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.
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.
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.