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Published online by Cambridge University Press: 11 August 2003
Catatonia resulting from a general medical condition (as defined in the DSM-IV) seems to account for a large percentage of patients presenting with catatonia in psychiatric settings. In view of Dr. Northoff's hypothesis, it is important to emphasize that medical catatonias provide additional information to support his neuropsychiatric hypothesis of the anatomical and biochemical mechanisms of catatonia.