Do Stroop congruency levels modulate early and late feature-based attention effects? An ERP study J Siemann, M Herrmann, D Galashan |
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Department of Neuropsychology and Behavioral Neurobiology, University of Bremen, Germany
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| Non-spatial attention to different feature stimuli is associated with distinct modulations in ERP components. Both the Selection Negativity (SN), reflecting early attentional selection mechanisms, and the P3, presumed to underlie stimulus evaluation processes, demonstrate a larger amplitude for attended than unattended features. The present study addresses the question how these feature-based attention components are modulated by stimulus congruency in an interference task. A version of the Stroop task was combined with feature cues directing attention to the upcoming target color. The cues were valid or invalid and the Stroop stimuli were either congruent, incongruent or neutral. Behavioral and EEG data from 12 participants were analyzed. The attention effect with neutral Stroop stimuli served as a baseline and was compared with the attention effects associated with congruent and incongruent Stroop stimuli, respectively. It was hypothesized that the SN and the P3 would be differentially altered by the stimulus congruency level. Thus, invalid cueing was expected to lead to more elaborate processing of the stimulus word, causing opposing effects for congruent compared with incongruent stimuli. Accordingly, preliminary data analysis suggests that the distribution of the attention effect (both SN and P3) was altered for these stimuli when compared to the baseline. |
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