Norman Geschwind described behavioral changes related to temporal lobe epilepsy in the 1970s and 1980s. Now called Geschwind syndrome, he defined a cluster of specific personality characteristics often found in patients with temporal lobe epilepsy, which include increased religiosity. Evidence of Geschwind syndrome has been identified in some religious figures, in particular pronounced religiosity and hypergraphia (excessive writing). However, critics note that these characteristics can be the result of any illness, and are not sufficiently descriptive for patients with temporal lobe epilepsy.