About 17 to 38 percent of healthy people experience visual hallucinations at some point. Here's why that matters.
In the study, data from 466 volunteers with a mean age of about 21 years were collected by the scientists. Each volunteer filled out a questionnaire called MUSEQ . The MUSEQ contained questions like “I Have seen lights, flashes, or other shapes that other people could not see.”
For each question, volunteers had to indicate whether they had that experience"never,""hardly ever,""rarely,""occasionally," or"frequently." Next, the scientists asked the volunteers a few follow-up questions to determine whether an experience would adhere to a clinical definition of visual hallucinations—for example, whether they experienced the hallucinations while fully conscious or not.
Overall, 84.8 percent of the volunteers that took part in the study reported having experienced some form of anomalous visual experiences in their life. More than a third of them reported that they had experienced an actual visual hallucination similar to what a patient with a psychotic disorder may experience. When the scientists analyzed the additional questions of whether an experience would agree with a clinical definition of visual hallucinations, about 17.
When asked further about their experiences, most volunteers in the study reported that the hallucinations primarily happened when they were alone and in the evening. When asked to speculate on possible reasons for the hallucinations, most volunteers indicated that they were either tired or their minds were"playing tricks on them." However, some volunteers also reported that they felt the hallucination may be a threat to their mental health and were quite distressed by it.
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