Spatiotemporal Dynamics of the Cortical Responses Induced by a Prolonged Tactile Stimulation of the Human Fingertips

Brain Topography
Clara GennaSilvestro Micera

Abstract

The sense of touch is fundamental for daily behavior. The aim of this work is to understand the neural network responsible for touch processing during a prolonged tactile stimulation, delivered by means of a mechatronic platform by passively sliding a ridged surface under the subject's fingertip while recording the electroencephalogram (EEG). We then analyzed: (i) the temporal features of the Somatosensory Evoked Potentials and their topographical distribution bilaterally across the cortex; (ii) the associated temporal modulation of the EEG frequency bands. Long-latency SEP were identified with the following physiological sequence P100-N140-P240. P100 and N140 were bilateral potentials with higher amplitude in the contralateral hemisphere and with delayed latency in the ipsilateral side. Moreover, we found a late potential elicited around 200 ms after the stimulation was stopped, which likely encoded the end of tactile input. The analysis of cortical oscillations indicated an initial increase in the power of theta band (4-7 Hz) for 500 ms after the stimulus onset followed a decrease in the power of the alpha band (8-15 Hz) that lasted for the remainder of stimulation. This decrease was prominent in the somatosensory cortex and ...Continue Reading

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Citations

Jul 26, 2019·The Journal of Physiology·Anders WahlbomHenrik Jörntell
Aug 15, 2017·Frontiers in Human Neuroscience·Chiara FanciullacciCarmelo Chisari
Jan 31, 2018·Frontiers in Human Neuroscience·Fiorenzo ArtoniFranco Molteni
Jun 14, 2019·Frontiers in Neurorobotics·Wanjoo ParkMohamad Eid
Apr 30, 2019·Frontiers in Cellular Neuroscience·Jonas M D EnanderHenrik Jörntell

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