Attentional bias to affective faces and complex IAPS images in early visual cortex follows emotional cue extraction

Bekhtereva, V., Craddock, Matthew and Müller, M.M. (2015) Attentional bias to affective faces and complex IAPS images in early visual cortex follows emotional cue extraction. NeuroImage, 112 . pp. 254-266. ISSN 10538119

Full content URL: http://doi.org/10.1016/j.neuroimage.2015.03.052

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Attentional bias to affective faces and complex IAPS images in early visual cortex follows emotional cue extraction
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Abstract

Emotionally arousing stimuli are known to rapidly draw the brain's processing resources, even when they are task-irrelevant. The steady-state visual evoked potential (SSVEP) response, a neural response to a flickering stimulus which effectively allows measurement of the processing resources devoted to that stimulus, has been used to examine this process of attentional shifting. Previous studies have used a task in which participants detected periods of coherent motion in flickering random dot kinematograms (RDKs) which generate an SSVEP, and found that task-irrelevant emotional stimuli withdraw more attentional resources from the task-relevant RDKs than task-irrelevant neutral stimuli. However, it is not clear whether the emotion-related differences in the SSVEP response are conditional on higher-level extraction of emotional cues as indexed by well-known event-related potential (ERPs) components (N170, early posterior negativity, EPN), or if affective bias in competition for visual attention resources is a consequence of a time-invariant shifting process. In the present study, we used two different types of emotional distractors - IAPS pictures and facial expressions - for which emotional cue extraction occurs at different speeds, being typically earlier for faces (at ~ 170. ms, as indexed by the N170) than for IAPS images (~ 220-280 ms, EPN). We found that emotional modulation of attentional resources as measured by the SSVEP occurred earlier for faces (around 180. ms) than for IAPS pictures (around 550. ms), after the extraction of emotional cues as indexed by visual ERP components. This is consistent with emotion related re-allocation of attentional resources occurring after emotional cue extraction rather than being linked to a time-fixed shifting process. © 2015 Elsevier Inc.

Keywords:adult, affect, attention, electroencephalography, evoked response, face, facial expression, fear, human, perception, psychology, vision, visual cortex, Cues, Evoked Potentials, Humans, Visual Perception
Subjects:C Biological Sciences > C800 Psychology
C Biological Sciences > C850 Cognitive Psychology
Divisions:College of Social Science > School of Psychology
ID Code:30954
Deposited On:01 Nov 2019 15:36

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