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The missing fundamental in vowel height perception

R P Fahey1, R L Diehl

  • 1University of Texas, Austin 78712, USA.

Perception & Psychophysics
|July 1, 1996
PubMed
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This study investigated vowel perception, finding that fundamental frequency (F0) significantly influences perceived vowel height. Results challenge the idea that the distance between the first formant (F1) and the lowest harmonic solely determines vowel height.

Area of Science:

  • Phonetics
  • Auditory Perception
  • Acoustic Phonetics

Background:

  • Traunmüller (1981) proposed that the tonotopic distance between the first formant (F1) and fundamental frequency (F0) dictates perceived vowel height.
  • This hypothesis suggests a direct relationship between acoustic properties and auditory vowel categorization.

Purpose of the Study:

  • To test Traunmüller's (1981) hypothesis regarding the role of F1-F0 distance in vowel height perception.
  • To investigate the influence of varying fundamental frequencies (F0) on the identification of vowels along a continuum from /I/ to /epsilon/.
  • To examine the effect of harmonic content on vowel height perception.

Main Methods:

  • Subjects identified vowels on a continuum from /I/ to /epsilon/ under five different fundamental frequency (F0) conditions.

Related Experiment Videos

  • Stimuli were manipulated to filter out lower harmonics, and their effect on perception was assessed.
  • Phoneme boundary shifts were analyzed in response to changes in F0 and harmonic filtering.

    • Main Results:

    • Increasing the fundamental frequency (F0) shifted the phoneme boundary towards /epsilon/, increasing the probability of /I/ responses.
    • Filtering lower harmonics resulted in only minor shifts in the phoneme boundary, indicating a limited role for these lower components.
    • The observed shifts in phoneme boundary provide empirical data on the perceptual relevance of F0 in vowel height judgments.

    Conclusions:

    • The study provides evidence against interpretations that solely attribute vowel height perception to the distance between F1 and the lowest audible harmonic.
    • Fundamental frequency (F0) plays a significant role in modulating perceived vowel height, independent of the lowest harmonic.
    • Perceptual models of vowel height should incorporate the influence of F0 alongside formant frequencies.