Abstract

Having a satisfactory definition of behavioural deception is important for understanding several types of evolutionary questions. No definition offered in the literature so far is adequate on all fronts. After identifying characteristics that are important for a definition, a new definition of behavioural deception is offered. The new definition, like some other proposed attempts, relies on formal game-theoretic models of signalling. Unlike others, it incorporates explicit consideration of the population in which the potentially deceptive interactions occur. The general structure of the definition satisfies many of the characteristics that were problematic for other definitions, and others are satisfied by explicitly incorporating information about the population in which interactions occur. Examples are given for chick begging in the Sir Philip Sidney game and other situations. 1 Introduction2 Deception in Formal Models2.1 Formal models of signalling2.2 Deception as dishonesty2.3 Deception as negative value of information2.4 Deception as misinformation with payoff conditions3 A Revised Definition3.1 Technical definitions3.2 Begging behaviour and the Sir Philip Sidney game3.3 ‘Universal’ deception and a possible objection3.4 One-on-one interactions3.5 Lucky errors4 Discussion and Conclusions.