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Related Experiment Video

Updated: Mar 2, 2026

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

Published on: April 7, 2020

Performance awareness: Predicting cognitive performance during simulated shiftwork using chronobiological measures.

Drew M Morris¹, June J Pilcher¹, Joseph B Mulvihill¹

¹Department of Psychology, Clemson University, Clemson, SC, USA.

Applied Ergonomics

|May 16, 2017

Summary

This summary is machine-generated.

Circadian rhythms, measured by oral temperature, predict awareness of cognitive performance during night shifts. This understanding can enhance occupational safety by mitigating risks associated with shiftwork.

Keywords:

Body temperature Circadian rhythm Occupational health

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Published on: June 18, 2014

Area of Science:

Chronobiology
Occupational Health
Cognitive Performance

Background:

Shiftwork and sleep deprivation commonly impair cognitive performance.
Understanding the interplay between circadian rhythms and performance awareness is crucial for occupational safety.
Existing methods for assessing performance awareness may not fully capture physiological influences.

Purpose of the Study:

To investigate physiological tracers of circadian rhythms as predictors of cognitive performance.
To examine the relationship between circadian rhythms and performance awareness under simulated shiftwork conditions.
To determine if oral temperature and heart rate predict cognitive performance and awareness during sleep deprivation.

Main Methods:

Two studies involving sleep-deprived participants (n=33 for nightshift, n=32 for dayshift) completing simulated shifts.
Cognitive performance assessed using a standardized logic test.
Circadian rhythm indices (body temperature, heart rate) and performance awareness (actual vs. perceived performance correlation) were measured.

Main Results:

A parallelism was observed between performance awareness and circadian rhythm.
Chronobiological changes predicted performance awareness during simulated nightshifts but not dayshifts.
Oral temperature was a significant independent predictor, outperforming subjective awareness in predicting an individual's awareness of their own performance.

Conclusions:

Physiological markers of circadian rhythms, particularly oral temperature, are valuable predictors of cognitive performance awareness.
Integrating circadian rhythm monitoring into applied ergonomics may reduce occupational risks linked to impaired performance awareness.
Oral temperature provides a more objective measure of performance awareness than subjective self-assessment in shiftwork contexts.