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Neuroimaging evidence for processes underlying repetition of ignored stimuli

Bauer, Eva ; Gebhardt, Helge ; Ruprecht, Christoph ; Gallhofer, Bernd ; Sammer, Gebhard

Originalveröffentlichung: (2012) PLoS ONE, 7(5), e36089, 1-10 doi:10.1371/journal.pone.0036089
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URN: urn:nbn:de:hebis:26-opus-87230

Freie Schlagwörter (Englisch): negative priming effect , prolonged response times , distractor , functional magnetic resonance imaging (fMRI) , inhibitory and retrieval processes
Sammlung: Open Access - Publikationsfonds
Universität Justus-Liebig-Universit√§t Gie√üen
Institut: Cognitive Neuro Science at the Centre for Psychiatry
Fachgebiet: Medizin fach√ľbergreifend
DDC-Sachgruppe: Medizin
Dokumentart: Aufsatz
Sprache: Englisch
Erstellungsjahr: 2012
Publikationsdatum: 07.05.2012
Kurzfassung auf Englisch: Prolonged response times are observed with targets having been presented as distractors immediately before, called negative priming effect. Among others, inhibitory and retrieval processes have been suggested underlying this behavioral effect. As those processes would involve different neural activation patterns, a functional magnetic resonance imaging (fMRI) study including 28 subjects was conducted. Two tasks were used to investigate stimulus repetition effects. One task focused on target location, the other on target identity. Both tasks are known to elicit the expected response time effects. However, there is less agreement about the relationship of those tasks with the explanatory accounts under consideration. Based on within-subject comparisons we found clear differences between the experimental repetition conditions and the neutral control condition on neural level for both tasks. Hemodynamic fronto-striatal activation patterns occurred for the location-based task favoring the selective inhibition account. Hippocampal activation found for the identity-based task suggests an assignment to the retrieval account; however, this task lacked a behavioral effect.
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