The attentive homunculus: ERP evidence for somatotopic allocation of attention in tactile search

Our brain constantly receives tactile information from the body’s surface. We often only become aware of this information when directing our attention towards the body. Here, we report a study investigating the behavioural and neural response when selecting a target amongst distractor vibrations pre...

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Published inNeuropsychologia Vol. 84; pp. 158 - 166
Main Authors Forster, Bettina, Tziraki, Maria, Jones, Alexander
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.04.2016
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Abstract Our brain constantly receives tactile information from the body’s surface. We often only become aware of this information when directing our attention towards the body. Here, we report a study investigating the behavioural and neural response when selecting a target amongst distractor vibrations presented simultaneously to several locations either across the hands or body. Comparable visual search studies have revealed the N2pc as the neural correlate of visual selective attention. Analogously, we describe an enhanced negativity contralateral to the tactile target side. This effect is strongest over somatosensory areas and lasts approximately 200ms from the onset of the somatosensory N140 ERP component. Based on these characteristics we named this electrophysiological signature of attentional tactile target selection during tactile search the N140-central-contralateral (N140cc). Furthermore, we present supporting evince that the N140cc reflects attentional enhancement of target rather than suppression of distractor locations; the component was not reliably altered by distractor but rather by target location changes. Taken together, our findings present a novel electrophysiological marker of tactile search and show how attentional selection of touch operates by mainly enhancing task relevant locations within the somatosensory homunculus. •We investigated the ERP signature of tactile search.•We identified the N140cc as a marker of tactile attentional selection.•The N140cc mainly reflects enhancement of target location.•The N140cc may serve to trace allocation of attention to different limbs.•We provide evidence for somototopically specific allocation of attention.
AbstractList Our brain constantly receives tactile information from the body’s surface. We often only become aware of this information when directing our attention towards the body. Here, we report a study investigating the behavioural and neural response when selecting a target amongst distractor vibrations presented simultaneously to several locations either across the hands or body. Comparable visual search studies have revealed the N2pc as the neural correlate of visual selective attention. Analogously, we describe an enhanced negativity contralateral to the tactile target side. This effect is strongest over somatosensory areas and lasts approximately 200ms from the onset of the somatosensory N140 ERP component. Based on these characteristics we named this electrophysiological signature of attentional tactile target selection during tactile search the N140-central-contralateral (N140cc). Furthermore, we present supporting evince that the N140cc reflects attentional enhancement of target rather than suppression of distractor locations; the component was not reliably altered by distractor but rather by target location changes. Taken together, our findings present a novel electrophysiological marker of tactile search and show how attentional selection of touch operates by mainly enhancing task relevant locations within the somatosensory homunculus. •We investigated the ERP signature of tactile search.•We identified the N140cc as a marker of tactile attentional selection.•The N140cc mainly reflects enhancement of target location.•The N140cc may serve to trace allocation of attention to different limbs.•We provide evidence for somototopically specific allocation of attention.
Our brain constantly receives tactile information from the body's surface. We often only become aware of this information when directing our attention towards the body. Here, we report a study investigating the behavioural and neural response when selecting a target amongst distractor vibrations presented simultaneously to several locations either across the hands or body. Comparable visual search studies have revealed the N2pc as the neural correlate of visual selective attention. Analogously, we describe an enhanced negativity contralateral to the tactile target side. This effect is strongest over somatosensory areas and lasts approximately 200ms from the onset of the somatosensory N140 ERP component. Based on these characteristics we named this electrophysiological signature of attentional tactile target selection during tactile search the N140-central-contralateral (N140cc). Furthermore, we present supporting evince that the N140cc reflects attentional enhancement of target rather than suppression of distractor locations; the component was not reliably altered by distractor but rather by target location changes. Taken together, our findings present a novel electrophysiological marker of tactile search and show how attentional selection of touch operates by mainly enhancing task relevant locations within the somatosensory homunculus.
Our brain constantly receives tactile information from the body's surface. We often only become aware of this information when directing our attention towards the body. Here, we report a study investigating the behavioural and neural response when selecting a target amongst distractor vibrations presented simultaneously to several locations either across the hands or body. Comparable visual search studies have revealed the N2pc as the neural correlate of visual selective attention. Analogously, we describe an enhanced negativity contralateral to the tactile target side. This effect is strongest over somatosensory areas and lasts approximately 200 ms from the onset of the somatosensory N140 ERP component. Based on these characteristics we named this electrophysiological signature of attentional tactile target selection during tactile search the N140-central-contralateral (N140cc). Furthermore, we present supporting evince that the N140cc reflects attentional enhancement of target rather than suppression of distractor locations; the component was not reliably altered by distractor but rather by target location changes. Taken together, our findings present a novel electrophysiological marker of tactile search and show how attentional selection of touch operates by mainly enhancing task relevant locations within the somatosensory homunculus.
Author Jones, Alexander
Forster, Bettina
Tziraki, Maria
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Keywords Tactile attention
Tactile search
Somatosensory system
Body
Attentional selection
Language English
License Copyright © 2016 Elsevier Ltd. All rights reserved.
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Snippet Our brain constantly receives tactile information from the body’s surface. We often only become aware of this information when directing our attention towards...
Our brain constantly receives tactile information from the body's surface. We often only become aware of this information when directing our attention towards...
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SubjectTerms Adolescent
Adult
Attention - physiology
Attentional selection
Body
Brain - physiology
Brain Mapping
Electroencephalography
Evoked Potentials, Somatosensory
Female
Functional Laterality - physiology
Hand - physiology
Humans
Male
Neuropsychological Tests
Physical Stimulation - methods
Somatosensory system
Tactile attention
Tactile search
Toes - physiology
Touch Perception - physiology
Young Adult
Title The attentive homunculus: ERP evidence for somatotopic allocation of attention in tactile search
URI https://dx.doi.org/10.1016/j.neuropsychologia.2016.02.009
https://www.ncbi.nlm.nih.gov/pubmed/26898371
https://search.proquest.com/docview/1776093797
https://search.proquest.com/docview/1790940350
Volume 84
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