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A Behavioral and Electrophysiological Assessment of Activity States Defined by Using the Static Charge Sensitive Bed (SCSB) Method
Jukka Kaartinen Ph.D, Olli Polo M.D, Mikael Sallinen Ph.D, Heikki Lyytinen Ph.D
Activity states based on static charge sensitive bed (SCSB) recording were assessed as
indicators of sleep depth. Twelve subjects' instructed responses to auditory stimuli were
studied in relation to the sleep stages and to three categories of SCSB activity, quiet (QS),
intermediate (IS), and active state (AS), which were automatically defined according to the
variability of motor, respiratory, and cardiac parameters. The differences in responsiveness
during sleep stages were consistent with earlier findings. The response rates (without
polygraphic signs of awakening) were as follows: stage 1, 52.8%; stage 2, 11.0%; stage
REM, 8.5%; slow wave sleep, 0.5%. The lacking of responses in wakefulness occurred
mostly during trials after the initial sleep onset. In the SCSD data responsiveness was lowest
in QS and highest in AS. After the first hour in bed the response rates were 3.9% in QS,
13.3% in IS, and 30.3 % during AS (for most subjects even lower in QS and IS). QS seems
to reflect a behaviorally deep sleep and IS and AS appear as lighter states respectively. The
results suggest that the SCSB activity states are useful measures of sleep quality, QS providing
an approximate estimate of deep sleep. (Sleep and Hypnosis 2003;5(3):136-144)
Key words: static charge sensitive bed (SCSB), behavioral responses, depth of sleep,
sleep stages
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