Summary:The purpose of the current study was to assess the overlap in variance of two procedures for the quantification of sleep electrophysiology: conventional stage scoring and computer quantification of tonic activity. Data were collected on 24 nights from eight subjects and were scored according to a modified set of Rechtschaffen and Kales criteria and submitted to a period-analytic computer analysis. Following this, discriminant function analyses were performed on the data for each night to predict the visual stage scores from the computer-generated data. The results indicate a very high degree of predictive accuracy (91.05%) supporting the contention that the computer-quantified data set includes the variance normally captured by stage scoring. The implications of computer quantification of sleep electrophysiology are discussed. Key Words: Sleep stagesPeriod analysis-Electroencephalography-Psychophysiology.Traditional methodologies used for the study of sleep electrophysiology and psychophysiology have principally concerned the reduction of data to stages so that the vast amounts of data collected can be reduced to a point where statistical comparisons between nights and/or subjects can be made. Historically these quantification procedures have relied on visual examination of the data and have thus emphasized easily observable visual events such as spindles, K-complexes, electromyographic (EMG) reduction, and electroencephalographic (EEG) desynchronization (1). However, recent advances in computer technology and application have suggested new ways in which such data sets can be evaluated. One direction this work has followed has been the development of machinery to automate the stage scoring process or to detect relevant phasic events (2)(3)(4)(5)(6)(7)(8).A different approach uses computers to quantify the electrophysiological data to explore psychophysiological variations within stage as well as comparing different nights or subjects using techniques other than stage scoring (9)(10)(11)(12)(13)(14)(15). In some cases these later endeavors do not directly quantify phasic events but rather include them in evaluations of tonic activity.
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