Browsing by Subject "Clock time estimation"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Publication
    Open Access
    Living without temporal cues: a case study
    (Frontiers Media, 2020-02-07) Revell, Victoria L.; Cook, Tom J.; Welch, Thomas R. E.; Rol, Maria-Angeles; Skene, Debra J.; Madrid, Juan Antonio; Bonmatí Carrión, María de los Ángeles; Anatomía Humana y Psicobiología
    Isolation from external time cues allows endogenous circadian rhythmicity to be demonstrated. In this study, also filmed as a television documentary, we assessed rhythmic changes in a healthy man time isolated in a bunker for 9 days/nights. During this period the lighting conditions were varied between: (1) self-selected light/dark cycle, (2) constant dim light, and (3) light/dark cycle with early wake up. A range of variables was assessed and related to the sleep-wake cycle, psychomotor and physical performance and clock-time estimation. This case study using modern non-invasive monitoring techniques emphasizes how different physiological circadian rhythms persist in temporal isolation under constant dim light conditions with different waveforms, free-running with a period (τ) between 24 and 25 h. In addition, a significant correlation between time estimation and mid-sleep time, a proxy for circadian phase, was demonstrated.