Rapid access to speech gestures in perception: Evidence from choice and simple response time tasks

Area of Science:

• Psycholinguistics
• Speech Production and Perception
• Cognitive Neuroscience

Background:

• Understanding the relationship between speech perception and production is crucial for explaining human language acquisition and processing.
• Previous research suggests a significant time cost associated with making choices in speech tasks, often attributed to cognitive processing delays.

Purpose of the Study:

• To investigate the speed of accessing articulatory speech information during perception-production tasks.
• To determine if listeners can rapidly link perceived speech to their own motor commands for speech production.

Main Methods:

• Two speech tasks were conducted: a simple response task and a choice task, involving participants shadowing vowels and responding to consonant-vowel (CV) syllables.
• Response times were measured from the model speaker's consonant closure onset to the participant's closure onset.
• Acoustic analysis and additional experiments were used to validate measurement techniques and explore the perception-production link.

Main Results:

• Choice task response times exceeded simple task times by only 26 ms, significantly faster than previously reported latencies.
• When the perception-production link was disrupted, choice task times increased substantially, indicating its importance for rapid responses.
• Shadowing responses were confirmed to be imitations of the model speaker's speech.

Conclusions:

• Listeners demonstrate remarkably rapid access to articulatory speech information, enabling quick integration of perceived and produced speech.
• The findings challenge traditional models of speech processing by highlighting the efficiency of the perception-production system.
• This suggests that the motor system plays an active role in speech perception, facilitating rapid imitation and understanding.