| Popis: |
The main objective of the proposed project is to identify neurocognitive mechanisms that affect the processing of immediate and delayed feedback. The focus is on two Event-Related Potential (ERP) components, namely the Feedback-Related Negativity (FRN) and the N170, which reflect dopamine (DA) influences on the striatum and processing in extrastriate visual areas in the temporal cortex, respectively, and have been shown to be affected by feedback delay. Delaying feedback should lead to a shift from striatal brain activity to temporal brain activity. We want to show that the delay effect on the respective amplitudes depends on the type of event-feedback association (action-feedback vs. stimulus-feedback). Striatal feedback activation is usually very pronounced for action-feedback associations, and we assume that stimulus-feedback associations activate more visual, i.e. temporal, brain areas during feedback processing. For the study, we plan one group of participants that will learn action-feedback associations, and two groups that will learn stimulus-feedback associations (factor Feedback Association) with both immediate and delayed feedback (factor Feedback Timing). In each trial, one of two actions or stimuli is associated with a reward probability of 35% and the respective other with a reward probability of 65%, resulting in either positive or negative feedback (factor Feedback Valence). We will measure behavioral accuracy data during learning and during subsequent tests, as well as FRN and N170 amplitudes. In addition, we will calculate the unsigned prediction error (unsigned PE) to integrate participants’ expectations in a second analyses. |
