The Tracking of Speech Envelope in the Human Cortex

Jan Kubanek, Peter Brunner, Aysegul Gunduz, David Poeppel, Gerwin Schalk

Research output: Contribution to journalArticle

Abstract

Humans are highly adept at processing speech. Recently, it has been shown that slow temporal information in speech (i.e., the envelope of speech) is critical for speech comprehension. Furthermore, it has been found that evoked electric potentials in human cortex are correlated with the speech envelope. However, it has been unclear whether this essential linguistic feature is encoded differentially in specific regions, or whether it is represented throughout the auditory system. To answer this question, we recorded neural data with high temporal resolution directly from the cortex while human subjects listened to a spoken story. We found that the gamma activity in human auditory cortex robustly tracks the speech envelope. The effect is so marked that it is observed during a single presentation of the spoken story to each subject. The effect is stronger in regions situated relatively early in the auditory pathway (belt areas) compared to other regions involved in speech processing, including the superior temporal gyrus (STG) and the posterior inferior frontal gyrus (Broca's region). To further distinguish whether speech envelope is encoded in the auditory system as a phonological (speech-related), or instead as a more general acoustic feature, we also probed the auditory system with a melodic stimulus. We found that belt areas track melody envelope weakly, and as the only region considered. Together, our data provide the first direct electrophysiological evidence that the envelope of speech is robustly tracked in non-primary auditory cortex (belt areas in particular), and suggest that the considered higher-order regions (STG and Broca's region) partake in a more abstract linguistic analysis.

Original languageEnglish (US)
Article numbere53398
JournalPLoS One
Volume8
Issue number1
DOIs
StatePublished - Jan 17 2013

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cortex
Speech processing
Auditory Cortex
Linguistics
Temporal Lobe
Auditory Pathways
Prefrontal Cortex
Evoked Potentials
Acoustics
Human Activities
acoustics
Electric potential

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Kubanek, J., Brunner, P., Gunduz, A., Poeppel, D., & Schalk, G. (2013). The Tracking of Speech Envelope in the Human Cortex. PLoS One, 8(1), [e53398]. https://doi.org/10.1371/journal.pone.0053398

The Tracking of Speech Envelope in the Human Cortex. / Kubanek, Jan; Brunner, Peter; Gunduz, Aysegul; Poeppel, David; Schalk, Gerwin.

In: PLoS One, Vol. 8, No. 1, e53398, 17.01.2013.

Research output: Contribution to journalArticle

Kubanek, J, Brunner, P, Gunduz, A, Poeppel, D & Schalk, G 2013, 'The Tracking of Speech Envelope in the Human Cortex', PLoS One, vol. 8, no. 1, e53398. https://doi.org/10.1371/journal.pone.0053398
Kubanek, Jan ; Brunner, Peter ; Gunduz, Aysegul ; Poeppel, David ; Schalk, Gerwin. / The Tracking of Speech Envelope in the Human Cortex. In: PLoS One. 2013 ; Vol. 8, No. 1.
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