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today ab march 27th - Communication the process by which...

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Communicati on Sender Receiver signa l the process by which senders use specially designed signals or displays to modify the behavior of receivers (message) (meaning) (channel) 4 components Sender Receive r Channel Signal
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Communicati on Honest Communication – “true” signal – raises the fitness of both sender and receiver e.g. warning coloration, baring teeth, mating displays Dishonest Communication – “untrue” signal – lowers the fitness of either sender or receiver e.g. eavesdropping, deceit 2 main types
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1.“forced honesty” – deceit is impossible Physical constraints on deceit deceit physically impossible direct material link between signal and some underlying aspect of the sender’s state or condition Strategic constraints on deceit ‘handicap principle’: signal is costly, only superior individuals gain net benefit from high signal values general handicap= variation in benefits quality handicap= variation in costs Types of Signals
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Color in grosbeaks is an honest signal of quality via their color- forced honesty because they cannot control their color Forced Honesty
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major histocompatibility complex (MHC) Physical constraints on deceit Highly polymorphic genes Control immunological self/non-self recognition More diverse = stronger immune system Females of some species seek males based on the MHC genotype Females prefer to mate with males with dissimilar MHC haplotypes (set of genes that are inherited together) Notes: female mice can detect the MHC of males. (like the psychology today article on birth control) in order to maximize the immune function of their offspring
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House mice (Mus domesticus) MHC similar MHC dissimilar 21/30 70% 9/30 30% P < 0.05 MHC and mate choice
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Wedekind et al., 1995 Males slept in t shirts for three days, then females smelled the shirts and rated them based on scent pleasantness
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Pleasantness of male odor mor e les s MHC dissimilar MHC similar 6 4 2 * P < 0.05 Women like the smell of men with different MHC
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mor e les s MHC dissimilar MHC similar 6 4 2 P < 0.05 Pleasantness of male odor *
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In both mice and humans, females choose males with different MHCs MHC is communicated by sender (male) through chemical channel (odors) to receiver (female) such that mate choice is directed by MHC composition This choice depends on the female’s hormonal condition Honest signal of fitness- maximize immune system of offspring and avoids interbreeding
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2. Unforced honesty- fitness interests of sender and receiver coincide sender is honest no problem for receiver because receiver benefits Waggle dance in honeybees Types of Signals
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Unforced Honesty recruitment calls of non-resident ravens When a raven finds a elk for example they call others to the scene A raven intrudes on a territory, calls to recruit other non-residents to food Fitness of initial raven increases with the arrival of other intruders (otherwise
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This note was uploaded on 04/06/2008 for the course PSYC 2420 taught by Professor Wolley during the Spring '08 term at Columbia.

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today ab march 27th - Communication the process by which...

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