Publication: Living without temporal cues: a case study
Authors
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
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Publisher
Frontiers Media
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DOI
https://doi.org/10.3389/fphys.2020.00011
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info:eu-repo/semantics/article
Description
© 2020 Bonmati-Carrion, Revell, Cook, Welch, Rol, Skene and Madrid.
This manuscript version is made available under the CC-BY 4.0 license http://creativecommons.org/licenses/by/4.0/
This document is the Published Manuscript, version of a Published Work that appeared in final form in Frontiers in Psychology. To access the final edited and published work see https://doi.org/10.3389/fphys.2020.00011
Abstract
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.
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Citation
Frontiers in Psychology, 2020, Vol. 11 : 11
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