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Chronotype Alignment and Time Perception

RecruitingNAAges 18 Years - 55 YearsAllThe Hong Kong Polytechnic University
NCT07677111 on ClinicalTrials.gov ↗
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In plain words

What the trial is, and whether it could suit you

People differ in chronotype - whether they function best in the morning ("larks") or the evening ("owls"). This study asks whether the match or mismatch between a person's chronotype and the time of day at which they are tested changes how they perceive time. Healthy morning-type and evening-type adults at three sites (Aarhus, Denmark; Changzhou, China; and Hong Kong) complete the same battery of perception and cognition tasks twice - once in the early morning (about 08:00) and once late in the evening (about 22:00), in counterbalanced order. The primary outcome is the accuracy (signed bias) of time-perception judgements; the key comparison is the interaction between chronotype and time of day (the "synchrony effect"). Secondary measures include timing precision, the subjective passage of time, sleepiness, mood, colour perception (with and without blue-blocking glasses) and perceptual

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📋 Eligibility rules (as published)
Inclusion Criteria: * Healthy adult, 18-40 years * Clear morning-type or evening-type on the Morningness-Eveningness Questionnaire (MEQ-SA); intermediate types excluded (state exact cut-offs, e.g. evening-type 41 or below, morning-type 59 or above) * Normal or corrected-to-normal visual acuity * Normal colour vision (e.g. Ishihara screening) * Fluent in the testing-site language (Danish, Chinese, or English) * Able to attend both an early-morning (about 08:00) and a late-evening (about 22:00) session Exclusion Criteria: * Intermediate chronotype (MEQ in the middle band) * Night or rotating shift work in the past 3 months, or recent trans-meridian travel (more than 2 time zones in the past 4 weeks) * Diagnosed sleep disorder (e.g. insomnia, sleep apnoea) * Current psychiatric or neurological disorder * Use of sleep medication or psychoactive or CNS-active drugs * Colour-vision deficiency * Substance-use disorder
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What it tests

  • Morning test session (about 08:00)
  • Evening test session (about 22:00)
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Where

1 site
Child Development Centre
Hong Kong, Hong Kong
🤝 Taking part is your choice, and you can leave at any time. Only the trial team can confirm you are eligible — always decide together with your own doctor.
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