The power of nothing: Risk preference in pigeons, but not people, is driven primarily by avoidance of zero outcomes

Spetch, Marcia L.; Ludvig, Elliot A.; Madan, Christopher R.; Pisklak, Jeffrey M.; Pisklak, Jeffery M; Madan, Christopher R; Ludvig, Elliot A; Spetch, Marcia L

Abstract

Both human and non-human animals regularly need to make choices where the outcomes of their actions are unpredictable or probabilistic in some way. These are often termed “risky” choices. Faced with uncertain rewards, people (Homo sapiens) and pigeons (Columba livia) often show similar choice patterns. When the reward probabilities of risky choices are learned through experience, preferences in both species seem to be disproportionately influenced by the extreme (highest and lowest) outcomes in the decision context. Overweighting of these extremes increases preference for risky alternatives that lead to the highest outcome and decreases preference for risky alternatives that lead to the lowest outcome. In a series of studies, we systematically examine how this overweighting of extreme outcomes in risky choice generalizes across two evolutionary distant species: pigeons and humans. Both species showed risky choices consistent with an overweighting of extreme outcomes when the low-value risky option could yield an outcome of zero. When all outcome values were increased such that none of the options could lead to zero, people but not pigeons still overweighted the extremes. Unlike people, pigeons no longer avoided a low-value risky option when it yielded a non-zero food outcome. These results suggest that, despite some similarities, different mechanisms underlie risky choice in pigeons and people.

Citation

Spetch, M. L., Ludvig, E. A., Madan, C. R., Pisklak, J. M., Pisklak, J. M., Madan, C. R., …Spetch, M. L. (2019). The power of nothing: Risk preference in pigeons, but not people, is driven primarily by avoidance of zero outcomes. Journal of Experimental Psychology: Animal Learning and Cognition, 45(4), 431-445. https://doi.org/10.1037/xan0000217

• Journal Article Type: Article
• Acceptance Date: May 8, 2019
• Online Publication Date: Aug 15, 2019
• Publication Date: Aug 15, 2019
• Deposit Date: May 12, 2019
• Publicly Available Date: May 13, 2019
• Journal: Journal of Experimental Psychology: Animal Learning and Cognition
• Print ISSN: 2329-8456
• Electronic ISSN: 2329-8464
• Publisher: American Psychological Association
• Peer Reviewed: Peer Reviewed
• Volume: 45
• Issue: 4
• Pages: 431-445
• DOI: https://doi.org/10.1037/xan0000217
• Keywords: Experimental and Cognitive Psychology; Ecology, Evolution, Behavior and Systematics
• Public URL: https://nottingham-repository.worktribe.com/output/2041318
• Additional Information: ©American Psychological Association, 201.9 This paper is not the copy of record and may not exactly replicate the authoritative document published in the APA journal. Please do not copy or cite without author's permission. The final article is available, upon publication, at: http://dx.doi.org/10.1037/xan0000217