Modulation of somatosensory evoked magnetic fields by intensity of interfering stimuli in human somatosensory cortex: an MEG study.
作者： Manyoel Lim , June Sic Kim , Chun Kee Chung , None
DOI: 10.1016/J.NEUROIMAGE.2012.04.003
关键词: Somatosensory evoked magnetic fields 、 Amplitude 、 Magnetic resonance imaging 、 Psychology 、 Somatosensory evoked potential 、 Stimulus (physiology) 、 Neuroscience 、 Magnetoencephalography 、 Somatosensory system 、 Gating
摘要: Somatosensory evoked responses are known to be modulated by previous interfering stimuli. Here, we first investigated the modulatory effects of stimuli with different intensities on somatosensory magnetic field in human primary (S1) and secondary (S2) cortices. In control condition study, test stimulus, set strong intensity, was delivered left median nerve. Interfering three levels intensity from weak (WI) through moderate (MI) finally (SI) were interspersed nerve between each condition. The cortical stimulus modeled equivalent current dipoles contralateral S1 bilateral S2 cortices 17 subjects. amplitude N20m deflection not changed any stimuli, whereas later P35m reduced MI stimulus. P60m SI extent reduction response markedly increased as moderate, but further compared observed. Those results indicated that activation (P35m P60m) Our findings a greater gating effect indicate may play an important role temporal integration inputs.
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