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Hippocampal and auditory contributions to speech segmentation.

Neus Ramos-Escobar1, Manuel Mercier2, Agnès Trébuchon-Fonséca3

  • 1Department of Cognition, Development and Educational Science, Institute of Neuroscience, University of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain; Cognition and Brain Plasticity Group, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona, Spain.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 19, 2022
PubMed
Summary

The hippocampus plays a key role in speech segmentation by processing word frequency, not just syllable frequency. This finding suggests a hierarchical organization in auditory processing for speech segmentation.

Keywords:
Frequency taggingHippocampusSEEGSpeech segmentationStatistical learning

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Perception

Background:

  • Statistical learning structures sensory information, with the medial temporal lobe and hippocampus implicated in visual stream parsing.
  • The hippocampus's role in auditory statistical learning and speech segmentation remains less understood.

Purpose of the Study:

  • To investigate the hippocampus's involvement in speech segmentation using statistical learning.
  • To explore the neural mechanisms underlying auditory statistical learning and speech processing.

Main Methods:

  • Utilized intracranial stereotaxic electro-encephalography (sEEG) in seven epilepsy patients exposed to continuous speech streams.
  • Employed frequency-tagging analysis to measure hippocampal and auditory region synchronization to word and syllable structures.
  • Analyzed event-related potentials (ERPs) to assess recognition of segmented words.

Main Results:

  • Auditory regions synchronized strongly with syllable frequency, while the hippocampus showed greater synchronization with word frequency.
  • Hippocampal ERPs demonstrated sensitivity to the familiarity of segmented speech items.
  • Direct evidence implicates the hippocampus in speech segmentation.

Conclusions:

  • The hippocampus is involved in speech segmentation, processing information hierarchically.
  • Findings suggest a division of labor between auditory regions and the hippocampus in processing auditory statistical learning and speech segmentation.