The importance of gestural communication: a study of human–dog communication using incongruent information
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We assessed how water rescue dogs, which were equally accustomed to respond to gestural and verbal requests, weighted gestural versus verbal information when asked by their owner to perform an action. Dogs were asked to perform four different actions (“sit”, “lie down”, “stay”, “come”) providing them with a single source of information (in Phase 1, gestural, and in Phase 2, verbal) or with incongruent information (in Phase 3, gestural and verbal commands referred to two different actions). In Phases 1 and 2, we recorded the frequency of correct responses as 0 or 1, whereas in Phase 3, we computed a ‘preference index’ (percentage of gestural commands followed over the total commands responded). Results showed that dogs followed gestures significantly better than words when these two types of information were used separately. Females were more likely to respond to gestural than verbal commands and males responded to verbal commands significantly better than females. In the incongruent condition, when gestures and words simultaneously indicated two different actions, the dogs overall preferred to execute the action required by the gesture rather than that required verbally, except when the verbal command “come” was paired with the gestural command “stay” with the owner moving away from the dog. Our data suggest that in dogs accustomed to respond to both gestural and verbal requests, gestures are more salient than words. However, dogs’ responses appeared to be dependent also on the contextual situation: dogs’ motivation to maintain proximity with an owner who was moving away could have led them to make the more ‘convenient’ choices between the two incongruent instructions.
KeywordsHuman–dog communication Incongruent information Gestural cue Verbal cue Water rescue dog
The authors would like to thank Roberto Gasbarri, president of the Italian School of Water Rescue Dogs for enthusiastically allowing the test with its water rescue dyads and all the handlers that have become available for testing. Special thanks also to Dr. Marina Pompameo, director of veterinary ASL, Dr. Giuseppe Gargiulo, director of ASL, and Prof. Alessandro Fioretti, president of the Ethics Committee of the University of Naples.
Compliance with ethical standards
Conflict of interest
The authors declare that this manuscript complies with Italian ethical standards and there is no conflict of interest.
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