title: Does reward unpredictability reflect risk?
abstract: Most decisions made in real-life situations are risky because they are associated with possible negative consequences. Current models of decision-making postulate that the occasional, unpredictable absence of reward that may result from free choice is a negative consequence interpreted as risk by organisms in laboratory situations. I argue that such a view is difficult to justify because, in most experimental paradigms, reward omission does not represent a cost for the decision-maker. Risk only exists when unpredictability may cause a potential loss of own limited resources, whether energetic, social, financial, and so on. Thus, the experimental methodologies used to test humans and non-humans relative to risk-taking seem to be limited to studying the effects of reward uncertainty in the absence of true decision cost. This may have important implications for the conclusions that can be drawn with respect to the neurobehavioural determinants of risk-taking in real-life situations.
authors.affiliation: Département de Psychologie, Cognition et Comportement, Université de Liège, 5 Boulevard du Rectorat (B 32), B4000 Liège, Belgium. Electronic address: panselme@ulg.ac.be.
authors.forename: Patrick
authors.initials: P
authors.lastname: Anselme
mesh_terms: D000818:Animals; D005075:Biological Evolution; D001921:Brain / Q000502:physiology; D003657:Decision Making / Q000502:physiology; D004298:Dopamine / Q000378:metabolism; D006801:Humans; D012201:Reward; D012306:Risk; D035501:Uncertainty
chemical_list: D004298:Dopamine
keywords: Dopamine; Limited resources; Opportunity cost; Risk; Unpredictability