A self-disorder, also called ipseity disturbance, is a psychological phenomenon of disruption or diminishing of a person’s sense of minimal (or basic) self. The sense of minimal self refers to the very basic sense of having experiences that are one’s own; it has no properties, unlike the more extended sense of self, the narrative self, which is characterized by the person’s reflections on themselves as a person, things they like, their identity, and other aspects that are the result of reflection on one’s self. Disturbances in the sense of minimal self, as measured by the Examination of Anomalous Self-Experience (EASE),[2] aggregate in the schizophrenia spectrum disorders, to include schizotypal personality disorder, and distinguish them from other conditions such as psychotic bipolar disorder and borderline personality disorder.

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