Poster F40, Tuesday, March 28, 8:00 – 10:00 am, Pacific Concourse
The influence of different feature repetition conditions on the sequential modulation of the Simon effect: An EEG study
Katharina Hoppe1, Kristina Küper1, Edmund Wascher1; 1Leibniz Research Centre for Working Environment and Human Factors (IfADo)
In stimulus-response compatibility tasks, subjects show a better performance when stimulus features and the required response are compatible. In the Simon task, for example, responses are faster when the task-irrelevant stimulus location corresponds to the response location compared to when they are non-corresponding. Interestingly, this Simon effect is reduced after non-corresponding trials, which is often described as a phenomenon of conflict adaptation. Due to inherent repetitions of task features, these sequential modulations are also explainable by feature integration and/or priming effects. For this reason, we investigated sequential modulations of the Simon effect while controlling for feature integration as well as for priming effects. By using a Simon task mapping four stimuli to two response keys, we created three subsets containing trials with different feature repetition conditions: 1) repetition of all task features, 2) repetition of response and irrelevant stimulus position, but an alternation of the relevant stimulus identity and 3) repetition of irrelevant stimulus location and an alternation of all task features. Overall, the data pattern shows a huge performance advantage for the first subset. While this might reflect underlying priming effects, this pattern does not display feature integration effects. Furthermore, within each subset sequential modulations of the Simon effect were found. Since subsequent stimuli were controlled for feature repetitions, conflict adaptation effects might explain this result best. In order to investigate differences between the subsets with respect to underlying cognitive control, response selection and priming processes, we analysed event-related potentials, i.e. N2, P3 and N2pc, of the EEG.
Topic Area: EXECUTIVE PROCESSES: Other