Parieto-motor cortical dysfunction in primary cervical dystonia

Paolo Porcacchia, Francisco J. Palomar, María T. Cáceres-Redondo, Ismael Huertas-Fernández, Juan F. Martín-Rodríguez, Fátima Carrillo, Giacomo Koch, Pablo Mir

Research output: Contribution to journalArticle

Abstract

Background: Dystonia is considered as a motor network disorder involving the dysfunction of the posterior parietal cortex, a region involved in preparing and executing reaching movements.

Objective/hypothesis: We used transcranial magnetic stimulation to test the hypothesis that cervical dystonic patients may have a disrupted parieto-motor connectivity.

Methods: We enrolled 14 patients with primary cervical dystonia and 14 controls. A paired-pulse transcranial magnetic stimulation protocol was applied over the right posterior parietal cortex and the right primary motor area. Changes in the amplitudes of motor evoked potential were analyzed as an index of parieto-motor effective connectivity. Patients and healthy subjects were also evaluated with a reaching task. Reaction and movement times were measured.

Results: In healthy subjects, but not in dystonic patients, there was a facilitation of motor evoked potential amplitudes when the conditioning parietal stimulus preceded the test stimulus applied over the primary motor area by 4 ms. Reaction and movement times were significantly slower in patients than in controls. In dystonic patients, the relative strength of parieto-motor connectivity correlated with movement times.

Conclusions: Parieto-motor cortical connectivity is impaired in cervical dystonic patients. This neurophysiological trait is associated with slower reaching movements.

Original languageEnglish
Pages (from-to)650-657
Number of pages8
JournalBrain Stimulation
Volume7
Issue number5
DOIs
Publication statusPublished - Sep 1 2014

Keywords

  • Dystonia
  • Hypokinesia
  • Parietal lobe
  • Transcranial magnetic stimulation

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)
  • Biophysics
  • Medicine(all)

Fingerprint Dive into the research topics of 'Parieto-motor cortical dysfunction in primary cervical dystonia'. Together they form a unique fingerprint.

  • Cite this

    Porcacchia, P., Palomar, F. J., Cáceres-Redondo, M. T., Huertas-Fernández, I., Martín-Rodríguez, J. F., Carrillo, F., Koch, G., & Mir, P. (2014). Parieto-motor cortical dysfunction in primary cervical dystonia. Brain Stimulation, 7(5), 650-657. https://doi.org/10.1016/j.brs.2014.06.007