A disorder of thinking or mental functioning, sometimes used to describe disturbances in thought processes or mild cognitive impairment.
From Greek 'dys-' (bad/difficult) and 'phrenia' (mind/thinking). This term emerged in 19th-century psychiatry to describe various thinking disorders, though it's now largely obsolete in clinical use.
Dysphrenia sits in medical history alongside terms like 'dementia praecox'—these words remind us that as neuroscience advanced, we realized different 'thinking disorders' had completely different causes, requiring more precise terminology.
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