Selective responding to human ostensive communication is an early developing capacity of domestic dogs

Abstract

Ostensive communication, communication motivated not only by an informative intention, but also by an intention to make this informative intention overt, is thought to be restricted to human signalers and to rely on metacognitive skills. On the receiver side, human infants and dogs have been found to selectively respond to human ostensive communication, even if it remains unclear whether they are able to discern the underlying intentions. At present only animals with extensive experiences with humans have demonstrated a response to human attention calling, suggesting that this sensitivity may be an exaptation of communicative skills allowing for context-specific responding to intraspecific signals. We investigated whether dogs could respond to subtle cues of ostension without clear attention-calling and how this skill varies across age and with different human-given signals. Using a two-way object choice task, we evaluated whether dogs of different ages followed, with their gaze and with their choices, ostensive human pointing and gaze more than a formally similar but non-ostensive gesture and a directional gaze cue. Dogs followed pointing more than gaze, and older dogs followed the directional cues more accurately than younger dogs. Independent of cue type, we found that dogs of all ages responded to human ostensive signals more than similar directional cues motivated by no communicative intention. Given that dogs are sensitive to subtle cues of ostensive communication from an early age, and that this does not appear to change with age, we suggest that living close to humans may have selected for this skill. RESEARCH HIGHLIGHTS: Like human infants, dogs followed human ostensive cues more than non-ostensive cues both by their approach behavior and their differential looking behavior. Dogs differentiated between ostensive and non-ostensive human cues from an early age on, without their attention having been called explicitly in advance. Dogs followed human-given pointing cues more than human-given gaze cues, independent of age or intention (ostensive or non-ostensive). The early developing sensitivity of dogs to human ostension suggests that living close to humans may have selected for this skill.

Keywords: communication; dog; gaze; object-choice task; ostensive; pointing.