The cognitive symptoms of stroke?

Cognition and stroke. Depends on where the stroke is. Small and more diffuse strokes may not have any other neurologic symptoms except memory loss or change in executive function (insight, judgement, more complex problem solving).
Variable. Not uncommon are issues with expression of speech and less commonly understanding of speech. Multiple small strokes can create a lacunar state causing a picture like alzheimer's disease, and not unique to have these both together. Other strokes cause problems with color perception, recognition, organizational skills, and abilty to perform sequential alternating activities, multi-tasking.