Intracranial Study of Speech-Elicited Activity on the Human Posterolateral Superior Temporal Gyrus

Mitchell Steinschneider; Kirill V Nourski; Hiroto Kawasaki; Hiroyuki Oya; John F Brugge; Matthew A Howard

doi:10.1093/cercor/bhr014

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Intracranial Study of Speech-Elicited Activity on the Human Posterolateral Superior Temporal Gyrus

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Intracranial Study of Speech-Elicited Activity on the Human Posterolateral Superior Temporal Gyrus

Mitchell Steinschneider, Kirill V Nourski, Hiroto Kawasaki, Hiroyuki Oya, John F Brugge and Matthew A Howard

Cerebral cortex (New York, N.Y. 1991), Vol.21(10), pp.2332-2347

10/2011

DOI: 10.1093/cercor/bhr014

PMCID: PMC3169661

PMID: 21368087

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Abstract

To clarify speech-elicited response patterns within auditory-responsive cortex of the posterolateral superior temporal (PLST) gyrus, time–frequency analyses of event-related band power in the high gamma frequency range (75–175 Hz) were performed on the electrocorticograms recorded from high-density subdural grid electrodes in 8 patients undergoing evaluation for medically intractable epilepsy. Stimuli were 6 stop consonant–vowel (CV) syllables that varied in their consonant place of articulation (POA) and voice onset time (VOT). Initial augmentation was maximal over several centimeters of PLST, lasted about 400 ms, and was often followed by suppression and a local outward expansion of activation. Maximal gamma power overlapped either the Nα or Pβ deflections of the average evoked potential (AEP). Correlations were observed between the relative magnitudes of gamma band responses elicited by unvoiced stop CV syllables (/pa/, /ka/, /ta/) and their corresponding voiced stop CV syllables (/ba/, /ga/, /da/), as well as by the VOT of the stimuli. VOT was also represented in the temporal patterns of the AEP. These findings, obtained in the passive awake state, indicate that PLST discriminates acoustic features associated with POA and VOT and serve as a benchmark upon which task-related speech activity can be compared.

electrocorticogram

place of articulation

average evoked potentials

voice onset time

gamma oscillations

Details

Title: Subtitle: Intracranial Study of Speech-Elicited Activity on the Human Posterolateral Superior Temporal Gyrus
Creators: Mitchell Steinschneider - Department of Neurology
Kirill V Nourski - Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA
Hiroto Kawasaki - Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA
Hiroyuki Oya - Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA
John F Brugge - Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA
Matthew A Howard - Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA
Resource Type: Journal article
Publication Details: Cerebral cortex (New York, N.Y. 1991), Vol.21(10), pp.2332-2347
Publisher: Oxford University Press
DOI: 10.1093/cercor/bhr014
PMID: 21368087
PMCID: PMC3169661
ISSN: 1047-3211
eISSN: 1460-2199
Language: English
Date published: 10/2011
Academic Unit: Neurology; Iowa Neuroscience Institute; Neurosurgery; Otolaryngology
Record Identifier: 9984016339102771

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