Objectives: Idiopathic REM sleep behavior disorder (iRBD) patients are susceptible to cognitive deficits, especially attention dysfunction. The objective of this study is to elucidate the neural mechanism of the dysfunction in attention known as ‘inhibition of return’ (IOR) in iRBD patients based on an analysis of oscillatory cortical activity during a selective attention task. Methods: Event-related potentials (ERPs) were recorded from iRBD patients and normal control subjects while performing a Posner task. The differences in N1 ERP and theta- and beta-bands event-related spectral perturbations (ERSPs) between valid and invalid stimuli were compared between groups. Results: The N1 amplitude was significantly higher for the invalid stimuli in controls, while the valid-invalid difference was not significant in iRBD patients. The valid-invalid differences in ERSPs were prominent in controls at ∼100–400 ms for the theta-band and ∼200–400 ms for the beta-band, and the valid-invalid differences in ERSPs were not significant in the iRBD patients. Conclusion: The results demonstrated that valid-invalid differences in neural activity were absent in iRBD patients, and these neural findings were in accord with the behavioral results. Significance: Our findings imply impairment in sensory-perceptual processing mediated by attentional control and response inhibition in early-stage iRBD before clinical neurodegeneration.
Bibliographical noteFunding Information:
This research was supported by the Brain Research Program through the National Research Foundation of Korea (NRF) grants funded by the Minister of Science, ICT and Future Planning, Republic of Korea (No. NRF-2014R1A2A2A04003858; 2017M3C7A1029485).
This research was supported by the Brain Research Program through the National Research Foundation of Korea (NRF) grants funded by the Minister of Science, ICT and Future Planning, Republic of Korea (No. NRF-2014R1A2A2A04003858; 2017M3C7A1029485). None of the authors have potential conflicts of interest to be disclosed.
© 2019 International Federation of Clinical Neurophysiology
All Science Journal Classification (ASJC) codes
- Sensory Systems
- Clinical Neurology
- Physiology (medical)