Abstract
Simple SummaryComparative investigations on infants’ and dogs’ social and communicative skills revealed striking similarity, which can be attributed to convergent evolutionary and domestication processes. Using a suitable experimental method that allows systematic and direct comparisons of dogs and humans is essential. In the current study, we used non-invasive eye-tracking technology in order to investigate looking behaviour of dogs and human infants in an auditory–visual matching task. We found a similar gazing pattern in the two species when they were presented with pictures and vocalisations of a dog and a female human, that is, both dogs and infants looked longer at the dog portrait during the dog’s bark, while matching human speech with the human face was less obvious. Our results suggested different mechanisms underlying this analogous behaviour and highlighted the importance of future investigations into cross-modal cognition in dogs and humans.We tested whether dogs and 14–16-month-old infants are able to integrate intersensory information when presented with conspecific and heterospecific faces and vocalisations. The looking behaviour of dogs and infants was recorded with a non-invasive eye-tracking technique while they were concurrently presented with a dog and a female human portrait accompanied with acoustic stimuli of female human speech and a dog’s bark. Dogs showed evidence of both con- and heterospecific intermodal matching, while infants’ looking preferences indicated effective auditory–visual matching only when presented with the audio and visual stimuli of the non-conspecifics. The results of the present study provided further evidence that domestic dogs and human infants have similar socio-cognitive skills and highlighted the importance of comparative examinations on intermodal perception.
Highlights
Integration of information coming from several sensory modalities is essential for communication and individual recognition in several species
We investigated whether adult dogs and 14–16-month-old human infants show auditory–visual matching of con- and heterospecific faces and voices
At the congruent picture that corresponded to the sound of intermodal matching. (i) Dogs looked first at the congruent picture that corresponded to the sound played back even if the vocaliser was a heterospecific, while their looking duration provided evidence played back even if the vocaliser was a heterospecific, while their looking duration provided evidence of intermodal matching only for conspecifics. (ii) Similar to dogs, infants looked longer at the dog picture while hearing the bark; they did not adjust their first fixation to the voice congruent picture and, compared with dogs, they fixated more at the picture of the heterospecific when it was voice incongruent
Summary
Integration of information coming from several sensory modalities is essential for communication and individual recognition in several species. Is commonly used for studying intermodal cognition in humans [1] and non-human animals [3]. In these experiments, subjects are concurrently presented with two visual displays accompanied with a single auditory stimulus corresponding to one of them. Based on spontaneous preferences for looking at a specific visual stimulus, researchers can infer how participants match the pictures with the sound played. Using this paradigm, Walker-Andrews and co-workers [4] showed that six-, but not three-, Animals 2019, 9, 17; doi:10.3390/ani9010017 www.mdpi.com/journal/animals
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