NCT07677111 Chronotype Alignment and Time Perception
| NCT ID | NCT07677111 |
| Status | Recruiting |
| Phase | — |
| Sponsor | The Hong Kong Polytechnic University |
| Condition | Chronotype |
| Study Type | INTERVENTIONAL |
| Enrollment | 240 participants |
| Start Date | 2025-09-01 |
| Primary Completion | 2028-06-30 |
Eligibility & Interventions
Eligibility Fast-Check
Enter your details for a quick preliminary check. This does not replace medical advice.
What to Expect as a Participant
You will actively receive the study intervention — which may be a drug, biologic, device, or procedure.
This trial targets 240 participants in total. It began in 2025-09-01 with a primary completion date of 2028-06-30.
⚠ This information is for research awareness only. Always consult your physician before joining any clinical trial. Participation is voluntary and you may withdraw at any time.
Brief Summary
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 decision-making. By testing the same protocol across three cultures and latitudes, the study examines whether circadian match/mismatch effects on temporal cognition generalise across populations.
Eligibility Criteria
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
Contact & Investigator
Frequently Asked Questions
Who can join the NCT07677111 clinical trial?
This trial is open to participants of all sexes, aged 18 Years or older, up to 55 Years, studying Chronotype. Full inclusion and exclusion criteria are listed in the Eligibility Criteria section. Always confirm your eligibility with the research team before applying.
Is NCT07677111 currently recruiting?
Yes, NCT07677111 is actively recruiting participants. Contact the research team at cehao.yu@polyu.edu.hk for enrollment information.
Where is the NCT07677111 trial being conducted?
This trial is being conducted at Hong Kong, Hong Kong.
Who is sponsoring the NCT07677111 clinical trial?
NCT07677111 is sponsored by The Hong Kong Polytechnic University. The trial plans to enroll 240 participants.