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Optimal behaviour can violate the principle of regularity
1Modelling Animal Decisions Group, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK. pete.trimmer@gmail.com
Proceedings. Biological Sciences
|June 7, 2013
Summary
Animals may appear irrational when making choices, but optimal strategies can explain these decisions. State-dependent behavior models show that violating regularity is sometimes adaptive, especially with non-persistent options.
Area of Science:
- Behavioral ecology
- Cognitive psychology
- Decision economics
Background:
- Understanding decision-making is central to behavioral ecology, psychology, and economics.
- Utility theory's regularity axiom posits stable preferences regardless of additional options.
- Empirical evidence shows animals violate regularity, often deemed irrational due to lack of theoretical explanation.
Purpose of the Study:
- To theoretically explain why animals violate the regularity axiom in decision-making.
- To demonstrate that choices violating regularity can be optimal under state-dependent behavior models.
- To investigate the influence of option persistence on the conditions for regularity violation.
Main Methods:
- Utilized state-dependent behavior models to simulate decision-making processes.
- Analyzed conditions under which optimal strategies lead to violations of the regularity axiom.
- Examined the impact of non-persistent options on the frequency and scope of regularity violations.
Main Results:
- Demonstrated that optimal behavioral strategies can lead to choices violating the regularity axiom.
- Identified that the conditions favoring regularity violations expand when options are not always persistent.
- Showed that even unchosen options can influence decisions, challenging standard utility theory.
Conclusions:
- Violations of the regularity axiom in animal choices can be theoretically explained as optimal, state-dependent behaviors.
- The dynamic nature of options (persistence) significantly impacts the likelihood of regularity violations.
- Standard utility theory, relying on axioms like regularity, may be insufficient to capture the complexity of real-world decision-making, particularly in ecological contexts.
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