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

14. september 2026 oppdatert av: Dr YU Cehao, The Hong Kong Polytechnic University

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

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.

Studieoversikt

Status

Rekruttering

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

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.

Studietype

Observasjonsmessig

Registrering (Antatt)

128

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studer Kontakt Backup

Studiesteder

  • Hong Kong
    • Hung Hom
      • Kowloon, Hung Hom, Hong Kong
        • Rekruttering
        • Child Development Centre
        • Ta kontakt med:
        • Hovedetterforsker:
          • Cehao Yu, PhD
    • Kowloon
      • Hung Hom, Kowloon, Hong Kong
        • Har ikke rekruttert ennå
        • The Hong Kong Polytechnic University, Department of Applied Social Sciences
        • Ta kontakt med:
        • Ta kontakt med:

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

  • Voksen

Tar imot friske frivillige

Ja

Prøvetakingsmetode

Ikke-sannsynlighetsprøve

Studiepopulasjon

Healthy adult volunteers will be recruited from the university community and/or 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.

Beskrivelse

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.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

Kohorter og intervensjoner

Gruppe / Kohort
Intervensjon / Behandling
Healthy Adult Participants
Healthy adult volunteers aged 18 to 25 years with normal or corrected-to-normal visual acuity and normal colour vision, recruited from the university and surrounding community. In a single laboratory session, participants complete computer-based colour perception and binocular rivalry tasks and self-report questionnaires on chronotype, sleep, fatigue, and demographic characteristics.
Annen: 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.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Mean colour-adjustment values on the colour perception task
Tidsramme: Day 1 (single laboratory session)
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.
Day 1 (single laboratory session)
Mean perceptual dominance duration during binocular rivalry
Tidsramme: Day 1 (single laboratory session)
Binocular rivalry is measured with a computer-based dichoptic task in which a different image is presented to each eye. Perceptual dominance duration is the mean length of time, in seconds, that one stimulus remains exclusively visible before perception switches to the other. Longer mean durations indicate more stable, slower-switching rivalry.
Day 1 (single laboratory session)
Mean alternation rate during binocular rivalry
Tidsramme: Day 1 (single laboratory session)
Binocular rivalry is measured with the same computer-based dichoptic task. Alternation rate is the mean number of perceptual switches between the two stimuli per minute of viewing. Higher alternation rates indicate faster perceptual switching between the two eyes' images.
Day 1 (single laboratory session)

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Morningness-Eveningness Questionnaire (MEQ) score
Tidsramme: Day 1 (single laboratory session)
Chronotype assessed using the Morningness-Eveningness Questionnaire (MEQ). Total scores range from 16 to 86; higher scores indicate greater morningness (a stronger morning-type preference) and lower scores indicate greater eveningness.
Day 1 (single laboratory session)
Pittsburgh Sleep Quality Index (PSQI) global score
Tidsramme: Administered once, within 7 days before or at the single laboratory session (Day 1); the PSQI assesses sleep over the preceding 1 month.
Sleep quality assessed using the Pittsburgh Sleep Quality Index (PSQI). The global score is the sum of seven component scores and ranges from 0 to 21; higher scores indicate worse sleep quality (a global score above 5 indicates poor sleep quality).
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
Tidsramme: 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.
Subjective sleepiness/fatigue assessed using the Karolinska Sleepiness Scale (KSS), a single-item 9-point scale. Scores range from 1 to 9; higher scores indicate greater sleepiness. The pre-task to post-task change in KSS score may also be reported.
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.

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

The Hong Kong Polytechnic University

Etterforskere

  • Hovedetterforsker: Cehao Yu, PhD, The Hong Kong Polytechnic University

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

1. juli 2026

Primær fullføring (Antatt)

30. desember 2026

Studiet fullført (Antatt)

30. desember 2026

Datoer for studieregistrering

Først innsendt

22. juni 2026

Først innsendt som oppfylte QC-kriteriene

22. juni 2026

Først lagt ut (Faktiske)

26. juni 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

15. september 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

14. september 2026

Sist bekreftet

1. juni 2026

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Andre studie-ID-numre

  • HSEARS20260621001 (Annen identifikator: The Hong Kong Polytechnic University)

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Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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