PSYCH 335 Lecture Notes - Lecture 5: Negative Feedback, Handicap Principle, Social Cost
Document Summary
Indicating there is a signaler and a receiver. Must be honest (reliable) most of the time; otherwise receivers would evolve to ignore dishonest signals. Cue: any feature of the world that can guide an animal"s future action. Can be inanimate (position of sun) or animate (location of a predator) Signals have to evolve for the purpose of affecting other"s behavior. Ex: injured fish bleed, sharks attracted to blood. Ex: female spiders choose males based on weight: heavier preferred, vibration of web to judge weight. Weight is a cue (not evolved for purpose of communication) , behavior of vibrating the web is a signal (evolved to communicate size) Sensory exploitation- preexisting sensory bias in the receiver is exploited by signaler ex: bias from another domain, novel traits, ancestral traits. Intention movements (behaviors that indicate what is coming next) ex: dogs retract lips before biting; bare teeth indicate bite is coming; bare teeth evolves into a signal of aggression--> ritualization.
