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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Updated: Nov 15, 2025

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Published on: September 27, 2024

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[Foreign Accent Syndrome].

Yuichi Higashiyama1, Fumiaki Tanaka

  • 1Department of Neurology and Stroke Medicine, Yokohama City University Graduate School of Medicine.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|March 8, 2021
PubMed
Summary
This summary is machine-generated.

Foreign accent syndrome (FAS) causes a noticeable change in speech patterns, often perceived as a new accent. This rare neurological disorder results from phonetic and prosodic speech deficits, with stroke being the most common cause.

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Area of Science:

  • Neurology
  • Linguistics
  • Speech Pathology

Background:

  • Foreign accent syndrome (FAS) is a rare speech disorder where individuals develop an accent perceived as foreign.
  • Over a hundred cases have been documented, highlighting its unusual nature.
  • The perceived accent change is attributed to both phonetic distortions and variations in speech prosody.

Purpose of the Study:

  • To analyze the characteristics of foreign accent syndrome.
  • To investigate the underlying causes and neurological correlates of FAS.
  • To evaluate the consistency and validity of classifying FAS as a distinct syndrome.

Main Methods:

  • Review of reported cases of foreign accent syndrome.
  • Analysis of speech characteristics, including segmental and supra-segmental features.
  • Correlation of lesion locations in the brain with observed speech deficits.

Main Results:

  • FAS involves a combination of phonetic and prosodic speech alterations.
  • Stroke is the most frequent etiology, though other causes exist.
  • Diverse lesion locations have been associated with FAS, complicating a unified understanding.

Conclusions:

  • The heterogeneous etiologies and varied lesion sites raise questions about the consistent definition of FAS as a syndrome.
  • Further research is needed to establish a universal framework for understanding and diagnosing FAS.
  • The complex nature of FAS underscores the intricate relationship between brain function and speech production.