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    Nasotemporal ERP differences: evidence for increased inhibition of temporal distractors

    Huber-Huber, C. and Grubert, Anna and Ansorge, U. and Eimer, Martin (2015) Nasotemporal ERP differences: evidence for increased inhibition of temporal distractors. Journal of Neurophysiology 113 (7), pp. 2210-2219. ISSN 0022-3077.

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    Abstract

    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.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Attention, visual hemifield, nasotemporal asymmetry, event-related potentials, N2pc, inhibition
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 20 Dec 2016 12:51
    Last Modified: 20 Dec 2016 12:51
    URI: http://eprints.bbk.ac.uk/id/eprint/17637

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