title: Visual noise effects on emotion perception: brain potentials and stimulus identification.
abstract: Event-related potential (ERP) studies revealed an early posterior negativity (EPN) for emotionally arousing pictures. Two studies explored how this effect relates to perceptual stimulus characteristics and stimulus identification. Adding various amounts of visual noise varied stimulus perceptibility of high and low arousing picture contents, which were presented as rapid and continuous stream. Measuring dense sensor event-related potentials, study I determined that noise level was linearly related to the P1 peak. Subsequently, enlarged EPNs to emotionally arousing contents were observed, however, only for pictures containing low amounts of noise, which also enabled stimulus identification as shown by study II. These data support the notion that the EPN may serve as a measure of affective stimulus evaluation at an early transitory processing period.
authors.affiliation: Department of Psychology, University of Konstanz, University of Greifswald, Germany. Harald.Schupp@uni-konstanz.de
authors.forename: Harald T
authors.initials: HT
authors.lastname: Schupp
authors.forename: Jessica
authors.initials: J
authors.lastname: Stockburger
authors.forename: Ralf
authors.initials: R
authors.lastname: Schmälzle
authors.forename: Florian
authors.initials: F
authors.lastname: Bublatzky
authors.forename: Almut I
authors.initials: AI
authors.lastname: Weike
authors.forename: Alfons O
authors.initials: AO
authors.lastname: Hamm
mesh_terms: D000328:Adult; D001143:Arousal / Q000502:physiology*; D016477:Artifacts; D001288:Attention / Q000502:physiology*; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000033:anatomy & histology / Q000502:physiology*; D004569:Electroencephalography; D004644:Emotions / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology*