Primary Inclusion Criteria:  stroke > 1 year previously mild-to-moderate general cognitive impairment as determined by a Montreal Cognitive Assessment (MOCA) score between 10-26 impairment in cognitive processing speed; this will be determined by a time greater than 100 ms on Task 2 and greater than 300 ms on Task 3 of the Useful Field of View (UFOV) test some impairment in performance of daily activities; this will be determined by a score of 3 or below on the Cognitive Task Activity Log (CTAL)  Additional Inclusion Criteria:  40 years or older; no upper limit if medically stable sufficiently fit, from both a physical and mental health perspective, to take part in study adequate sight and hearing to complete UFOV test adequate thinking skills, e.g., ability to follow directions, retain information, to complete UFOV and CTAL, as marked by judgement of the screener that the candidate is able to adequately complete the UFOV and CTAL reside in the community (as opposed to a hospital or skilled nursing facility) able to travel to laboratory on multiple occasions caregiver available  Exclusion Criteria:  cognitive impairment due to a developmental disability, psychiatric disorder, or substance abuse or due to another type of brain injury, such a traumatic brain injury, or a progressive brain disease, such as Alzheimer's Dementia