A patient's language disturbance following a confirmed stroke is disproportionate to any accompanying disorganisation of his broader thinking. Why is this disproportion clinically significant?
A language disturbance that is disproportionate to any accompanying disorganisation of broader thinking is exactly what would be expected from a focal neurological lesion selectively affecting language areas — this is the core reasoning that separates aphasia from a psychiatric thought disorder like schizophasia, which would tend to affect the structure of thinking more broadly rather than language so selectively.
References
- Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 4, 'Disorders of Thought and Speech'.