Passive real-time identification of speech and motor cortex during an awake craniotomy

Jarod Roland, Peter Brunner, James Johnston, Gerwin Schalk, Eric C. Leuthardt

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


Precise localization of eloquent cortex is a clinical necessity prior to surgical resections adjacent to speech or motor cortex. In the intraoperative setting, this traditionally requires inducing temporary lesions by direct electrocortical stimulation (DECS). In an attempt to increase efficiency and potentially reduce the amount of necessary stimulation, we used a passive mapping procedure in the setting of an awake craniotomy for tumor in two patients resection. We recorded electrocorticographic (ECoG) signals from exposed cortex while patients performed simple cue-directed motor and speech tasks. SIGFRIED, a procedure for real-time event detection, was used to identify areas of cortical activation by detecting task-related modulations in the ECoG high gamma band. SIGFRIED's real-time output quickly localized motor and speech areas of cortex similar to those identified by DECS. In conclusion, real-time passive identification of cortical function using SIGFRIED may serve as a useful adjunct to cortical stimulation mapping in the intraoperative setting.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalEpilepsy and Behavior
Issue number1-2
StatePublished - May 2010


  • Awake craniotomy
  • Brain mapping
  • Cortex
  • Electrocorticography
  • Speech


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