Science, Space and Technology News 2024
Research reveals that presence hallucinations, especially in Parkinson’s disease, lead to significant overestimation of people in a room, tested through a novel virtual reality and robotics technique, highlighting a social-perception bias and potential early marker of cognitive decline.If you had to estimate the number of people in a room, without counting them one-by-one, by nature you would overcount them.
The category of hallucinations investigated by the neuroscientists is called presence hallucinations, for which people report an invisible presence next to them, even though no one is there. Such hallucinations are considered to be minor compared to visual hallucinations for instance. They may be experienced early on in patients with Parkinson’s disease, sometimes even before diagnosis. Presence hallucinations are also a known early marker of cognitive decline in Parkinson’s disease.
The platform provides an almost automated way of determining if someone is susceptible to hallucinations, in contrast to current methods that range from simply asking someone if they experience hallucinations, to questionnaires or other methods that involve subjective analysis by medical specialists.
Some 170 patients with Parkinson’s disease were recruited for the online test, of which 69 of them had presence hallucinations. With this version of the test, the scientists also found that patients with presence hallucinations overcount more than patients without hallucinations. Some patients with reported seeing as many as 11 or more people when only 8 were shown.
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