[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100644966":3},{"organization":4,"armGroups":7,"interventions":19,"overallOfficials":25,"centralContacts":30,"locations":36,"responsibleParty":54,"collaborators":25,"id":57,"slug":58,"hasResults":59,"nctId":60,"briefTitle":61,"officialTitle":62,"acronym":25,"eligibilityCriteria":63,"healthyVolunteers":64,"sex":65,"minAge":66,"maxAge":67,"enrollmentInfo":68,"targetDuration":25,"studyType":71,"phases":72,"briefSummary":74,"conditions":75,"keywords":80,"overallStatus":39,"whyStopped":25,"lastUpdateSubmitDate":91,"lastUpdatePostDateStruct":92,"startDateStruct":95,"completionDateStruct":97,"leadSponsor":99,"locationsCount":100},{"fullName":5,"class":6},"The Hong Kong Polytechnic University","OTHER",[8,15],{"label":9,"type":10,"description":11,"interventionNames":12},"Morning-first sequence","EXPERIMENTAL","Participants complete the Morning test session (about 08:00) first, then the Evening test session (about 22:00). Both sessions use the identical perception and cognition battery; session order is counterbalanced across participants.",[13,14],"Behavioral: Morning test session (about 08:00)","Behavioral: Evening test session (about 22:00)",{"label":16,"type":10,"description":17,"interventionNames":18},"Evening-first sequence","Participants complete the Evening test session (about 22:00) first, then the Morning test session (about 08:00). Both sessions use the identical perception and cognition battery; session order is counterbalanced across participants.",[13,14],[20,26],{"type":21,"name":22,"description":23,"armGroupLabels":24,"otherNames":25},"BEHAVIORAL","Morning test session (about 08:00)","Full perception and cognition battery administered shortly after habitual wake (about 08:00): time-perception tasks (interval production\u002Festimation, duration discrimination, passage-of-time judgement), state measures (sleepiness, mood, arousal), colour tasks, a perceptual conformity task, and a vigilance task.",[16,9],null,{"type":21,"name":27,"description":28,"armGroupLabels":29,"otherNames":25},"Evening test session (about 22:00)","The identical battery administered late in the evening (about 22:00), enabling within-participant comparison of the same measures at the two times of day.",[16,9],[31],{"name":32,"role":33,"phone":34,"phoneExt":25,"email":35},"Cehao Yu, PhD","CONTACT","+852 61570422","cehao.yu@polyu.edu.hk",[37],{"facility":38,"status":39,"city":40,"state":25,"zip":25,"country":40,"countryCode":41,"cosmosGeoPoint":42,"geoPoint":47,"contacts":48},"Child Development Centre","RECRUITING","Hong Kong","HK",{"type":43,"coordinates":44},"Point",[45,46],114.17469,22.27832,{"lat":46,"lon":45},[49,50,52],{"name":32,"role":33,"phone":34,"phoneExt":25,"email":35},{"name":25,"role":33,"phone":25,"phoneExt":25,"email":51},"cehao.yu.23@gmail.com",{"name":32,"role":53,"phone":25,"phoneExt":25,"email":25},"PRINCIPAL_INVESTIGATOR",{"type":53,"investigatorFullName":55,"investigatorTitle":56,"investigatorAffiliation":5,"oldNameTitle":25,"oldOrganization":25},"Dr YU Cehao","Research Assistant Professor","100644966","chronotype-alignment-and-time-perception-100644966",false,"NCT07677111","Chronotype Alignment and Time Perception","Circadian Match and Mismatch Effects on Temporal Cognition in Morning- and Evening-Type Adults","Inclusion Criteria:\n\n* Healthy adult, 18-40 years\n* 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)\n* Normal or corrected-to-normal visual acuity\n* Normal colour vision (e.g. Ishihara screening)\n* Fluent in the testing-site language (Danish, Chinese, or English)\n* Able to attend both an early-morning (about 08:00) and a late-evening (about 22:00) session\n\nExclusion Criteria:\n\n* Intermediate chronotype (MEQ in the middle band)\n* 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)\n* Diagnosed sleep disorder (e.g. insomnia, sleep apnoea)\n* Current psychiatric or neurological disorder\n* Use of sleep medication or psychoactive or CNS-active drugs\n* Colour-vision deficiency\n* Substance-use disorder",true,"ALL","18 Years","55 Years",{"count":69,"type":70},240,"ESTIMATED","INTERVENTIONAL",[73],"NA","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.\n\nHealthy 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\").\n\nSecondary 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\u002Fmismatch effects on temporal cognition generalise across populations.",[76,77,78,79],"Chronotype","Circadian Rhythm","Sleep","Time Perception",[81,82,83,84,85,86,87,88,89,90],"chronotype","morningness-eveningness","synchrony effect","time perception","temporal cognition","circadian rhythm","time-of-day","duration discrimination","arousal","cross-cultural","2026-06-29",{"date":93,"type":94},"2026-06-30","ACTUAL",{"date":96,"type":94},"2025-09-01",{"date":98,"type":70},"2028-06-30",{"name":5,"class":6},1]