Nasotemporal ERP differences: evidence for increased inhibition of temporal distractors

Bibliographic Details
Authors and Corporations: Huber-Huber, Christoph, Grubert, Anna, Ansorge, Ulrich, Eimer, Martin
Title: Nasotemporal ERP differences: evidence for increased inhibition of temporal distractors
In: Journal of Neurophysiology, 113, 2015, 7, p. 2210-2219
published:
American Physiological Society
Physical Description:2210-2219
ISSN/ISBN: 0022-3077
1522-1598
Summary:<jats:p> Previous research has demonstrated behavioral advantages for stimuli in the temporal relative to the nasal visual hemifield. To investigate whether this nasotemporal asymmetry reflects a genuinely attentional bias, we recorded event-related potentials in a task where participants identified a color-defined target digit in one visual hemifield that was accompanied by an irrelevant distractor in the opposite hemifield ( experiment 1). To dissociate the processing of stimuli in nasal and temporal visual hemifields, an eye-patching procedure was used. Targets triggered N2pc components that marked their attentional selection. Unexpectedly, these N2pc components were larger and emerged earlier for nasal relative to temporal targets. Experiment 2 provided evidence that this nasotemporal asymmetry for the N2pc is linked to an increased attentional inhibition of temporal distractors. Relative to nasal distractors, temporal distractors elicited an increased inhibition-related contralateral positivity, resulting in more pronounced differences between contralateral and ipsilateral event-related potentials on trials with temporal distractors and nasal targets. These results provide novel evidence for a genuinely attentional contribution to nasotemporal asymmetries and suggest that such asymmetries are associated with top-down controlled distractor inhibition. </jats:p>
Type of Resource:E-Article
Source:American Physiological Society (CrossRef)
Language: English