[Study of Equilibrium Control System during a Lowering at Arousal Level]

Area of Science:

• Neuroscience
• Sleep Science
• Human Physiology

Background:

• Contingent Negative Variation (CNV) is an event-related potential linked to vigilance.
• CNV amplitude decreases with reduced vigilance, disappearing below a certain threshold.
• Sleep deprivation is known to decrease vigilance, impacting event-related potentials.

Purpose of the Study:

• To investigate the impact of 36-hour sleep deprivation on the biocontrol system.
• To examine changes in equilibrium function and vigilance during prolonged sleep deprivation.
• To explore the relationship between sleep deprivation, CNV, and the equilibrium control system.

Main Methods:

• Utilized 36-hour sleep deprivation in human subjects.
• Recorded Flicker Values (FV), Stanford Sleepiness Scale (SSS) scores, and stabilograms every 90 minutes.
• Monitored physiological parameters for 52 hours, including a 12-hour sleep recovery period.

Main Results:

• Vigilance, measured by FV and SSS, significantly decreased around 22.5 hours of sleep deprivation, correlating with CNV disappearance.
• The greatest sway value (eyes closed) occurred at 22.5 hours.
• Equilibrium function and vigilance showed no significant recovery after 12 hours of sleep post-deprivation.

Conclusions:

• Evidence supports the disappearance of CNV after 36 hours of sleep deprivation.
• The equilibrium control system operates differently without CNV during prolonged sleep deprivation.
• Subconscious biocontrol processes may continue even after awakening from recovery sleep.