Research on the cortical sources of nociceptive laser-evoked brain potentials (LEPs) began almost two decades ago (Tarkka and Treede, 1993). Whereas there is a large consensus on the sources of the late part of the LEP waveform (N2 and P2 waves), the relative contribution of the primary somatosensory cortex (S1) to the early part of the LEP waveform (N1 wave) is still debated. To address this issue we recorded LEPs elicited by the stimulation of four limbs in a large population (n = 35). Early LEP generators were estimated both at single-subject and group level, using three different approaches: distributed source analysis, dipolar source modeling, and probabilistic independent component analysis (ICA).We show that the scalp distribution of the earliest LEP response to hand stimulation was maximal over the central-parietal electrodes contralateral to the stimulated side, while that of the earliest LEP response to foot stimulation was maximal over the central-parietal midline electrodes. Crucially, all three approaches indicated hand and foot S1 areas as generators of the earliest LEP response. Altogether, these findings indicate that the earliest part of the scalp response elicited by a selective nociceptive stimulus is largely explained by activity in the contralateral S1, with negligible contribution from the secondary somatosensory cortex (S2). © 2011 Elsevier Inc.

The primary somatosensory cortex largely contributes to the early part of the cortical response elicited by nociceptive stimuli / Valentini, Elia; L., Hu; B., Chakrabarti; Y., Hu; Aglioti, Salvatore Maria; G. D., Iannetti. - In: NEUROIMAGE. - ISSN 1053-8119. - STAMPA. - 59:2(2012), pp. 1571-1581. [10.1016/j.neuroimage.2011.08.069]

The primary somatosensory cortex largely contributes to the early part of the cortical response elicited by nociceptive stimuli

VALENTINI, ELIA;AGLIOTI, Salvatore Maria;
2012

Abstract

Research on the cortical sources of nociceptive laser-evoked brain potentials (LEPs) began almost two decades ago (Tarkka and Treede, 1993). Whereas there is a large consensus on the sources of the late part of the LEP waveform (N2 and P2 waves), the relative contribution of the primary somatosensory cortex (S1) to the early part of the LEP waveform (N1 wave) is still debated. To address this issue we recorded LEPs elicited by the stimulation of four limbs in a large population (n = 35). Early LEP generators were estimated both at single-subject and group level, using three different approaches: distributed source analysis, dipolar source modeling, and probabilistic independent component analysis (ICA).We show that the scalp distribution of the earliest LEP response to hand stimulation was maximal over the central-parietal electrodes contralateral to the stimulated side, while that of the earliest LEP response to foot stimulation was maximal over the central-parietal midline electrodes. Crucially, all three approaches indicated hand and foot S1 areas as generators of the earliest LEP response. Altogether, these findings indicate that the earliest part of the scalp response elicited by a selective nociceptive stimulus is largely explained by activity in the contralateral S1, with negligible contribution from the secondary somatosensory cortex (S2). © 2011 Elsevier Inc.
2012
source analysis; nociception; primary somatosensory cortex; laser-evoked potentials (leps); postcentral gyrus
01 Pubblicazione su rivista::01a Articolo in rivista
The primary somatosensory cortex largely contributes to the early part of the cortical response elicited by nociceptive stimuli / Valentini, Elia; L., Hu; B., Chakrabarti; Y., Hu; Aglioti, Salvatore Maria; G. D., Iannetti. - In: NEUROIMAGE. - ISSN 1053-8119. - STAMPA. - 59:2(2012), pp. 1571-1581. [10.1016/j.neuroimage.2011.08.069]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/389519
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