The impact of action intention versus action-effect intention on auditory prediction error signals

When an action does not yield the sensory action effect associated with it, prediction error (PE) signals are generated. The present study investigates auditory event-related potential (ERP) markers of PE for violations of strong action-effect couplings as a function of whether the participants’ intention focuses on a particular action or a particular action effect. Participants produced high- and low-pitched tones by left and right button presses according to a pattern of visual stimuli. While the instruction as well as the action and tone sequences produced by the participants were identical, the type of intention induced by the visual symbols differed (in a between-subject design): In the action-effect intention group, the pattern consisted of “notes” (for high/low pitch), in the action intention group it consisted of “letters” (for left/right button-press). Occasionally, a button-press did not produce the associated sensory action effect. These incongruent sounds elicited an enhanced auditory N1 compared to congruent sounds in the “notes” but not the “letters” group which we interpret as PE signal. Actions selected by the intended action effect in the “notes” group presumably induced a predictive sensory representation of the action outcome, its violation resulting in an early PE at the level of the auditory N1. N2b and P3 were elicited in both groups. This suggests that the respective action-effect couplings were represented, and their violation processed at a conceptual level also in the “letters” group. These results support theories postulating that event representations bind together features of stimuli, actions, and associated outcomes.