Tonal cues to prosodic structure in rate-dependent speech perception.

Area of Science:

• Psycholinguistics
• Speech Perception
• Phonetics

Background:

• Listeners use prosodic cues like pitch and duration to interpret speech.
• Understanding how these cues interact to influence speech rate perception is crucial.

Purpose of the Study:

• To investigate the integration of tonal and durational cues in speech rate perception.
• To determine how this integration affects the interpretation of durational cues, specifically vowel duration.

Main Methods:

• Three experiments manipulated pitch and duration of pre-target speech segments.
• Listeners categorized vowel duration along a continuum, with manipulations affecting coda stop voicing perception.
• Explicit duration and rate judgment tasks were also employed.

Main Results:

• Tonal cues on lengthened syllables signaled a speech rate slowdown, shifting vowel duration perception.
• Effects of pitch and duration were additive in a 2x2 design for categorization.
• Explicit rate judgments relied solely on duration, not pitch, indicating limited cue integration.

Conclusions:

• Integration of tonal and durational prosodic cues for speech rate perception is largely implicit.
• Explicit rate judgments show less integration, relying primarily on durational information.
• This highlights the complex interplay of prosodic cues in speech processing.