A client reports that she is under the surveillance of the police and that they have been following her for days, as well as listening in on her phone conversations. There is no other evidence to support this belief. The client’s report is MOST likely resulting from a _________.

A delusion is a false or erroneous belief that usually involves a misinterpretation of perceptions or experiences. A delusion is a belief that is held despite evidence to the contrary. A hallucination involves the senses. An auditory hallucination—hearing something that is not said—is the most common type. In this case vignette, the client had a false, fixed belief despite a lack of supporting evidence, but there was no indication that it resulted from actually seeing or hearing anything that would support these beliefs.