2026-04-29T01:00:09Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/232132024-11-29T07:18:57Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16967

00925njm 22002777a 4500 dc Montoro, Casandra, I author Winterholler, Christine author Terrasa, Juan L author Montoya, Pedro author 2021-09-07 Background: Anodal transcranial direct current stimulation (tDCS) of the somatosensory cortex causes cerebral hyperexcitability and a significant enhancement in pain thresholds and tactile spatial acuity. Sensory gating is a brain mechanism to suppress irrelevant incoming inputs, which is elicited by presenting pairs of identical stimuli (S1 and S2) within short time intervals between stimuli (e.g., 500 ms). Objectives/Hypothesis: The present study addressed the question of whether tDCS could modulate the brain correlates of this inhibitory mechanism. Methods: Forty-one healthy individuals aged 18-26 years participated in the study and were randomly assigned to tDCS (n = 21) or SHAM (n = 20). Somatosensory evoked potentials (SEP) elicited by S1 and S2 pneumatic stimuli (duration of 100 ms, ISI 550 +/- 50 ms) and applied to the index finger of the dominant hand were recorded before and after tDCS. Results: Before the intervention, the second tactile stimuli significantly attenuated the amplitudes of P50, N100, and the late positive complex (LPC, mean amplitude in the time window 150-350) compared to the first stimuli. This confirmed that sensory gating is a widespread brain inhibitory mechanism that can affect early- and middle-latency components of SEPs. Furthermore, our data revealed that this response attenuation or sensory gating (computed as S1 minus S2) was improved after tDCS for LPC, while no changes were found in participants who received SHAM. Conclusion: All these findings suggested that anodal tDCS might modulate brain excitability leading to an enhancement of inhibitory mechanisms elicited in response to repetitive somatosensory stimuli during late stages of information processing. Montoro CI, Winterholler C, Terrasa JL, Montoya P. Somatosensory Gating Is Modulated by Anodal Transcranial Direct Current Stimulation. Front Neurosci. 2021 Sep 7;15:651253. https://hdl.handle.net/20.500.13003/19826 https://hdl.handle.net/20.500.12105/23213 34557064 10.3389/fnins.2021.651253 1662-453X Frontiers in Neuroscience 2-s2.0-85115360825 703266100001 L636019857 Late positive complex Cortical excitability Sensory gating Somatosensory cortex Transcranial direct current stimulation Somatosensory Gating Is Modulated by Anodal Transcranial Direct Current Stimulation