Electroencephalogram‐sleep study

Abstract

The study of sleep, and in particular electroencephalogram (EEG)-sleep recordings, is important in several areas of medicine. Next to pain, sleep anomalies are the most significant indicators of illness. During sleep the human brain goes through several physiological stages; therefore, the problem of automated detection of sleep stages using EEG data naturally arises in neurosciences. A two step procedure of computerized scoring of sleep stages is considered, with the first step involving features extractions via spectral and nonlinear dynamics characteristics and the second step in which sleep classifications can be accomplished.

Application of the ϵ-Complexity of a continuous function to Study Sleep in Mice

“…Due to the connections between sleep and other neurological and physiological processes, systems, and health outcomes many researchers will fnd a need to incorporate sleep information in the form of sleep stage scoring into their research ( [2], [13]). The long-accepted process of sleep stage scoring has relied on the visual analysis by at least one expert of EEGs in combination with electromyograms (EMGs), which measure muscle activity ( [23]). Researchers fnd that EMGs help to diferentiate between Wake and REM since EEGs do not provide enough evidence on their own ( [20]).…”

“…A common tool for analyzing EEG signals for the purpose of sleep scoring is spectral analysis, which is a method of decomposing the signal into frequency components ( [23], [29]). Spectral analysis refers to the process of decomposition of a complex time series signal CHAPTER 1.…”

“…The area in blue marks the absolute delta power defning the frequency range as 0.5-4Hz. density of frequency bands ( [20], [21], [22], [23], [28], [31]) by creating a smoothed periodogram. A periodogram provides an estimate of the density or power of each frequency band making up the EEG signal in an epoch (please see fgure 1.2).…”

“…However, an EEG signal is highly non-stationary; segmentation allows for this requirement to be fulflled ( [4], [10], [24]). If a short enough epoch is chosen, then the signal can be called "piece-wise stationary" ( [4], [23]).…”