Acoustic determinants of phrase boundary perception

Area of Science:

• Psycholinguistics
• Speech Perception
• Acoustic Phonetics

Background:

• Phrase boundary perception is crucial for understanding spoken language.
• Ambiguous syntactic structures pose challenges for listeners.
• Supersegmental variables play a role in prosodic interpretation.

Purpose of the Study:

• To investigate how three supersegmental variables influence phrase boundary perception.
• To determine if these variables are sufficient to disambiguate meaning.
• To examine the additive effects of pitch and duration on parsing decisions.

Main Methods:

• Two experiments were conducted using ambiguous algebraic expressions.
• Supersegmental variables (amplitude, pitch contour, duration pattern) were manipulated using linear predictive coding analysis-synthesis.
• Listeners identified phrase boundaries in expressions with varied prosodic cues.

Main Results:

• Listeners utilize all three investigated supersegmental variables to parse utterances.
• Exchanging these variables between meanings could completely shift the perceived interpretation.
• The effects of duration pattern and pitch contour were found to be additive.

Conclusions:

• Amplitude, pitch contour, and duration pattern are key cues for resolving syntactic ambiguity.
• These prosodic features are sufficient to determine phrase boundary perception.
• Listeners process pitch and duration information independently when making parsing decisions.