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Open AccessArticle

Left-Hemispheric Asymmetry for Object-Based Attention: an ERP Study

Neuro-MI, Milan Center for Neuroscience, Dept. of Psychology, University of Milano - Bicocca, Milan 20126, Italy
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Author to whom correspondence should be addressed.
Brain Sci. 2019, 9(11), 315; https://doi.org/10.3390/brainsci9110315
Received: 26 September 2019 / Revised: 30 October 2019 / Accepted: 6 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue ERP and EEG Markers of Brain Visual Attentional Processing)
It has been shown that selective attention enhances the activity in visual regions associated with stimulus processing. The left hemisphere seems to have a prominent role when non-spatial attention is directed towards specific stimulus features (e.g., color, spatial frequency). The present electrophysiological study investigated the time course and neural correlates of object-based attention, under the assumption of left-hemispheric asymmetry. Twenty-nine right-handed participants were presented with 3D graphic images representing the shapes of different object categories (wooden dummies, chairs, structures of cubes) which lacked detail. They were instructed to press a button in response to a target stimulus indicated at the beginning of each run. The perception of non-target stimuli elicited a larger anterior N2 component, which was likely associated with motor inhibition. Conversely, target selection resulted in an enhanced selection negativity (SN) response lateralized over the left occipito-temporal regions, followed by a larger centro-parietal P300 response. These potentials were interpreted as indexing attentional selection and categorization processes, respectively. The standardized weighted low-resolution electromagnetic tomography (swLORETA) source reconstruction showed the engagement of a fronto-temporo-limbic network underlying object-based visual attention. Overall, the SN scalp distribution and relative neural generators hinted at a left-hemispheric advantage for non-spatial object-based visual attention. View Full-Text
Keywords: selective attention; object-based attention; hemispheric asymmetry; ERP; selection negativity; swLORETA; anterior cingulate cortex; visual recognition selective attention; object-based attention; hemispheric asymmetry; ERP; selection negativity; swLORETA; anterior cingulate cortex; visual recognition
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Orlandi, A.; Proverbio, A.M. Left-Hemispheric Asymmetry for Object-Based Attention: an ERP Study. Brain Sci. 2019, 9, 315.

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