Time and information in perceptual adaptation to speech

Area of Science:

• Cognitive Science
• Auditory Perception
• Speech Processing

Background:

• Perceptual adaptation to talker variability is crucial for efficient speech comprehension.
• Existing models lack detail on the quantity and quality of information needed for adaptation.
• Understanding adaptation dynamics is key to refining speech perception models.

Purpose of the Study:

• Investigate how talker-specific context quantity, quality, and continuity influence speech perceptual adaptation.
• Quantify the impact of preceding speech duration and phonetic detail on adaptation.
• Examine the role of temporal continuity in adaptation efficiency.

Main Methods:

• Three experiments used speeded classification of spoken words.
• Listeners identified target words preceded by carrier phrases of varying lengths and phonetic content.
• Conditions included single-talker and mixed-talker scenarios to assess adaptation effects.

Main Results:

• Word identification was slower in mixed-talker conditions compared to single-talker conditions.
• Increased duration of preceding speech reduced interference from talker variability.
• Adaptation efficiency gains were dependent on temporal continuity, not phonetic detail.

Conclusions:

• Speech adaptation efficiency is primarily driven by temporal continuity, not phonetic richness.
• Auditory streaming models may explain adaptation by perceptual continuity facilitating attention.
• Findings suggest adaptation enhances attentional resource allocation for efficient speech processing.