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Related Experiment Video

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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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Word-level prominence in Persian: An Experimental Study.

Vahid Sadeghi1

  • 1Imam Khomeini International University, Iran.

Language and Speech
|January 24, 2017
PubMed
Summary

Persian stress primarily affects syllable duration, even without pitch accent. Intensity and spectral tilt are only affected when pitch accent is present, indicating duration is the key stress cue.

Area of Science:

  • Phonetics and Phonology
  • Acoustic Analysis of Speech
  • Linguistic Prosody

Background:

  • Previous research identified fundamental frequency as the sole reliable acoustic correlate of stress in Persian.
  • Stressed and unstressed syllables were considered indistinguishable without accentuation in prior studies.
  • The role of other acoustic parameters in signaling Persian stress remained underexplored.

Purpose of the Study:

  • To investigate the influence of lexical stress on syllable duration, overall intensity, and spectral tilt in Persian.
  • To examine these effects under both accented and unaccented conditions.
  • To provide a phonological interpretation of the findings regarding Persian word-level prominence.

Main Methods:

  • Acoustic analysis of Persian speech samples.
Keywords:
PersianStressaccentspectral tiltvowel reduction

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  • Measurement of syllable duration, overall intensity, and spectral tilt.
  • Comparison of acoustic parameters between stressed and unstressed syllables in accented and unaccented contexts.

    • Main Results:

    • Syllable duration was consistently affected by stress in Persian, irrespective of accentuation and vowel type.
    • Overall intensity and spectral tilt showed significant differences only in the accented condition.
    • Intensity variations were primarily attributed to pitch movement rather than stress itself.

    Conclusions:

    • Syllable duration is a robust acoustic correlate of lexical stress in Persian, present even in the absence of pitch accent.
    • Intensity-based measures are not direct correlates of Persian stress but are influenced by pitch accentuation.
    • Persian word-level prominence aligns with 'stress accent' languages, utilizing multiple phonetic cues for contrast in accented contexts.