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Related Experiment Videos

Prosodic characteristics of speech pre- and post-right hemisphere stroke

L X Blonder1, J E Pickering, R L Heath

  • 1Department of Behavioral Science, University of Kentucky, Lexington 40536-0230, USA.

Brain and Language
|November 1, 1995
PubMed
Summary

Right hemisphere damage impairs speech prosody, affecting intonation and emotional expression. This study details how a stroke impacted one patient's vocal pitch and speech patterns, revealing significant changes in prosodic features.

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Area of Science:

  • Neurolinguistics
  • Cognitive Neuroscience
  • Speech Science

Background:

  • Right hemisphere dominance for prosody production is suggested by prior case-control studies.
  • Prosody, encompassing intonation and emotional tone, is crucial for effective communication.

Observation:

  • A 77-year-old right-handed woman was studied before and after a stroke affecting right frontotemporoparietal regions and basal ganglia.
  • Post-stroke, the patient exhibited hemispatial neglect and deficits in facial expression and prosody comprehension, despite a normal Mini-Mental Status Examination score.

Findings:

  • The patient demonstrated a reduced fundamental frequency (fo) contour and an increased speech rate post-stroke.
  • Variability in pause duration decreased, while breath-group duration and the timing of peak fo remained unchanged.

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Implications:

  • Findings support the role of the right hemisphere in producing spontaneous speech prosody.
  • This case highlights the specific prosodic alterations following right-sided brain injury, impacting communication beyond literal content.