 Geschwind introduced this "interictal personality disorder" to neurology, describing a cluster of specific personality characteristics which he found characteristic of patients with temporal lobe epilepsy.Critics note that these characteristics can be the result of any illness, and are not sufficiently descriptive for patients with temporal lobe epilepsy.Neuropsychiatrist Peter Fenwick, in the 1980s and 1990s, also found a relationship between the right temporal lobe and mystical experience, but also found that pathology or brain damage is only one of many possible causal mechanisms for these experiences.