Cross-modal attention capture by affective stimuli: Evidence from event-related potentials |
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Authors: | Andreas Keil Margaret M Bradley Markus Junghöfer Thomas Russmann William Lowenthal Peter J Lang |
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Institution: | (1) Erasmus Affective Neuroscience Lab, Institute of Psychology, Erasmus University Rotterdam, Rotterdam, The Netherlands;(2) Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands;(3) Institute of Psychology, Erasmus University Rotterdam, Woudestein J5-43, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands |
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Abstract: | The P3 component of the event-related potential (ERP) to an acoustic startle probe is modulated during picture viewing, with
reduced P3 amplitude when participants view either pleasant or unpleasant, as opposed to neutral, pictures. We have interpreted
this as reflecting capture of attentional resources by affective pictures, with fewer resources available for processing the
secondary startle probe. In the present study, we tested this resource allocation hypothesis by presenting either pictures
or sounds as foreground stimuli, with the prediction that P3 amplitude in response to secondary startle probes would be reduced
for affectively engaging foregrounds regardless of modality. Using dense-array electroencephalography and a source estimation
procedure, we observed that P3 amplitude was indeed smaller when startle probes were presented during emotional, as opposed
to neutral, stimuli for both sound and picture foregrounds. Source modeling indicated a common frontocentral maximum of P3
modulation by affect. The data support the notion that emotionally arousing stimuli transmodally attract resources, leading
to optimized processing of the affective stimuli at the cost of the processing of concurrent stimuli. |
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