Successful non-native speech perception is linked to frequency following response phase consistency

Area of Science:

• Neuroscience
• Second Language Acquisition
• Auditory Perception

Background:

• Individual differences in adult second language (L2) learning success are significant.
• The role of auditory perception, particularly in non-native speech, remains debated.
• Understanding factors influencing L2 learning is crucial for educational and clinical applications.

Purpose of the Study:

• To investigate the link between auditory perception and L2 English speech perception in native Japanese speakers.
• To determine if neural timing precision in auditory processing predicts L2 consonant perception.
• To compare the predictive power of neural timing jitter against demographic factors like age of arrival and length of residence.

Main Methods:

• Utilized frequency following responses (FFRs) and evoked gamma band responses (eGBRs) to measure neural auditory processing.
• Employed behavioral measurements to assess English consonant perception.
• Analyzed trial-to-trial timing jitter in neural responses as a key metric.

Main Results:

• Participants with less trial-to-trial timing jitter in their neural responses showed superior English consonant perception.
• Neural timing jitter was a stronger predictor of consonant perception than age of arrival or length of residence in the UK.
• Neural jitter explained unique variance in consonant perception, independent of demographic variables.

Conclusions:

• Precise auditory neural timing is a significant factor in successful adult second language learning.
• Difficulties in auditory perception, specifically neural timing variability, may contribute to challenges in L2 acquisition.
• These findings highlight the importance of auditory processing skills for non-native speech perception.