In 2019, investigators from the University of Oregon in Eugene conducted a study in mice to try to find out how hallucinations manifest in the brain. Researchers have been trying to build a better understanding of the biological mechanisms behind the different types of hallucinations. The condition could be related to overactive odor-sensing cells in the nasal cavity or perhaps a malfunction in the part of the brain that understands odor signals,” says first author Kathleen Bainbridge, Ph.D., from the National Institute on Deafness and Other Communication Disorders at the National Institutes of Health (NIH) in Bethesda, MD. “The causes of phantom odor perception are not understood. However, when it came to explaining this phenomenon, the researchers were at a loss. This percentage is based on data from a cohort of 7,417 participants with a mean age of 58 years. In 2018, a study published in JAMA Otolaryngology - Head & Neck Surgery showed that 6.5% of people aged 40 years and over had experienced phantom odor perception. Phantom smells also seem to be a more common occurrence than people might think. In a cohort of 2,533 individuals, the “current lifetime prevalence of was 7.3%.” Research published in the Scandinavian Journal of Psychology in 2015 also showed that auditory hallucinations were surprisingly common in a representative sample of the general population in Norway. “Our research is valuable because it can show them they are not alone and that having these symptoms is not necessarily associated with having a mental health disorder. Kelleher observed in an interview for International Business Times. They can be frightening experiences, and few people openly talk about it,” Dr. “Hallucinations are more common than people realize. They also found that more than 4% of all the survey respondents - including those who had no diagnosed mental health issues - reported experiencing visual or auditory hallucinations. Kelleher and DeVylder found that visual and auditory hallucinations were almost equally prevalent among participants with borderline personality disorder and those with a nonpsychotic mental illness. These data included information on the mental health of 7,403 people aged 16 years and older throughout 1 year.ĭr. Ian Kelleher, from the Royal College of Surgeons in Ireland, and Jordan DeVylder, Ph.D., from the University of Maryland in Baltimore - analyzed data that they had obtained through the 2007 Adult Psychiatric Morbidity Survey, a nationally representative study of mental health in England. A study that appeared in the British Journal of Psychiatry in 2017 suggests that hallucinations are far more common among people without psychotic disorders than scientists had previously thought.
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