The relationship between prosody and breathing in spontaneous discourse

Area of Science:

• Linguistics
• Psycholinguistics
• Speech Communication

Background:

• Prosody, encompassing intonation and rhythm, significantly influences how we interpret spoken language.
• Understanding how prosodic cues like pitch and intensity are used in discourse parsing is crucial for both typical and atypical communication.

Purpose of the Study:

• To investigate the distinct roles of pitch (fundamental frequency) and intensity declination in relation to syntactic boundaries.
• To compare the use of these prosodic features in individuals with and without Right Hemisphere Damage (RHD).

Main Methods:

• Three experiments were conducted, analyzing fundamental frequency and intensity at the start and end of breath units.
• Conversational speech samples were collected from both normal participants and those with RHD.
• Measurements focused on prosodic changes, specifically pitch resetting and intensity declination, around syntactic boundaries.

Main Results:

• Evidence of intensity declination was present in all participants' speech samples.
• Resetting of fundamental frequency was observed exclusively in normal participants.
• Fundamental frequency resetting occurred only when a breath unit coincided with the start of a new sentence in normal speakers.

Conclusions:

• Intensity declination and fundamental frequency resetting appear to serve distinct functions in discourse processing.
• Normal speakers utilize pitch resetting at syntactic boundaries to signal discourse structure, a mechanism potentially impaired in RHD.
• These findings highlight the complex interplay between prosody and syntax in effective communication and discourse segmentation.