Hypergraphia is a form of increased writing activity. It has been suggested that it should refer specifically to all transient increased writing activity with a noniterative appearance at the syntactic or lexicographemic level (cf. automatic writing behavior). Hypergraphia may be seen as part of the interictal psychosis which sometimes develops in patients with complex partial seizures from a temporal lobe (especially nondominant hemisphere) focus, or with other nondominant temporal lobe lesions (vascular, neoplastic, demyelinative, neurodegenerative), or psychiatric disorders (schizophrenia). Hypergraphia is a feature of Geschwind’s syndrome, along with hyperreligiosity and hyposexuality.
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Van Vugt P, Paquier P, Kees L, Cras P. Increased writing activity in neurological conditions: a review and clinical study. Journal ofNeurology, Neurosurgery and Psychiatry 1996; 61: 510-514