I have seen a couple of psychosocial situations in my physical disability field work. One client was discharged from therapy because she was constantly agitated. She would perseverate on certain facts. In addition, she was paranoid about the therapists and other caregivers being out to get her. Most of the therapists believed that this behavior was related to her stroke. I saw another patient this Friday who was also post stroke and agitated. He had refused food all day and had not gotten out of bed. He was angry and threatening toward the staff. We needed to get him up to make adjustments to his WC. We faced some resistance, but we got him up and in the chair. In both of these cases, there is a relationship between the behavior and the CVA. This kind of behavior is hard to predict and difficult to manage.
Finally, here is a link to an article about a man who developed psychotic symptoms post CVA.