the Craig H. Neilson Rehabilitation Hospital for rehabilitation or is able to come to the Craig H. Neilson Rehabilitation Hospital for prism adaptation therapy sessions.  7) age 18-90 years  8) able to sit in a wheelchair or other chair for 1 hour  9) able to point straight ahead and hold a pen with right hand  Exclusion Criteria:  1) other neurologic, medical that would interfere with ability to complete the testing or training  2) no uncorrected visual or hearing problems, other than hemianopsia  3) contraindications to MRI  4) unable to provide consent due to significant aphasia or cognitive impairment