O023 Circadian Photoreception Influences Loss Aversion

Abstract Introduction Gambling behaviour is a growing societal problem. While previous work has explored how sound encourages gambling, an unexplored element that may play a role is the impact of circadian photoreception on cognitive processes underlying this behaviour. This study investigated the influence of circadian photoreception on loss aversion in gambling by altering the blue content of light while maintaining the same visual brightness (200 lux). Methods Fifteen participants (5 male, M = 20.40, SD = 2.03) completed an economic decision-making task under blue-enriched and blue-depleted light on separate occasions. The task required participants to choose between a risky gamble of positive or negative value or a less risky guaranteed outcome. Hierarchical Bayesian Modelling derived individual parameter estimates for loss aversion and trial-by-trial performance was analysed using linear mixed models. Results Light condition significantly influenced loss aversion, with blue-enriched light associated with a.63 decrease in loss aversion (p <.01). Significant sex differences were also found, with women displaying greater loss aversion across both light conditions. Conclusions This study presents evidence that light that preferentially targets circadian photoreception reduces loss aversion and suggests that reducing the blue light content in gambling scenarios may be a promising target for reducing gambling behaviour.