Following a confirmed stroke affecting the language areas of the brain, a patient produces severely disorganised, hard-to-follow speech, and also shows clear difficulty with everyday practical tasks that require following instructions, alongside evident frustration at his own communication difficulties. Before revealing the answer: is this schizophasia?

No, this is more consistent with aphasia than with schizophasia. There is a confirmed focal neurological cause (the stroke) here, and critically, practical functioning is also impaired, unlike the marked discrepancy between severely disorganised speech and preserved non-verbal functioning that characterises schizophasia. The evident frustration at his own difficulties is also more typical of an aphasic language disturbance than of the disorganised, thought-disorder-driven speech of schizophasia.