Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence
Identifieur interne : 001D26 ( Pmc/Corpus ); précédent : 001D25; suivant : 001D27Visual and spatial modulation of tactile extinction: behavioural and electrophysiological evidence
Auteurs : Chiara F. Sambo ; Giuseppe Vallar ; Paola Fortis ; Roberta Ronchi ; Lucio Posteraro ; Bettina Forster ; Angelo MaravitaSource :
- Frontiers in Human Neuroscience [ 1662-5161 ] ; 2012.
Abstract
Crossing the hands over the midline reduces left tactile extinction to double simultaneous stimulation in right-brain-damaged patients, suggesting that spatial attentional biases toward 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 (ERPs) 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
Url:
DOI: 10.3389/fnhum.2012.00217
PubMed: 22848197
PubMed Central: 3404548
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