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Uncovering mental representations of smiled speech using reverse correlation.

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Listeners perceive smiles in speech by focusing on spectral cues, specifically the formants of vowels. This study reveals the crucial role of these acoustic properties in recognizing emotional expressions in speech.

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Area of Science:

  • Acoustic Phonetics
  • Speech Perception
  • Psychoacoustics

Background:

  • Understanding how listeners perceive non-linguistic information in speech, such as emotional and social cues, is crucial.
  • Spectral characteristics of speech signals, particularly vowel formants, are known to vary with vocal tract configurations.

Purpose of the Study:

  • To identify the specific spectral cues listeners use to perceive smiles in speech.
  • To investigate the role of vowel formants in the perception of smiles in isolated vowels.

Main Methods:

  • Employed a reverse-correlation technique with isolated vowel utterances.
  • Listeners judged pairs of spectrally manipulated utterances to identify the one perceived as more smiling.

Main Results:

  • Listeners reliably used spectral information, specifically vowel formants, to identify smiling speech.
  • The study demonstrated a causal link between formant characteristics and the perception of smiles.

Conclusions:

  • Vowel formants are critical spectral cues for the perception of smiles in speech.
  • The findings support a generalizable method for analyzing spectral bases of high-level speech representations, including emotional and social cues.