Journal article
Temporal Envelope of Time-Compressed Speech Represented in the Human Auditory Cortex
The Journal of neuroscience, Vol.29(49), pp.15564-15574
12/09/2009
DOI: 10.1523/JNEUROSCI.3065-09.2009
PMCID: PMC2851231
PMID: 20007480
Abstract
Speech comprehension relies on temporal cues contained in the speech envelope, and the auditory cortex has been implicated as playing a critical role in encoding this temporal information. We investigated auditory cortical responses to speech stimuli in subjects undergoing invasive electrophysiological monitoring for pharmacologically refractory epilepsy. Recordings were made from multicontact electrodes implanted in Heschl's gyrus (HG). Speech sentences, time compressed from 0.75 to 0.20 of natural speaking rate, elicited average evoked potentials (AEPs) and increases in event-related band power (ERBP) of cortical high-frequency (70–250 Hz) activity. Cortex of posteromedial HG, the presumed core of human auditory cortex, represented the envelope of speech stimuli in the AEP and ERBP. Envelope following in ERBP, but not in AEP, was evident in both language-dominant and -nondominant hemispheres for relatively high degrees of compression where speech was not comprehensible. Compared to posteromedial HG, responses from anterolateral HG—an auditory belt field—exhibited longer latencies, lower amplitudes, and little or no time locking to the speech envelope. The ability of the core auditory cortex to follow the temporal speech envelope over a wide range of speaking rates leads us to conclude that such capacity in itself is not a limiting factor for speech comprehension.
Details
- Title: Subtitle
- Temporal Envelope of Time-Compressed Speech Represented in the Human Auditory Cortex
- Creators
- Kirill V Nourski - Departments of Neurosurgery andRichard A Reale - Departments of Neurosurgery andHiroyuki Oya - Departments of Neurosurgery andHiroto Kawasaki - Departments of Neurosurgery andChristopher K Kovach - Neurology, The University of Iowa, Iowa City, Iowa 52242Haiming Chen - Departments of Neurosurgery andMatthew A Howard III - Departments of Neurosurgery andJohn F Brugge - Departments of Neurosurgery and
- Resource Type
- Journal article
- Publication Details
- The Journal of neuroscience, Vol.29(49), pp.15564-15574
- Publisher
- Society for Neuroscience
- DOI
- 10.1523/JNEUROSCI.3065-09.2009
- PMID
- 20007480
- PMCID
- PMC2851231
- ISSN
- 0270-6474
- eISSN
- 1529-2401
- Language
- English
- Date published
- 12/09/2009
- Academic Unit
- Neurology; Iowa Neuroscience Institute; Neurosurgery; Otolaryngology
- Record Identifier
- 9984013918102771
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