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Motor activation from visible speech: evidence from stimulus response compatibility
1Department of Cognition and Action, Max Planck Institute for Psychological Research, Munich, Germany. kerzel@mpipf-muenchen.mpg.de
Summary
The motor theory of speech perception suggests motor control is key for processing visible speech. This study confirms motor involvement in speech perception, showing visual cues influence spoken responses.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Linguistics
Background:
- Speech perception integrates auditory and visual information.
- The motor theory of speech perception posits motor control involvement in processing visible speech.
- Alternative perceptual accounts do not assume motor involvement.
Purpose of the Study:
- To investigate motor involvement in speech perception.
- To test the motor theory of speech perception's prediction of motor control structures processing visible speech.
- To determine if visual speech processing extends to response-related stages.
Main Methods:
- Participants viewed response-irrelevant mouth movements articulating /ba/ or /da/.
- Participants verbally responded with the same or a different syllable.
- Experiments used response-unrelated stimuli and preexposure to rule out perceptual interference.
Main Results:
- A reliable interference effect was observed between visual speech stimuli and verbal responses.
- Perceptual interference was ruled out through experimental controls.
- Simple visual features did not explain the observed effect.
Conclusions:
- Visible speech is processed to a late, response-related stage.
- Findings support the motor theory of speech perception.
- Motor control structures are involved in processing visible speech information.