Reference code: | PT/FB/BL-2020-311.03 |
Location: | BF-GMS
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Title:
| Tonic somatosensory responses and deficits of tactile awareness converge in the parietal operculum
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Publication year: | 2021
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URL:
| https://academic.oup.com/brain/article/144/12/3779/6388034
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Abstract/Results: | ABSTRACT:
Although clinical neuroscience and the neuroscience of consciousness have long sought mechanistic explanations of tactile-awareness disorders, mechanistic insights are rare, mainly because of the difficulty of depicting the fine-grained neural dynamics underlying somatosensory processes.
Here, we combined the stereo-EEG responses to somatosensory stimulation with the lesion mapping of patients with a tactile-awareness disorder, namely tactile extinction.
Whereas stereo-EEG responses present different temporal patterns, including early/phasic and long-lasting/tonic activities, tactile-extinction lesion mapping co-localizes only with the latter. Overlaps are limited to the posterior part of the perisylvian regions, suggesting that tonic activities may play a role in sustaining tactile awareness. To assess this hypothesis further, we correlated the prevalence of tonic responses with the tactile-extinction lesion mapping, showing that they follow the same topographical gradient. Finally, in parallel with the notion that visuotactile stimulation improves detection in tactile-extinction patients, we demonstrated an enhancement of tonic responses to visuotactile stimuli, with a strong voxel-wise correlation with the lesion mapping.
The combination of these results establishes tonic responses in the parietal operculum as the ideal neural correlate of tactile awareness.
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Accessibility: | Document exists in file
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Language:
| eng
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Author:
| Del Vecchio, M.
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Secondary author(s):
| Fossataro, C., Zauli, F. M., Sartori, I., Pigorini, A., d'Orio, P., Abarrategui, B., Russo, S., Mikulan, E. P., Caruana, F., Rizzolatti, G., Garbarini, F., Avanzini, P.
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Document type:
| Article
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Number of reproductions:
| 1
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Percentiles:
| 6
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Reference:
| Del Vecchio, M., Fossataro, C., Zauli, F. M., Sartori, I., Pigorini, A., d'Orio, P., Abarrategui, B., Russo, S., Mikulan, E. P., Caruana, F., Rizzolatti, G., Garbarini, F., & Avanzini, P. (2021). Tonic somatosensory responses and deficits of tactile awareness converge in the parietal operculum. Brain, 144(12), 3779–3787. https://doi.org/10.1093/brain/awab384
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2-year Impact Factor: | 15.255|2021
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Times cited: | 6|2024-02-14
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Indexed document: | Yes
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Quartile: | Q1
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Keywords: | Tactile extinction / Conscious perception / Perisylvian / Late responses / Brain lesions
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Tonic somatosensory responses and deficits of tactile awareness converge in the parietal operculum |