Two features of the interictal behavior syndrome are relevant: hypergraphia or the tendency to write compulsively and often repetitively, and verbosity or loquaciousness, the tendency to be overly talkative, rambling, and circumstantial in speech.
Source: wiktionary
There is some suggestion that hypergraphia is associated with non-dominant hemisphere temporal lobe disturbances (Trimble, 1986c).
Source: wiktionary
Two cases of mania and hypergraphia in patients with temporal lobe epilepsy were reported by Sanders and Mathews (1994). In the first case, a 58-year-old right-handed man suffered a ruptured right middle cerebral artery aneurism, which required a craniotomy. During interictal periods, the patient demonstrated hypergraphia, as well as several episodes of alternating manic and mildly depressive phases.
Source: wiktionary