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To determine the role of action-outcome learning in the control of young children's instrumental behavior, the authors trained 18- to 48-month-olds to manipulate visual icons on a touch-sensitive display to obtain different types of video clips as outcomes. Subsequently, one of the outcomes was devalued by repeated exposure, and children's propensity to perform the trained actions was tested in extinction. On test, children with a mean age greater than 2.5 years performed the action trained with the devalued outcome less than those trained with the still-valued outcome, thereby demonstrating that their actions were mediated by action-outcome learning. By contrast, the instrumental responses of younger children (mean age<2 years) were resistant to outcome devaluation and may have been elicited directly by the icons associated with each response, rather than mediated by a specific action-outcome expectation.
Klossek et al. (Fri,) studied this question.