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Hemispheric Dissociation Revealed by Attentional Isolation and Transcranial Random Noise Stimulation.

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Title: Hemispheric Dissociation Revealed by Attentional Isolation and Transcranial Random Noise Stimulation.
Authors: Tosi, Michele1,2 (AUTHOR), Ellena, Giulia1,2 (AUTHOR), Contò, Federica2,3 (AUTHOR), Edwards, Grace4 (AUTHOR), Battelli, Lorella2,5 (AUTHOR) lbattell@bidmc.harvard.edu
Source: Journal of Cognitive Neuroscience. Jul2026, Vol. 38 Issue 7, p1395-1405. 11p.
Subjects: Attention control, Neural stimulation, Neurophysiology, Neurosciences, Brain stimulation, Neurorehabilitation
Abstract: Prolonged cognitive imbalance, induced by directing attention to one visual field, can paradoxically enhance performance in the opposite, nonattended visual field. This effect is likely driven by the brain's homeostatic mechanisms that regulate excitation and inhibition between hemispheres in homotopic attention processing regions. Here, we employed transcranial random noise stimulation (tRNS) to modulate cortical excitability and probe its role in interhemispheric dynamics controlling visual attention. Specifically, we used a procedure called attentional isolation, where neurotypical participants covertly focused their visual attention in one hemifield (the attended visual field) for 30 min. Performance changes in both the unattended (opposite) visual field and the attended visual field were measured following this manipulation. We applied tRNS over the right or left frontoparietal cortex to modulate the excitability of one hemisphere relative to the other during attention isolation, probing the neural mechanisms underlying the observed contralateral performance shift. Our results showed improved performance in the previously unattended visual field following the attentional isolation period after sham stimulation. However, tRNS revealed a functional dissociation between the hemispheres: Right hemisphere active stimulation abolished the performance improvement, while left hemisphere stimulation preserved it. These findings suggest distinct roles for the left and right hemispheres in modulating paradoxical visual performance shifts and may inform the development of novel neurorehabilitation strategies for clinical populations. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Cognitive Neuroscience is the property of MIT Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 194945057
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Hemispheric Dissociation Revealed by Attentional Isolation and Transcranial Random Noise Stimulation.
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  Data: <searchLink fieldCode="AR" term="%22Tosi%2C+Michele%22">Tosi, Michele</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ellena%2C+Giulia%22">Ellena, Giulia</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Contò%2C+Federica%22">Contò, Federica</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Edwards%2C+Grace%22">Edwards, Grace</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Battelli%2C+Lorella%22">Battelli, Lorella</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)<i> lbattell@bidmc.harvard.edu</i>
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  Data: <searchLink fieldCode="DE" term="%22Attention+control%22">Attention control</searchLink><br /><searchLink fieldCode="DE" term="%22Neural+stimulation%22">Neural stimulation</searchLink><br /><searchLink fieldCode="DE" term="%22Neurophysiology%22">Neurophysiology</searchLink><br /><searchLink fieldCode="DE" term="%22Neurosciences%22">Neurosciences</searchLink><br /><searchLink fieldCode="DE" term="%22Brain+stimulation%22">Brain stimulation</searchLink><br /><searchLink fieldCode="DE" term="%22Neurorehabilitation%22">Neurorehabilitation</searchLink>
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  Data: Prolonged cognitive imbalance, induced by directing attention to one visual field, can paradoxically enhance performance in the opposite, nonattended visual field. This effect is likely driven by the brain's homeostatic mechanisms that regulate excitation and inhibition between hemispheres in homotopic attention processing regions. Here, we employed transcranial random noise stimulation (tRNS) to modulate cortical excitability and probe its role in interhemispheric dynamics controlling visual attention. Specifically, we used a procedure called attentional isolation, where neurotypical participants covertly focused their visual attention in one hemifield (the attended visual field) for 30 min. Performance changes in both the unattended (opposite) visual field and the attended visual field were measured following this manipulation. We applied tRNS over the right or left frontoparietal cortex to modulate the excitability of one hemisphere relative to the other during attention isolation, probing the neural mechanisms underlying the observed contralateral performance shift. Our results showed improved performance in the previously unattended visual field following the attentional isolation period after sham stimulation. However, tRNS revealed a functional dissociation between the hemispheres: Right hemisphere active stimulation abolished the performance improvement, while left hemisphere stimulation preserved it. These findings suggest distinct roles for the left and right hemispheres in modulating paradoxical visual performance shifts and may inform the development of novel neurorehabilitation strategies for clinical populations. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Cognitive Neuroscience is the property of MIT Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1162/JOCN.a.2587
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        Text: English
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        PageCount: 11
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        Type: general
      – SubjectFull: Neural stimulation
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      – SubjectFull: Neurophysiology
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      – SubjectFull: Neurorehabilitation
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      – TitleFull: Hemispheric Dissociation Revealed by Attentional Isolation and Transcranial Random Noise Stimulation.
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            NameFull: Tosi, Michele
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            NameFull: Contò, Federica
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              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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