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J Neurophysiol. 2009 Jul;102(1):377-86. doi: 10.1152/jn.90954.2008. Epub 2009 May 13.

Comparison of time-frequency responses and the event-related potential to auditory speech stimuli in human cortex.

Author information

1
Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA, USA. erik@socrates.berkeley.edu

Abstract

We recorded the electrocorticogram directly from the exposed cortical surface of awake neurosurgical patients during the presentation of auditory syllable stimuli. All patients were unanesthetized as part of a language-mapping procedure for subsequent left-hemisphere tumor resection. Time-frequency analyses showed significant high-gamma (gammahigh: 70-160 Hz) responses from the left superior temporal gyrus, but no reliable response from the left inferior frontal gyrus. Alpha suppression (alpha: 7-14 Hz) and event-related potential responses exhibited a more widespread topography. Across electrodes, the alpha suppression from 200 to 450 ms correlated with the preceding (50-200 ms) gammahigh increase. The results are discussed in terms of the different physiological origins of these electrocortical signals.

PMID:
19439673
PMCID:
PMC2712274
DOI:
10.1152/jn.90954.2008
[Indexed for MEDLINE]
Free PMC Article

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