Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence
Crossing the hands over the midline reduces left tactile extinction to double simultaneous stimulation in right-brain-damaged patients, suggesting that spatial-attentional biases towards the ipsilesional (right) side of space contribute to the patients’ contralesional (left) deficit. We investigated...
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doaj-aaf9f63428234bd1a572ee917f3af5f82020-11-25T02:14:46ZengFrontiers Media S.A.Frontiers in Human Neuroscience1662-51612012-07-01610.3389/fnhum.2012.0021723953Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidenceChiara Francesca Sambo0Chiara Francesca Sambo1Giuseppe eVallar2Giuseppe eVallar3Paola eFortis4Paola eFortis5Roberta eRonchi6Roberta eRonchi7Lucio ePosteraro8Bettina eForster9Angelo eMaravita10University College LondonCity University LondonUniversity of Milano-BicoccaIRCCS Italian Auxological InstituteUniversity of Milano-BicoccaCentre for Neurocognitive Rehabilitation, University of TrentoUniversity of Milano-BicoccaIRCCS Italian Auxological InstituteRehabilitation Unit, Suzzara (Mantova)City University LondonUniversity of Milano-BicoccaCrossing the hands over the midline reduces left tactile extinction to double simultaneous stimulation in right-brain-damaged patients, suggesting that spatial-attentional biases towards the ipsilesional (right) side of space contribute to the patients’ contralesional (left) deficit. We investigated (1) whether the position of the left hand, and its vision, affected processing speed of tactile stimuli, and (2) the electrophysiological underpinnings of the effect of hand position. (1) Four right-brain-damaged patients with spatial neglect and contralesional left tactile extinction or somatosensory deficits, and eight neurologically unimpaired participants, performed a speeded detection task on single taps delivered on their left index finger. In patients, placing the left hand in the right (heteronymous) hemi-space resulted in faster reaction times (RTs) to tactile stimuli, compared to placing that hand in the left (homonymous) hemi-space, particularly when the hand was visible. By contrast, in controls placing the left hand in the heteronymous hemi-space increased RTs. (2) Somatosensory event-related potentials were recorded from one patient and two controls in response to the stimulation of the left hand, placed in the two spatial positions. In the patient, the somatosensory P70, N140, and N250 components were enhanced when the left hand was placed in the heteronymous hemi-space, whereas in controls these components were not modulated by hand position. The novel findings are that in patients placing the left hand in the right, ipsilesional hemi-space yields a temporal advantage in processing tactile stimuli, and this effect may rely on a modulation of stimulus processing taking place as early as in the primary somatosensory cortex, as indexed by evoked potentials. Furthermore, vision enhances tactile processing specifically when the left hand is placed in the hemi-space towards which the patients’ attentional biases are pathologically directed, namely rightwards.http://journal.frontiersin.org/Journal/10.3389/fnhum.2012.00217/fullAttentionmultisensoryspaceERPshand crossingtactile extinction |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chiara Francesca Sambo Chiara Francesca Sambo Giuseppe eVallar Giuseppe eVallar Paola eFortis Paola eFortis Roberta eRonchi Roberta eRonchi Lucio ePosteraro Bettina eForster Angelo eMaravita |
spellingShingle |
Chiara Francesca Sambo Chiara Francesca Sambo Giuseppe eVallar Giuseppe eVallar Paola eFortis Paola eFortis Roberta eRonchi Roberta eRonchi Lucio ePosteraro Bettina eForster Angelo eMaravita Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence Frontiers in Human Neuroscience Attention multisensory space ERPs hand crossing tactile extinction |
author_facet |
Chiara Francesca Sambo Chiara Francesca Sambo Giuseppe eVallar Giuseppe eVallar Paola eFortis Paola eFortis Roberta eRonchi Roberta eRonchi Lucio ePosteraro Bettina eForster Angelo eMaravita |
author_sort |
Chiara Francesca Sambo |
title |
Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence |
title_short |
Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence |
title_full |
Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence |
title_fullStr |
Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence |
title_full_unstemmed |
Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence |
title_sort |
visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Human Neuroscience |
issn |
1662-5161 |
publishDate |
2012-07-01 |
description |
Crossing the hands over the midline reduces left tactile extinction to double simultaneous stimulation in right-brain-damaged patients, suggesting that spatial-attentional biases towards the ipsilesional (right) side of space contribute to the patients’ contralesional (left) deficit. We investigated (1) whether the position of the left hand, and its vision, affected processing speed of tactile stimuli, and (2) the electrophysiological underpinnings of the effect of hand position. (1) Four right-brain-damaged patients with spatial neglect and contralesional left tactile extinction or somatosensory deficits, and eight neurologically unimpaired participants, performed a speeded detection task on single taps delivered on their left index finger. In patients, placing the left hand in the right (heteronymous) hemi-space resulted in faster reaction times (RTs) to tactile stimuli, compared to placing that hand in the left (homonymous) hemi-space, particularly when the hand was visible. By contrast, in controls placing the left hand in the heteronymous hemi-space increased RTs. (2) Somatosensory event-related potentials were recorded from one patient and two controls in response to the stimulation of the left hand, placed in the two spatial positions. In the patient, the somatosensory P70, N140, and N250 components were enhanced when the left hand was placed in the heteronymous hemi-space, whereas in controls these components were not modulated by hand position. The novel findings are that in patients placing the left hand in the right, ipsilesional hemi-space yields a temporal advantage in processing tactile stimuli, and this effect may rely on a modulation of stimulus processing taking place as early as in the primary somatosensory cortex, as indexed by evoked potentials. Furthermore, vision enhances tactile processing specifically when the left hand is placed in the hemi-space towards which the patients’ attentional biases are pathologically directed, namely rightwards. |
topic |
Attention multisensory space ERPs hand crossing tactile extinction |
url |
http://journal.frontiersin.org/Journal/10.3389/fnhum.2012.00217/full |
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