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This particularity might slower the habituation pattern.Furthermore, when we looked specifically to the acoustic features that interacted with dogs’ attention, we found that adult dogs’ attention increased along with the rise of the fundamental frequency of women’ speech.We hypothesize that both puppies and adult dogs will be more attentive in response to the exacerbated prosodic features of PDS and IDS than to those of ADS, but that they will be comparably attentive to PDS and IDS prosodic and syntactic features that are distinct from ADS.

the effect of PDS in adult dogs when the speech is broadcast in first position; see below Effect of the type of speech in adult dogs.Table 1: Effect of the presence of children at home, dogs’ familiarity with people of both gender, dogs’ sex, type of speech (adult-directed, infant-directed, pet-directed), playback order and dogs’ age on dogs’ behavioural response to playback.Subsequent Pearson correlation tests show that adult dogs’ attention significantly increased along with the rise of the fundamental frequency of women’ speech (Table 3). For each type of speech and for each playback position, we compared the gaze duration of adult dogs and puppies (for instance: ADS in the first playback position, then ADS in the second playback position etc.).All other correlations were non-significant (Table 3). No significant difference was found (P As expected, adult dogs discriminated between ADS and PDS and displayed longer gaze duration when listening to PDS compared to ADS.These two types of speech share prosodic and syntactic features that are distinct from the typical adult-directed speech (ADS): a high pitched voice, an increased pitch variation, short utterances, a reduced syntactic and semantic complexity, and word repetitions.

PDS and IDS may be similar because both infants and dogs are non-verbal listeners and because the affective bond between owners and dogs mirrors the human parents-infant bond.

Humans speak to dogs using a special speech register called Pet-Directed Speech (PDS) which is very similar to Infant-Directed Speech (IDS) used by parents when talking to young infants.

These two type of speech share prosodic features that are distinct from the typical Adult-Directed Speech (ADS): a high pitched voice and an increased pitch variation.

Table 3: Correlations between acoustic features (Mean F0, F0CV and Int CV) and dogs’ attention for each age and for each type of speech (adult-directed, infant-directed and pet-directed speech). This result disappeared when the vocal stimulus was broadcast in third position, suggesting a possible habituation phenomenon to the repetition of PDS stimuli.

Regarding vocal stimuli played in first position, dogs’ responses to IDS were intermediate between responses to ADS and PDS, but the difference between IDS and PDS, as well as the difference between IDS and ADS never reached significance.

As previously mentioned, puppies remained alert whatever the intensity of the acoustic parameters.