Somatosensory evoked potentials during the ideation and execution of individual finger movements

Paolo M. Rossini, Donatella Caramia, Maria A. Bassetti, Patrizio Pasqualetti, Franca Tecchio, Giorgio Bernardi

Research output: Contribution to journalArticlepeer-review


Scalp somatosensory evoked potentials (SEPs) were recorded in 10 volunteers after median nerve stimulation, in four experimental conditions of hand movements performance/ideation, and compared with the baseline condition of full relaxation. The experimental conditions were (a) self-improvised hand-finger sequential movements; (b) the same movements according to a read sequence of numbers; (c) mental ideation of finger movements; and (d) passive displacement of fingers in complete relaxation. Latencies and amplitudes of the parietal (N20, P25, N33, and P45) and frontal peaks (P20-22, N30, and P40) were analyzed. Latencies did not vary in any of the paradigms. Among the parietal complexes, only the P25-N33 amplitude was significantly reduced in (a), (b), (c), and (d) and the N20-P25 was reduced in (a) and (d); among frontal waves, N30 and P40 were significantly reduced (2075%) in (a) and (b). Coronal electrodes showed amplitude decrements maximal at the frontal- rolandic positions contralateral to the stimulated side.

Original languageEnglish
Pages (from-to)191-202
Number of pages12
JournalMuscle and Nerve
Issue number2
Publication statusPublished - Feb 1996


  • finger movements
  • median nerve stimulation
  • sensory 'gating'
  • SEPs

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)


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