Rapid eye movement (REM) sleep behavior disorder (RBD) is a parasomnia characterized by abnormal movement to reproduce dreams and loss of skeletal muscle tension during REM sleep. Idiopathic RBD (iRBD) refers to the absence of any predisposing factors or comorbid neurological disorders. iRBD is considered the prodromal stage of alpha-synucleinopathy.~Through past studies, it has been confirmed that cognitive function decline has already occurred in a significant number of iRBD patients. However, there is still no treatment that can suppress or delay the onset of neurodegenerative diseases.~The cognitive function improvement effect of computerized cognitive training in the elderly and patients with mild cognitive impairment is known. However, the effect of cognitive training on improving cognitive function in iRBD patients has not been studied.~The investigators developed a program that allows patients to train cognitive functions in various domains by repeatedly performing tasks related to daily life activities. In addition, by loading the program on the tablet computer, it is possible to participate in the training easily at home using the touch screen without visiting the hospital.
To evaluate the effectiveness of tablet computer-based cognitive training in patients with idiopathic REM sleep behavior disorder.