title: Sound identification in human auditory cortex: Differential contribution of local field potentials and high gamma power as revealed by direct intracranial recordings.
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.
authors.affiliation: Department of Neurosurgery, The University of Iowa, Iowa City, IA 52242, USA. Electronic address: kirill-nourski@uiowa.edu.
authors.forename: Kirill V
authors.initials: KV
authors.lastname: Nourski
authors.affiliation: Department of Neurology, Albert Einstein College of Medicine, New York, NY 10461, USA; Department of Neuroscience, Albert Einstein College of Medicine, New York, NY 10461, USA.
authors.forename: Mitchell
authors.initials: M
authors.lastname: Steinschneider
authors.affiliation: Department of Neurosurgery, The University of Iowa, Iowa City, IA 52242, USA.
authors.forename: Ariane E
authors.initials: AE
authors.lastname: Rhone
authors.affiliation: Department of Neurosurgery, The University of Iowa, Iowa City, IA 52242, USA.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Oya
authors.affiliation: Department of Neurosurgery, The University of Iowa, Iowa City, IA 52242, USA.
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kawasaki
authors.affiliation: Department of Neurosurgery, The University of Iowa, Iowa City, IA 52242, USA.
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Howard
authors.affiliation: Department of Psychology, The University of Iowa, Iowa City, IA 52242, USA; Department of Communication Sciences and Disorders, The University of Iowa, Iowa City, IA 52242, USA; Department of Linguistics, The University of Iowa, Iowa City, IA 52242, USA.
authors.forename: Bob
authors.initials: B
authors.lastname: McMurray
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D000069279:Drug Resistant Epilepsy; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013016:Sound; D013702:Temporal Lobe / Q000502:physiology; D014831:Voice; D055815:Young Adult
keywords: Averaged evoked potential; Classification analysis; Electrocorticography; Speech; Superior temporal gyrus
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