This study confirms the heterogeneity of pseudoseizure patients as having multiple types and coexistent mechanisms of symptom generation. It argues that the complexity of pseudoseizure symptoms is best described by a diagnostic system that can integrate physiological variables with variables observed in the interpersonal ecology of the symptom. Seven mind-body patterns of symptom generation are presented as an ecosystemic diagnostic system for classifying symptom mechanisms in pseudoseizure patients. These symptom patterns were evaluated in 27 pseudoseizure patients using operational diagnostic criteria. Twenty-four of the patients had either a mimicry pattern or a captured symptom pattern as the predominant pattern of symptom generation. Fourteen patients had more than one pattern maintaining the symptom behavior. Of the patients with a captured symptom pattern, all but one had a DSM-III-R diagnosis of Conversion Disorder, while the patients with a mimicry pattern had psychiatric diagnoses of Undifferentiated Somatoform Disorder, Somatization Disorder, and Factitious Disorder. The patients with a captured symptom pattern were rated as significantly less impaired than were the patients with a mimicry pattern on the Global Assessment Scale that assesses the severity of symptoms.True epilepsy consists of the simultaneous appearance of an electrical "storm" in the brain as measured by an electroencephalogram and a convulsion or its equivalent. When the paroxysm is of altered behavior or sensation, we speak of psychomotor equivalents, and these correlate with the electrical activity in the brain, that is, with typical neurophysiological changes.