Motivated and controlled attention to emotion: Time-course of the late positive potential
| Autor: | Jonathan P. Dunning, Greg Hajcak, Dan Foti |
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| Rok vydání: | 2009 |
| Předmět: |
Male
Controlled attention Time Factors Visual perception Adolescent Emotions Neuropsychological Tests Developmental psychology Young Adult Picture viewing Physiology (medical) Significance testing Reaction Time Humans Attention Evoked Potentials Cerebral Cortex Motivation Emotional stimuli Electroencephalography Signal Processing Computer-Assisted Cognition Sensory Systems Psychophysiology Neurology Time course Female Neurology (clinical) Arousal Psychology Photic Stimulation Cognitive psychology |
| Zdroj: | Clinical Neurophysiology. 120:505-510 |
| ISSN: | 1388-2457 |
| Popis: | Objective The present study examined the time-course of automatic and controlled modulation of the late positive potential (LPP) during emotional picture viewing. Methods Participants ( N =32) viewed neutral and unpleasant stimuli for 6000ms; at 3000ms, one of two tones signaled participants to attend either to a more or less arousing portion of the picture. The time-course of the LPP was examined both during the passive viewing and directed attention portions of the trial using the method proposed by Guthrie and Buchwald [Guthrie D, Buchwald JS. Significance testing of difference potentials. Psychophysiology 1991;28(2):240–4]. Results During passive viewing, the LPP became reliably larger following the presentation of unpleasant pictures from 160ms onward; the magnitude of the LPP became reliably smaller beginning 620ms after participants were instructed to attend to the less arousing aspects of unpleasant pictures – and this difference was maintained throughout the duration of the trial. Conclusions The LPP reflects relatively automatic attention to emotional visual stimuli, but is also sensitive to manipulations of directed attention toward arousing versus neutral aspects of such stimuli. Significance These results shed further light on the time-course of emotional and cognitive modulation of the LPP, and suggest that the LPP reflects the relatively rapid and dynamic allocation of increased attention to emotional stimuli. |
| Databáze: | OpenAIRE |
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