Ipsilateral primary sensorimotor cortical response to mechanical tactile stimuli

Abstract

We studied somatosensory-evoked fields elicited by mechanical versus electrical stimuli to index finger of healthy participants. Mechanical stimulation was index pulp compression and decompression by using nonmagnetic mechanical stimulator. Electrical stimulation was three times of sensory threshold and delivered to index pulp by using ball-shaped electrodes. Mechanical/electrical stimuli evoked contralateral primary somatosensory cortical responses in all respective participants. Compressive stimuli evoked ipsilateral primary sensorimotor cortical responses in all respective participants, with dipole strengths less than contralateral primary somatosensory cortical responses of compressive stimuli. Mechanical/electrical stimuli evoked secondary somatosensory (SII) cortical responses bilaterally; electrical-stimuli SII dipole strengths were relatively stronger than compressive-stimuli SII responses. It is concluded that the use of mechanical stimulation may improve our understanding of functional sensory cortical responses compared with electrical stimulation.

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“…In a recent experiment, SEFs were actuated by mechanical versus electrical stimulation of an index finger from human subjects in order to objectively establish the existence of compressive/decompressive stimuli-related SEFs [20]. Mechanical stimulation was administered to the index-pulp of each subject utilizing a nonmagnetic mechanical stimulator applied at 3 times the sensory-threshold.…”

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“…There have been several SEF studies using mechanical stimuli (MS), e.g., air puffs (pneumatic stimulation) [39][40][41][42][43][44][45][46][47][48][49][50][51][52] , brushes [53][54][55] , plastic pieces driven by airflow 56) , and vibration buzzers 57) . Pneumatic stimulation is a useful tool to of the activities in the SMA, PPC, and S2 accompanying passive movement in humans were successfully recorded using MEG with a multiple dipole analysis system.…”