'''Transpersonal Psycheidetic Seizure Disorder''', also called '''Psycheidetic Epilepsy''' or '''Mirror Neuron Epilepsy''' is a variety of [http://en.wikipedia.org/wiki/Epilepsy epilepsy] characterized by frequent [[Pseudo Tonic Clonic Seizure|pseudo tonic-clonic seizures]] originating in the [http://en.wikipedia.org/wiki/Premotor_cortex premotor cortex] and [http://en.wikipedia.org/wiki/Parietal_lobe inferior parietal cortex], areas of the brain thought to contain the neuronal assemblies that give rise to [http://en.wikipedia.org/wiki/Mirror_neuron mirror neuron] activity in humans.
This diagnosis is controversial because the first descriptions of the disease by [[Kyojio Niide]] stated that the seizures were caused by the entire consciousness of another person (the '''co-patient''') superimposing itself on the patient. Although Niide rejected any [http://en.wikipedia.org/wiki/Paranormal paranormal] explanation for the condition, even coining the term psycheidetic to separate it from such associations, his insistence that the neural events of a seizure were disruptions of the patient's consciousness by neural events identical to the co-patient's consciousness caused the diagnosis to be met with skepticism and derision. As the incidence of pseudo tonic-clonic seizures increased, however, Niide's terminology came into general use, even among neurologists who rejected Niide's analysis of neural activity during a seizure. Other neurologists, including many who originally rejected Niide's analysis, have since taken the position that the condition is proof of the existence of [http://en.wikipedia.org/wiki/Psi_%28parapsychology%29 Psi] abilities in humans.
Niide remains faithful to his original position: Psi abilities do not exist, and any experience of another's consciousness must necessarily result in profound neurological dysfunction ([[Niide's hypothesis]]). This has led to further controversies over the prognosis and treament of the condition.