Poor phonetic perceivers are affected by cognitive load when resolving talker variability.

Area of Science:

• Auditory neuroscience
• Speech perception research
• Cognitive psychology

Background:

• Speech training often manipulates talker variability to enhance learning.
• Individual differences in aptitude interact with external factors, affecting speech perception and learning.
• Previous studies show high-aptitude learners benefit from talker variability, while low-aptitude learners are impaired.

Purpose of the Study:

• To investigate the role of cognitive resources in speech perception, particularly concerning talker variability.
• To test the hypothesis that low-aptitude individuals are less efficient in using cognitive resources compared to high-aptitude individuals.
• To examine how cognitive load affects speech perception in individuals with varying aptitudes.

Main Methods:

• Participants with high and low aptitude for speech perception were recruited.
• Subjects identified pitch contours from multiple talkers under varying cognitive load conditions (high and low).
• Cognitive load was manipulated using a secondary task.

Main Results:

• High-aptitude listeners consistently outperformed low-aptitude listeners across all cognitive load conditions.
• Increased cognitive load significantly impaired speech perception performance only in low-aptitude listeners.
• Findings suggest differences in cognitive resource availability or attentional allocation between aptitude groups.

Conclusions:

• Cognitive load is a critical factor influencing individual differences in speech perception.
• Low-aptitude listeners may possess fewer cognitive resources or struggle with attention allocation to auditory signals.
• These findings have implications for designing effective speech training paradigms that account for individual cognitive capacities.