This research explored the post-stroke cognitive ability of a 52-year male, KM, who suffered a left middle cerebral artery stroke. KM received no rehabilitation post-stroke, as clinic assessments suggested that mental functioning had returned to an acceptable level. However, KM believed that his cognitive ability had not returned to pre-stroke levels. Comparisons with pre-stroke data from an unrelated study and additional testing using sensitive cognitive measures supported his observations. This research concludes that patient observations and more sensitive testing of post-stroke cognitive functioning may reveal additional high-level cognitive deficits.