Cognitive Rehabilitation for Survivors of Childhood Medulloblastoma Using Real Time Hemodynamic Neurofeedback

Inclusion Criteria: * Age ≥ 10 and ≤ 25 years at the time of enrollment. * English as a primary language. * Current St. Jude participants who received treatment for medulloblastoma with upfront craniospinal radiotherapy (proton or photon), inclusive of SJMB12 participants and those treated as per SJMB12 at least 2 years from completion of treatment of their medulloblastoma. * Demonstrate working memory impairment based on age-appropriate questionnaire electronically administered pre-enrollment. Specifically, scores \>57 on the Working Memory Index of the BRIEF (places the individual in the top 25% of people who have difficulty with working memory tasks). Exclusion Criteria: * History of seizures, on or off antiepileptic drugs, in the past 3 months. * A premorbid history of significant neurological disease, including stroke or head injury with loss of consciousness. * A psychiatric condition that would preclude or take precedence over study participation (e.g., active psychosis, suicidal ideation). * Major sensory or motor impairment that would preclude valid cognitive testing secondary to inability to complete study procedures (e.g., blindness, paresis). * IQ \< 70 based on standardized testing routinely conducted on primary treatment protocols or as part of the New Oncology Program in Psychology (NOPP). * Metal or surgical implants that would prevent MRI scanning. * Inability or unwillingness of research participant or legal guardian/ representative to give written informed consent. * Pregnancy. The St. Jude IRB requires that a female participant of childbearing potential (generally \>10 yrs. old) must have a negative pregnancy test as a condition of clinical research eligibility. * Permanent orthodontic retainers or braces-shunt, anything else that would not be a safety risk but would impact image quality.