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Cortical Representation of Speech Sounds: Insights from Intracranial Electrophysiology

Intracranial Electrophysiology of Speech Sound Processing

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Speech Perception

Part of the book series: Springer Handbook of Auditory Research ((SHAR,volume 74))

Abstract

The superior temporal gyrus (STG) has long been recognized as crucial to the human ability to perceive and comprehend spoken language. However, the nature of the neuronal computations and cortical representations responsible for this sensory and cognitive feat remain a mystery. The recent advance of methodologies for intracranial electrophysiology (iEEG) recordings, together with the emergence of novel computational approaches, have heralded progress toward understanding how neural processing in auditory cortex gives rise to the perceptual experience of speech. This chapter describes a collection of intracranial neurophysiology studies that illustrate two fundamental properties of STG encoding of speech sounds. First, this neural representation of speech is firmly rooted in the analysis of high-order acoustic features in the sensory stimulus. Second, the neural representation also differs dramatically from a linear representation of sound acoustics. The STG encodes an imperfect spectrotemporal representation of speech, sacrificing faithfulness to the sensory signal where it enhances the robust encoding of linguistically and behaviorally relevant information. Besides being insensitive to behaviorally irrelevant information carried by the speech signal, STG is also sensitive to behaviorally relevant information not contained within the speech signal (i.e., top-down cues). Overall, mounting evidence suggests that STG is a sensory-perceptual hub for the human speech perception system, functionally characterized by the behaviorally relevant cortical representation of speech that emerges therein.

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  • Neal P. Fox declares that he has no conflicts of interest.

  • Yulia Oganian declares that she has no conflicts of interest.

  • Edward F. Chang declares that he has no conflicts of interest.

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Correspondence to Edward F. Chang .

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Oganian, Y., Fox, N.P., Chang, E.F. (2022). Cortical Representation of Speech Sounds: Insights from Intracranial Electrophysiology. In: Holt, L.L., Peelle, J.E., Coffin, A.B., Popper, A.N., Fay, R.R. (eds) Speech Perception. Springer Handbook of Auditory Research, vol 74. Springer, Cham. https://doi.org/10.1007/978-3-030-81542-4_3

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