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Impaired decision-making in idiopathic REM sleep behavior disorder
Taeko Sasai1, Tomoyuki Miyamoto, Masayuki Miyamoto
1Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan. taeko_ssi@yahoo.co.jp
Sleep Medicine
|January 31, 2012
Summary
Patients with REM sleep behavior disorder (RBD) show impaired decision-making abilities, even before developing Parkinson's disease (PD). This cognitive deficit appears independent of olfactory function in idiopathic RBD patients.
Area of Science:
- Neurology
- Sleep Medicine
- Cognitive Neuroscience
Background:
- REM sleep behavior disorder (RBD) is a precursor to Parkinson's disease (PD).
- Cognitive impairments, particularly in decision-making, are common in PD.
- Investigating early cognitive changes in idiopathic RBD (iRBD) is crucial for understanding PD development.
Purpose of the Study:
- To assess decision-making ability in patients with idiopathic RBD (iRBD).
- To examine the relationship between decision-making and olfactory function in iRBD.
- To explore correlations between cognitive function and clinical variables in iRBD.
Main Methods:
- Utilized the Iowa Gambling Task (IGT) to evaluate decision-making.
- Employed the Sniffin' Stick Test to assess olfactory function.
- Compared 38 iRBD patients with 34 age-matched healthy controls (HC).
Main Results:
- iRBD patients exhibited significantly lower overall IGT scores compared to HC.
- Lower IGT performance was observed in the initial, third, and final blocks for iRBD patients.
- No significant association was found between IGT scores, olfactory function, or clinical RBD variables within the iRBD group.
Conclusions:
- Impaired decision-making in iRBD may precede Parkinson's disease diagnosis.
- Decision-making deficits in iRBD appear to be independent of olfactory dysfunction.
- Cognitive decline in iRBD may not correlate with disease progression or olfactory deficits.
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