Abstract
Objectives
Idiopathic rapid eye movement (REM) sleep behavior disorder (iRBD) is characterized by vocalizations, jerks, and motor behaviors during REM sleep, often associated with REM-related dream content, which is considered a prodromal stage of α-synucleinopathy. The results of the Reading the Mind in the Eyes (RME) reflecting affective Theory of Mind (ToM) are inconsistent in α-synucleinopathy. The present study tried to investigate the RME in patients with iRBD.
Methods
A total of 35 patients with iRBD and 26 healthy controls were included in the study. All participants were administered the RME and the cognitive assessments according to a standard procedure. The patients with iRBD were further divided into two groups (high or low RME) according to the scores of the RME (> 21, or ≤ 20).
Results
The patients with iRBD had worse scores on cognitive tests compared with healthy controls involving global cognitive screening, memory, and visuospatial abilities (p < 0.05), but the scores of the RME were similar between the two groups (20.83 ± 3.38, 20.58 ± 3.43) (p ˃ 0.05). Patients with low RME had more obvious cognitive impairments than healthy controls. After applying Bonferroni correction for multiple tests, the low REM group only performed worse on the Sum of trials 1 to 5 and delayed recall of the RAVLT compared with the healthy control group (p < 0.001, = 0.002). The RME correlated with the scores of cognitive tests involving executive function, attention, memory, and visuospatial function.
Conclusions
The changes in RME had a relationship with cognitive impairments, especially memory, in patients with iRBD.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding
This work was supported by Key Projects of Strategic International Cooperation in Scientific and Technological Innovation in the National Key Research and Development Program (2018YFE0203600), Key Area in Research and Development Program of Guangdong Province (2018B030336001), and Personnel development funding projects of Beijing Dongcheng District (DCQYYRC-791–01-DR).
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The objectives of the research were explained to participants and their families, and written informed consent was obtained. The research was approved by the Ethics Committee of the Beijing Tiantan Hospital.
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Li, X., Shen, M., Shen, Z. et al. Reading the mind in the eyes in patients with idiopathic REM sleep behavior disorder. Neurol Sci 45, 2697–2703 (2024). https://doi.org/10.1007/s10072-024-07303-3
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DOI: https://doi.org/10.1007/s10072-024-07303-3