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Not yet recruiting NCT07671144

Visual Perception, Binocular Rivalry, and Fatigue-Related Individual Differences in Colour and Illumination Judgement

— Observational Colour Perception Color Perception Binocular Rivalry

For patients and families

In plain language

An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.

What is being studied
The protocol lists: Computer-Based Visual Perception Tasks.
Who it may be relevant to
Registry conditions: Colour Perception, Color Perception, Binocular Rivalry. Basic parameters: 18 years — 25 years · All.
What needs checking
Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
Where it takes place
Hong Kong
Next step
Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →

Unsure about the terms? Read our patient guide →

Official title

Characterising Individual Differences in Colour Perception and Binocular Rivalry and Their Associations With Chronotype, Sex, and Sleep

Overview

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.

Detailed description

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.

The 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.

Interventions

  • Other 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.

Primary outcome measures

  • Mean colour-adjustment values on the colour perception task [Time frame: Day 1 (single laboratory session)]
  • Mean perceptual dominance duration during binocular rivalry [Time frame: Day 1 (single laboratory session)]
  • Mean alternation rate during binocular rivalry [Time frame: Day 1 (single laboratory session)]
Secondary outcome measures (3)
  • Morningness-Eveningness Questionnaire (MEQ) score [Time frame: Day 1 (single laboratory session)]
  • Pittsburgh Sleep Quality Index (PSQI) global score [Time frame: Administered once, within 7 days before or at the single laboratory session (Day 1); the PSQI assesses sleep over the preceding 1 month.]
  • Karolinska Sleepiness Scale (KSS) score [Time frame: Day 1: assessed immediately before and immediately after the visual perception tasks, which are completed within a single session lasting up to approximately 1 hour.]

Eligibility criteria

Inclusion criteria

  • Adults aged 18 years or older.
  • Normal or corrected-to-normal visual acuity.
  • Normal or corrected-to-normal binocular vision.
  • Normal colour vision, or no self-reported colour vision deficiency.
  • Able to understand the study instructions and provide informed consent.
  • Able to complete computer-based visual perception tasks and self-report questionnaires.

Exclusion criteria

  • Self-reported colour vision deficiency.
  • Uncorrected visual impairment or eye conditions that may interfere with visual perception tasks.
  • Strabismus, amblyopia, or other binocular vision problems that may interfere with binocular rivalry testing.
  • History of neurological disorders, photosensitive epilepsy, or severe sensitivity to flickering visual stimuli.
  • Current condition or medication that, in the investigator's judgment, may substantially affect visual perception, attention, or task performance.
  • Inability to complete the task procedures or provide valid responses.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: Yes

Study design

Observational model
Cohort

Study locations

Hong Kong · 1 center
  • The Hong Kong Polytechnic University, Department of Applied Social Sciences — Hung Hom

Publications

  • Yang E, Blake R, McDonald JE 2nd. A new interocular suppression technique for measuring sensory eye dominance. Invest Ophthalmol Vis Sci. 2010 Jan;51(1):588-93. doi: 10.1167/iovs.08-3076. Epub 2009 Jul 23. PMID 19628736
  • Webster MA, Miyahara E, Malkoc G, Raker VE. Variations in normal color vision. II. Unique hues. J Opt Soc Am A Opt Image Sci Vis. 2000 Sep;17(9):1545-55. doi: 10.1364/josaa.17.001545. PMID 10975364
  • Foster DH. Color constancy. Vision Res. 2011 Apr 13;51(7):674-700. doi: 10.1016/j.visres.2010.09.006. Epub 2010 Sep 16. PMID 20849875
  • Wallisch P. Illumination assumptions account for individual differences in the perceptual interpretation of a profoundly ambiguous stimulus in the color domain: "The dress". J Vis. 2017 Apr 1;17(4):5. doi: 10.1167/17.4.5. PMID 28388701
  • Gegenfurtner KR, Bloj M, Toscani M. The many colours of 'the dress'. Curr Biol. 2015 Jun 29;25(13):R543-4. doi: 10.1016/j.cub.2015.04.043. Epub 2015 May 14. PMID 25981790
  • Lafer-Sousa R, Hermann KL, Conway BR. Striking individual differences in color perception uncovered by 'the dress' photograph. Curr Biol. 2015 Jun 29;25(13):R545-6. doi: 10.1016/j.cub.2015.04.053. Epub 2015 May 14. PMID 25981795
  • Toscani M, Gegenfurtner KR, Doerschner K. Differences in illumination estimation in #thedress. J Vis. 2017 Jan 1;17(1):22. doi: 10.1167/17.1.22. PMID 28141875

Identifiers

NCT: NCT07671144 · HSEARS20260621001 · HSEARS20260621001

Primary sources (government registries)

View this study on ClinicalTrials.gov ↗