Being the third wheel: Toddlers use bystander learning to acquire cue-specific valence knowledge.

Observing others is an important means of gathering information by proxy regarding safety and danger, a form of learning that is available as early as infancy. In two experiments, we examined the specificity and retention of emotional eavesdropping (i.e., bystander learning) on cue-specific discriminant learning during toddlerhood. After witnessing one adult admonish another for playing with Toy A (with no admonishment for Toy B), toddlers learned to choose Toy B for themselves regardless of whether they were tested immediately or 2 weeks later (Experiment 1). However, if asked to make a toy choice for someone else (i.e., when toddlers' personal risk was lower), approximately half the toddlers instead selected Toy A (Experiment 2). However, such choices were accompanied by toddlers' social monitoring of the adults, suggesting that toddlers may have been attempting to safely gain (via surrogacy) more information about risk contingencies. These findings suggest that toddlers can learn to discriminate valence in a cue-specific manner through social observation.