Laser evoked potential recording from intracerebral deep electrodes

Massimiliano Valeriani, Andrea Truini, Domenica Le Pera, Angelo Insola, Francesca Galeotti, Corrado Petrachi, Paolo Mazzone, Giorgio Cruccu

Research output: Contribution to journalArticlepeer-review


Objective: To investigate whether recording from deep intracerebral (IC) electrodes can disclose laser evoked potential (LEP) components generated under the cerebral cortex. Methods: LEPs were recorded to hand and/or perioral region stimulation from 7 patients suffering from Parkinson's disease, who underwent implant of IC electrodes in the globus pallidum pars interna (GPi), in the subthalamic nucleus (STN) and in the pedunculopontine nucleus (PPN). LEPs were obtained from the IC electrode contacts and from the Cz vertex, referred to the nose. Results: The scalp traces showed a triphasic response (P1-N2-P2). The IC electrodes recorded two main components (ICP2 and ICN2), showing the same latencies as the scalp N2 and P2 potentials, respectively. The ICP2-ICN2 complex was sometimes preceded by a ICP1 wave at the same latency of the scalp P1 response. Conclusions: The LEP components recorded from the IC electrodes mirrored the ones picked up from the Cz lead, thus suggesting that they are probably generated by the opposite pole of the same cortical sources producing the scalp responses. Significance: In the IC traces, there was no evidence of earlier potentials possibly generated within the thalamus or of subcortical far-field responses. This means that the nociceptive signal amplification occurring within the cerebral cortex is necessary to produce identifiable LEP components.

Original languageEnglish
Pages (from-to)790-795
Number of pages6
JournalClinical Neurophysiology
Issue number4
Publication statusPublished - Apr 2009


  • Cingulate gyrus
  • Deep brain stimulation
  • Globus pallidum
  • Laser evoked potential
  • Thalamus

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology
  • Physiology (medical)
  • Sensory Systems


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