Conditioning transcutaneous electrical nerve stimulation induces delayed gating effects on cortical response: a magnetoencephalographic study.
作者： K. Torquati , R. Franciotti , S. Della Penna , C. Babiloni , P.M. Rossini
DOI: 10.1016/J.NEUROIMAGE.2006.12.047
关键词:
摘要: The present study was undertaken to investigate after-effects of 7 Hz non-painful prolonged stimulation the median nerve on somatosensory-evoked fields (SEFs). working hypothesis that conditioning peripheral stimulations might produce delayed interfering ("gating") effects response somatosensory cortex test stimuli evaluated. In control condition, electrical thumb induced SEFs in ten subjects. experimental protocol, a at wrist preceded 6 stimulations. Equivalent current dipoles fitting modeled responses contralateral primary area (SI) and bilateral secondary areas (SII) following conditions. Compared no amplitude modulation SI initial stimulus-related peak (20 ms). contrast, later from (35 ms) SII were significantly weakened amplitude. Gradual but fast recovery towards levels observed for SI-P35, while slightly slower cycle featured SII. These findings point "gating" effect synchronization after This found be more lasting area, as possible reflection its integrative role sensory processing.
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