the interest in TLE and religious experience in the 1960s. Dewhurst and Beard (1970) described six cases of TLE-patients who underwent sudden religious conversions. They placed these cases in the context of several western saints with a sudden conversion, who were or may have been epileptic. Dewhurst and Beard described several aspects of conversion experiences, and did not favor one specific mechanism. Norman Geschwind described behavioral changes related to temporal lobe epilepsy in the 1970s and 1980s. Geschwind described cases which included extreme religiosity, now called Geschwind syndrome, and aspects of the syndrome have been identified in some religious figures, in particular extreme religiosity and hypergraphia (excessive writing). 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. He questioned the earlier accounts of religious figures with temporal lobe epilepsy, noticing that "very few true examples of the ecstatic aura and the temporal lobe seizure had been reported in the world scientific literature prior to 1980". According to Fenwick, "It is likely that the earlier accounts of temporal lobe epilepsy and temporal lobe pathology and the relation to mystic and religious states owes more to the enthusiasm of their authors than to a true scientific understanding of the nature of temporal lobe functioning." The occurrence of intense religious feelings in epileptic patients in general is rare, with an incident rate of ca. 2-3%. Sudden religious conversion, together with visions, has been documented in only a small number of individuals with temporal lobe epilepsy. The occurrence of religious experiences in TLE-patients may as well be explained by religious attribution, due to the background of these patients. Nevertheless, the Neuroscience of religion is a growing field of research, searching for specific neurological explanations of mystical experiences. Those rare epileptic patients with ecstatic seizures may provide clues for the neurological mechanisms involved in mystical experiences, such as the anterior insular cortex, which is involved in self-awareness and subjective certainty. Anterior insula A common quality in mystical