期刊
BRAIN AND LANGUAGE
卷 148, 期 -, 页码 37-50出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bandl.2015.03.003
关键词
Averaged evoked potential; Classification analysis; Electrocorticography; Speech; Superior temporal gyrus
资金
- NIH [R01-DC04290, R01-DC00657, R01-DC008089, UL1RR024979]
- Hearing Health Foundation
- Hoover Fund
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 gyms (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. (C) 2015 Elsevier Inc. All rights reserved.
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