Eye-Fixation-Related Potentials (EFRPs) As a Predictor of Human Error Occurrences During a Visual Inspection Task.

Estimation of human attentional states using an electroencephalogram (EEG) has been demonstrated to help prevent human errors associated with the degradation. Since the use of the lambda response -one of eye-fixation-related potentials time-locked to the saccade offset- enables such estimation without external triggers, the measurements are compatible for an application in a real-world environment. With aiming to apply the lambda response as an index of human errors during the visual inspection, the current research elucidated whether the mean amplitude of the lambda response was a predictor of the number of inspection errors.

A longitudinal large-scale objective sleep data analysis revealed a seasonal sleep variation in the Japanese population.

In the contemporary era, when life habits are largely determined by social needs and individual preferences, sleep is nevertheless affected by seasonal environmental changes. Japan has large seasonal and geographical alterations of photoperiod and climate. Japan does not adopt the daylight saving time (DST) system, making it a suitable country for the study of seasonal variations in natural human sleep.

Monitoring of Weekly Sleep Pattern Variations at Home with a Contactless Biomotion Sensor.

Many people find that their sleep is restricted or disturbed by social obligations, including work. Sleep phase delays can affect an individual's circadian rhythms on the following day and cause daytime sleepiness and/or poor performance. In this study, to examine weekly variations in sleep patterns, we analyzed sleep data for seven-day periods (from Sunday to Saturday) that had been collected from 2914 subjects (aged 20-79 years) over a total of 24,899 subject-weeks using contactless biomotion sensors.

[Medical questionnaire, sleep diary, actigraphy].

Sleep disorders, including insomnia are common in older people. Since the sleep problems are generally subjective, intensive medical interviews using various sleep questionnaires are critical in the diagnosis and assessment. As an objective examination of sleep quality, an overnight polysomnography at a hospital is the gold standard, but sleep diary and actigraphy, which record sleep for a prolonged period at home, are useful to examine the sleep habit and sleep phase.