Speaker Demographics Modulate Listeners' Neural Correlates of Spoken Word Processing.

Area of Science:

• Psycholinguistics
• Cognitive Neuroscience
• Sociolinguistics

Background:

• Listeners expect consistent word choice for object labeling.
• Speaker demographic factors, inferred from voice, affect language processing.
• Previous research suggests children may be less flexible in language use.

Purpose of the Study:

• To investigate if perceived speaker demographics influence expectations of label repetition versus switching.
• To examine whether listeners expect child speakers to switch labels less often than adult speakers.
• To explore the neural correlates of label switching expectations based on speaker age.

Main Methods:

• Event-related potentials (ERPs) were used to measure neural responses.
• An experiment involved 80 pictures with alternative Mandarin Chinese labels.
• Participants completed an establishment phase (label-picture matching) and a test phase (label repetition vs. switching) with either an adult or child speaker.

Main Results:

• Switched labels, compared to repeated labels, elicited N400 and P600 effects in the test phase.
• The N400 effect was significantly larger for child speakers than for adult speakers.
• This suggests listeners found label switching more difficult to comprehend when produced by a child.

Conclusions:

• Perceived speaker demographic background influences listeners' neural responses to spoken words.
• Listeners' expectations about label switching behavior are modulated by perceived speaker age.
• Findings contribute to understanding the interplay between social cognition and language processing.