[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100644589":3},{"organization":4,"outcomesModule":7,"designInfo":29,"detailedDescription":32,"studyPopulation":33,"armGroups":34,"interventions":39,"overallOfficials":28,"centralContacts":44,"locations":54,"responsibleParty":70,"collaborators":28,"id":74,"slug":28,"hasResults":75,"nctId":76,"briefTitle":77,"officialTitle":78,"acronym":28,"eligibilityCriteria":79,"healthyVolunteers":80,"sex":81,"minAge":82,"maxAge":83,"enrollmentInfo":84,"targetDuration":28,"studyType":87,"phases":28,"briefSummary":88,"conditions":89,"keywords":93,"overallStatus":102,"whyStopped":28,"lastUpdateSubmitDate":103,"lastUpdatePostDateStruct":104,"startDateStruct":107,"completionDateStruct":109,"leadSponsor":111,"locationsCount":112},{"fullName":5,"class":6},"The Hong Kong Polytechnic University","OTHER",{"primaryOutcomes":8,"secondaryOutcomes":16,"otherOutcomes":28},[9,13],{"measure":10,"description":11,"timeFrame":12},"Colour perception adjustment metrics","Colour perception will be measured using a computer-based colour adjustment task. Participants will adjust the appearance of a target object or stimulus, and outcome variables will include adjustment values in colour space, such as chromaticity, hue, saturation, or luminance-related measures, depending on the final task implementation. These measures will be used to characterise individual differences in colour perception.","During a single laboratory testing session",{"measure":14,"description":15,"timeFrame":12},"Binocular rivalry perception metrics","Binocular rivalry will be measured using a computer-based visual task in which different images or stimuli are presented separately to the two eyes. Outcome variables may include perceptual dominance duration, predominance, alternation rate, switch rate, or related behavioural responses. These measures will be used to characterise individual differences in binocular rivalry perception.",[17,20,24],{"measure":18,"description":19,"timeFrame":12},"Chronotype score","Chronotype will be assessed using a self-report questionnaire. The resulting score will be used to examine whether individual differences in colour perception and binocular rivalry are associated with morningness-eveningness preference.",{"measure":21,"description":22,"timeFrame":23},"Sleep-related measures","Sleep-related variables will be assessed using self-report questionnaire measures, such as recent sleep duration, sleep quality, or sleep timing. These measures will be used to examine whether sleep-related factors are associated with individual differences in colour perception and binocular rivalry.","Up to 7 days before or around the laboratory testing session",{"measure":25,"description":26,"timeFrame":27},"Subjective fatigue","Subjective fatigue will be assessed using self-report ratings, such as sleepiness or fatigue scales. These measures will be used to examine whether current fatigue or alertness is associated with colour perception and binocular rivalry measures.","Immediately before and after the visual perception tasks during a single laboratory testing session",null,{"allocation":28,"interventionModel":28,"interventionModelDescription":28,"primaryPurpose":28,"observationalModel":30,"timePerspective":31,"maskingInfo":28},"COHORT","CROSS_SECTIONAL","Colour perception and binocular rivalry both show variability across individuals. However, the extent to which these individual differences are stable and whether they are associated with personal or physiological factors remains unclear. This study will use behavioural visual perception tasks to measure individual differences in colour perception and binocular rivalry. Participants will complete a colour perception task and a binocular rivalry task, along with questionnaire measures related to chronotype, sleep, fatigue, and demographic characteristics including sex.\n\nThe primary aim is to determine whether measurable individual differences are present in colour perception and binocular rivalry performance. The secondary aim is to examine whether these differences are associated with chronotype, sex, sleep-related variables, and subjective fatigue. The study is observational and does not involve a clinical intervention, drug, biologic product, or medical device.","Healthy adult volunteers will be recruited from the university community and\u002For the surrounding community. Participants will complete computer-based colour perception and binocular rivalry tasks, together with self-report measures of chronotype, sleep, fatigue, and demographic characteristics.",[35],{"label":36,"type":28,"description":28,"interventionNames":37},"Healthy Adult Participants",[38],"Other: Computer-Based Visual Perception Tasks",[40],{"type":6,"name":41,"description":42,"armGroupLabels":43,"otherNames":28},"Computer-Based Visual Perception Tasks","Participants will complete computer-based visual perception tasks, including a colour perception task and a binocular rivalry task. These tasks are used to measure individual differences in perceptual responses and are not intended as a clinical intervention.",[36],[45,50],{"name":46,"role":47,"phone":48,"phoneExt":28,"email":49},"Cehao Yu, PhD","CONTACT","+852 3400 3012","cehao.yu@polyu.edu.hk",{"name":51,"role":47,"phone":52,"phoneExt":28,"email":53},"Junkai Che, Master","+852 9783 8643","junkai.che@connect.polyu.hk",[55],{"facility":56,"status":28,"city":57,"state":58,"zip":28,"country":59,"countryCode":60,"cosmosGeoPoint":61,"geoPoint":66,"contacts":67},"The Hong Kong Polytechnic University, Department of Applied Social Sciences","Hung Hom","Kowloon","Hong Kong","HK",{"type":62,"coordinates":63},"Point",[64,65],114.18532,22.30715,{"lat":65,"lon":64},[68,69],{"name":46,"role":47,"phone":48,"phoneExt":28,"email":49},{"name":51,"role":47,"phone":52,"phoneExt":28,"email":53},{"type":71,"investigatorFullName":72,"investigatorTitle":73,"investigatorAffiliation":5,"oldNameTitle":28,"oldOrganization":28},"PRINCIPAL_INVESTIGATOR","Dr YU Cehao","Research assistant professor","100644589",false,"NCT07671144","Visual Perception, Binocular Competition, and Fatigue-Related Individual Differences in Colour and Illumination Judgement","Characterising Individual Differences in Colour Perception and Binocular Rivalry and Their Associations With Chronotype, Sex, and Sleep","Inclusion Criteria:\n\n* Adults aged 18 years or older.\n* Normal or corrected-to-normal visual acuity.\n* Normal or corrected-to-normal binocular vision.\n* Normal colour vision, or no self-reported colour vision deficiency.\n* Able to understand the study instructions and provide informed consent.\n* Able to complete computer-based visual perception tasks and self-report questionnaires.\n\nExclusion Criteria:\n\n* Self-reported colour vision deficiency.\n* Uncorrected visual impairment or eye conditions that may interfere with visual perception tasks.\n* Strabismus, amblyopia, or other binocular vision problems that may interfere with binocular rivalry testing.\n* History of neurological disorders, photosensitive epilepsy, or severe sensitivity to flickering visual stimuli.\n* Current condition or medication that, in the investigator's judgment, may substantially affect visual perception, attention, or task performance.\n* Inability to complete the task procedures or provide valid responses.",true,"ALL","18 Years","25 Years",{"count":85,"type":86},128,"ESTIMATED","OBSERVATIONAL","This observational study aims to characterise individual differences in colour perception and binocular rivalry. Participants will complete computer-based visual perception tasks, including a colour perception task and a binocular rivalry task. The study will first examine whether individuals show measurable differences in these perceptual responses. It will then explore whether these differences are associated with chronotype, sex, sleep-related measures, and subjective fatigue. The findings may help clarify how stable individual characteristics and daily physiological states relate to visual perception.",[90,91,92],"Colour Perception","Color Perception","Binocular Rivalry",[94,95,96,97,98,99,25,100,101],"Colour perception","Color perception","Binocular rivalry","Individual differences","Chronotype","Sleep","Sex differences","Visual perception","NOT_YET_RECRUITING","2026-06-22",{"date":105,"type":106},"2026-06-26","ACTUAL",{"date":108,"type":86},"2026-07",{"date":110,"type":86},"2026-12",{"name":5,"class":6},1]