Age effects on prosodic boundary perception

Area of Science:

• Auditory Neuroscience
• Psychoacoustics
• Speech Perception

Background:

• The redundancy hypothesis suggests older adults require more acoustic information for speech perception.
• Aging can impact the processing of auditory cues crucial for understanding speech.
• Prosodic cues (pause, lengthening, pitch) play a role in segmenting speech.

Purpose of the Study:

• To investigate the redundancy hypothesis in relation to aging and speech segmentation.
• To examine how younger and older Mandarin Chinese listeners use prosodic cues.
• To understand age-related differences in processing prosodic boundaries.

Main Methods:

• Comparing speech segmentation strategies of younger and older adults.
• Utilizing stimuli with syntactically ambiguous phrase pairs in Mandarin Chinese.
• Assessing the use of pause, final lengthening, and pitch change cues in 8 conditions.

Main Results:

• Both age groups prioritized pause cues for speech segmentation.
• Older listeners demonstrated reduced sensitivity to final lengthening and pitch change.
• Older adults integrated pause and pitch change cues for improved segmentation accuracy.

Conclusions:

• Older listeners employ a compensatory integration strategy for speech segmentation.
• Findings support the redundancy hypothesis regarding age-related auditory processing.
• Prosodic cue integration is key for older adults' speech perception.