Cortico-cortical networks in patients with ideomotor apraxia as revealed by EEG coherence analysis

Lewis A. Wheaton, Stephan Bohlhalter, Guido Nolte, Hiroshi Shibasaki, Noriaki Hattori, Esteban Fridman, Sherry Vorbach, Jordan Grafman, Mark Hallett*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We sought to determine whether coherent networks which circumvent lesioned cortex are seen in patients with ideomotor apraxia (IMA) while performing tool-use pantomimes. Five normal subjects and five patients with IMA (three patients with corticobasal degeneration and two with left hemisphere stroke) underwent 64-channel EEG recording while performing three tool-use pantomimes with their left hand in a self-paced manner. Beta band (20-22 Hz) coherence indicates that normal subjects have a dominant left hemisphere network responsible for praxis preparation, which was absent in patients. Corticobasal degeneration patients showed significant coherence increase between left parietal-right premotor areas. Left hemisphere stroke patients showed significant coherence increases in a right parietofrontal network. The right hemisphere appears to store useable praxis representations in IMA patients with left hemisphere damage.

Original languageEnglish (US)
Pages (from-to)87-92
Number of pages6
JournalNeuroscience Letters
Issue number2
StatePublished - Mar 12 2008


  • Coherence
  • Ideomotor apraxia
  • Parietal
  • Plasticity
  • Stroke

ASJC Scopus subject areas

  • Neuroscience(all)

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