Poster E91, Monday, March 26, 2:30-4:30 pm, Exhibit Hall C
Reward processing during dyadic social interaction: An EEG study of parents and young children
Julia Anna Adrian1, Kevin Jenson1, Alvin Li1, Scott Makeig2, Gedeon Deak1; 1UC San Diego, Cognitive Science, 2Swartz Center for Computational Neuroscience
Actions are often motivated by the expectancy of a certain outcome. We investigated neural correlates of expected and unexpected outcome processing through EEG recordings during social interaction. Dyads of parents and their children (range: 3-6 years old) played a turn-taking game. In every trial one participant chose to touch one of two options on a touch screen, yielding a high or low reward outcome. The dyad learned a cooperative rule for obtaining high-reward outcomes through trial and error. Thereafter, the reward contingency was randomly reversed in 20% of trials, eliciting prediction errors. Independent component analysis (ICA) was used to exclude non-brain components. Event-related potentials (ERPs) were time-locked to own and partner’s actions. Previous studies found an association between the amplitude of a late positive ERP component (P3) and reward processing. Children could be divided into two groups based on their ERPs: those whose P3 amplitude was larger for high versus low reward (independent of expectancy), and those whose P3 was larger for unexpected versus expected outcomes (independent of reward magnitude). Notably, children did not exhibit a P3 component in response to their parents’ outcomes. Parents' P3 amplitudes were more strongly modulated by their children's action outcomes than their own. Their P3 amplitude was large for expected high and unexpected low reward, the two possible outcomes after a correct action. We conclude that this event-related potential dependency might be an indication of parents’ increased attention to the consequences of their children’s actions than to their own.
Topic Area: PERCEPTION & ACTION: Development & aging