Sound identification in human auditory cortex

Differential contribution of local field potentials and high gamma power as revealed by direct intracranial recordings

Kirill V. Nourski, Mitchell Steinschneider, Ariane E. Rhone, Hiroyuki Oya, Hiroto Kawasaki, Matthew A. Howard, Bob McMurray

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

High gamma power has become the principal means of assessing auditory cortical activation in human intracranial studies, albeit at the expense of low frequency local field potentials (LFPs). It is unclear whether limiting analyses to high gamma impedes ability of clarifying auditory cortical organization. We compared the two measures obtained from posterolateral superior temporal gyrus (PLST) and evaluated their relative utility in sound categorization. Subjects were neurosurgical patients undergoing invasive monitoring for medically refractory epilepsy. Stimuli (consonant-vowel syllables varying in voicing and place of articulation and control tones) elicited robust evoked potentials and high gamma activity on PLST. LFPs had greater across-subject variability, yet yielded higher classification accuracy, relative to high gamma power. Classification was enhanced by including temporal detail of LFPs and combining LFP and high gamma. We conclude that future studies should consider utilizing both LFP and high gamma when investigating the functional organization of human auditory cortex.

Original languageEnglish (US)
Pages (from-to)37-50
Number of pages14
JournalBrain and Language
Volume148
DOIs
StatePublished - Sep 1 2015

Fingerprint

Forensic Anthropology
Auditory Cortex
Temporal Lobe
recording
organization
epilepsy
Evoked Potentials
activation
Epilepsy
stimulus
monitoring
ability
Sound

Keywords

  • Averaged evoked potential
  • Classification analysis
  • Electrocorticography
  • Speech
  • Superior temporal gyrus

ASJC Scopus subject areas

  • Linguistics and Language
  • Speech and Hearing
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Language and Linguistics

Cite this

Sound identification in human auditory cortex : Differential contribution of local field potentials and high gamma power as revealed by direct intracranial recordings. / Nourski, Kirill V.; Steinschneider, Mitchell; Rhone, Ariane E.; Oya, Hiroyuki; Kawasaki, Hiroto; Howard, Matthew A.; McMurray, Bob.

In: Brain and Language, Vol. 148, 01.09.2015, p. 37-50.

Research output: Contribution to journalArticle

Nourski, Kirill V. ; Steinschneider, Mitchell ; Rhone, Ariane E. ; Oya, Hiroyuki ; Kawasaki, Hiroto ; Howard, Matthew A. ; McMurray, Bob. / Sound identification in human auditory cortex : Differential contribution of local field potentials and high gamma power as revealed by direct intracranial recordings. In: Brain and Language. 2015 ; Vol. 148. pp. 37-50.
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