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Menstrual cycles are influenced by sunshine
Introduction. The study determined the effect of seasons and meteorological variables on ovarian-menstrual function. Methods. Women (N = 129) living in Novosibirsk (55°N), Russia, provided data onExpand
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Biofeedback in optimizing psychomotor reactivity: II. The dynamics of segmental α-activity characteristics
To estimate the EEG predictors of successful training in the voluntary control of psychomotor reactivity, 29 healthy young (aged 22.3 ± 1.5 years) musical performers were examined. The estimation wasExpand
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The hockey-stick method to estimate evening dim light melatonin onset (DLMO) in humans
The onset of melatonin secretion in the evening is the most reliable and most widely used index of circadian timing in humans. Saliva (or plasma) is usually sampled every 0.5–1 hours under dim-lightExpand
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Quantification of Sleepiness Through Principal Component Analysis of the Electroencephalographic Spectrum
Although circadian and sleep research has made extraordinary progress in the recent years, one remaining challenge is the objective quantification of sleepiness in individuals suffering from sleepExpand
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How many diurnal types are there? A search for two further “bird species”
Abstract Morning and evening types (“larks” and “owls”) are most alert in the morning and in the evening, respectively. Because they are also characterized by preference for early awakening–earlyExpand
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The first and second principal components of the EEG spectrum as the correlates of sleepiness
PurposeQuantitative EEG measurement of sleepiness must be regarded both as fundamentally and practically important. In a search for the markers of physiological sleepiness, we tested whether the timeExpand
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Structuring the inter-individual variation in waking EEG can help to discriminate between the objective markers of sleep debt and sleep pressure
Question of the studyOur aim was to assess the inter-individual link between the principal component structure of the waking EEG and the response of the parameters of sleep-wake regulation to sleepExpand
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Generalizability of Frequency Weighting Curve for Extraction of Spectral Drowsy Component From the EEG Signals Recorded in Eyes-Closed Condition
One of the critical barriers to reducing the threats of sleep loss to public health, safety, and productivity is a lack of practical tools for quick identification of objective level of sleepiness.Expand
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Phase Difference Between Chronotypes in Self-Reported Maximum of Alertness Rhythm
An objective physiological predictor of self-reported chronotypological differences in circadian timing of alertness peak (> 5 hr) has not been yet identified. Our goals were to establish externalExpand
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Associations of waking EEG structure with chronotype and trototype of 130 sleep deprived individuals
We explored the relationship between inter-individual variation in waking EEG spectra and trait-like variation in sleep–wake adaptability. Resting EEG was recorded every three hours (nine times) inExpand
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