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Reduced susceptibility to experimentally-induced complex visual hallucinations with age
Oris Shenyan1, Laura Haye2, Georgia A Milne1
1Experimental Psychology, Division of Psychology and Language Sciences, University College London, London, UK; Institute of Ophthalmology, University College London, London, UK.
Summary
Older adults report fewer complex visual hallucinations than younger adults. This reduction in hallucination proneness appears to be a normal part of aging, not explained by cognitive or sensory changes.
Area of Science:
- Neuroscience
- Psychology
- Gerontology
Background:
- Visual hallucinations can occur in various conditions and be experimentally induced.
- Lifespan changes in hallucination proneness are not well understood, with prior studies yielding mixed results.
- Age-related sensory changes and reliance on prior knowledge may influence hallucination proneness.
Purpose of the Study:
- To investigate how hallucination proneness changes across the adult lifespan.
- To compare complex and simple hallucination experiences in younger and older healthy adults.
- To determine if cognitive or sensory factors mediate age-related differences in hallucination proneness.
Main Methods:
- Studied 44 healthy adults (19-79 years) divided into younger (19-39) and older (59-79) groups.
- Quantified hallucination proneness using an experimental environment designed to elicit hallucinations.
- Assessed cognitive and sensory measures including visual acuity, contrast sensitivity, and suggestibility.
Main Results:
- Older adults reported significantly fewer complex hallucinations compared to younger adults.
- This difference was observed in both real-time reporting and retrospective accounts.
- No tested cognitive or sensory measures mediated the relationship between age and complex hallucination proneness.
Conclusions:
- Reduced proneness to complex hallucinations is likely a characteristic of typical aging.
- Experiencing hallucinations in older individuals may indicate underlying pathology rather than normal aging.
- Further research is needed to understand the mechanisms behind age-related changes in hallucination proneness.
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