Presurgical language mapping using event-related high-gamma activity: The Detroit procedure

Toshimune Kambara, Sandeep Sood, Zahraa Alqatan, Christine Klingert, Diksha Ratnam, Akane Hayakawa, Yasuo Nakai, Aimee F. Luat, Rajkumar Agarwal, Robert Rothermel, Eishi Asano

Research output: Contribution to journalReview articlepeer-review

24 Scopus citations


A number of investigators have reported that event-related augmentation of high-gamma activity at 70–110 Hz on electrocorticography (ECoG) can localize functionally-important brain regions in children and adults who undergo epilepsy surgery. The advantages of ECoG-based language mapping over the gold-standard stimulation include: (i) lack of stimulation-induced seizures, (ii) better sensitivity of localization of language areas in young children, and (iii) shorter patient participant time. Despite its potential utility, ECoG-based language mapping is far less commonly practiced than stimulation mapping. Here, we have provided video presentations to explain, point-by-point, our own hardware setting and time–frequency analysis procedures. We also have provided standardized auditory stimuli, in multiple languages, ready to be used for ECoG-based language mapping. Finally, we discussed the technical aspects of ECoG-based mapping, including its pitfalls, to facilitate appropriate interpretation of the data.

Original languageEnglish
Pages (from-to)145-154
Number of pages10
JournalClinical Neurophysiology
Issue number1
StatePublished - Jan 2018


  • Articulation
  • Artifacts
  • Auditory and visual perception
  • Eloquent areas
  • High-frequency oscillations (HFOs)
  • Intracranial electrocorticography (ECoG) recording
  • Language
  • Pediatric epilepsy surgery
  • Ripples
  • Speech
  • Subdural electroencephalography (EEG)
  • Vocalization


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