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Flickering Stimuli Do Not Reliably Induce Visual Hallucinations in Parkinson's Disease
Angeliki Zarkali1, Andrew J Lees2, Rimona S Weil1,3
1Dementia Research Centre, University College London, London, UK.
Journal of Parkinson'S Disease
|June 23, 2019
Summary
Flickering lights can trigger visual hallucinations in Parkinson's disease patients, but not the typical complex hallucinations associated with the condition. Further research is needed to understand these visual disturbances.
Area of Science:
- Neuroscience
- Ophthalmology
- Neurology
Background:
- Visual hallucinations are a common and distressing symptom in Parkinson's disease.
- These hallucinations are often transient and difficult to study, but are more frequent in low light.
- Flickering stimuli can induce simple visual hallucinations in healthy individuals.
Purpose of the Study:
- To investigate the effect of flickering stimuli on visual hallucinations in Parkinson's disease.
- To determine if artificial flickering light can induce Parkinson's-associated visual hallucinations.
Main Methods:
- 16 participants were tested: 7 with Parkinson's and visual hallucinations, 6 with Parkinson's but no hallucinations, and 3 controls.
- A stroboscope and a full-screen flickering stimulus were used.
- Participants' responses to the flickering stimuli were recorded.
Main Results:
- Both flickering stimuli induced geometrical hallucinations in 25% of participants.
- One participant experienced complex hallucinations.
- Neither stimulus induced the typical visual hallucinations associated with Parkinson's disease.
Conclusions:
- Flickering stimuli can induce simple visual hallucinations in individuals with and without Parkinson's disease.
- The study did not replicate typical Parkinson's-associated visual hallucinations using artificial flickering light.
- Further investigation is required to understand the mechanisms underlying Parkinson's disease visual hallucinations.