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Inner speech captures the perception of external speech.
Mark Scott1, H Henny Yeung, Bryan Gick
1Linguistics Department, University of British Columbia, Vancouver, Canada. shark_scott@hotmail.com
The Journal of the Acoustical Society of America
|April 6, 2013
Summary
Inner speech, or talking to ourselves, is explained by corollary discharge, the brain's prediction of sensory consequences. This mechanism biases perception, making external sounds align with imagined speech content.
Area of Science:
- Cognitive Neuroscience
- Psychology of Language
- Auditory Perception
Background:
- Inner speech is a common human experience, yet its neural mechanisms are poorly understood.
- Corollary discharge, a motor system prediction, is known to influence sensory processing.
- The role of corollary discharge in generating the auditory content of inner speech requires investigation.
Purpose of the Study:
- To provide behavioral evidence for the role of corollary discharge in inner speech.
- To investigate how inner speech influences auditory perception.
- To determine if this influence operates on basic speech elements.
Main Methods:
- Two behavioral experiments were conducted.
- Participants engaged in inner speech tasks.
- Perceptual biases in response to external auditory stimuli were measured.
Main Results:
- Inner speech induced a perceptual bias, making external sounds align with imagined speech.
- This bias was observed even at the subphonemic level of speech content.
- Behavioral evidence supports corollary discharge as the source of inner speech's auditory quality.
Conclusions:
- Corollary discharge mechanisms are integral to the experience of inner speech.
- Inner speech actively shapes auditory perception through predictive processing.
- The findings offer a novel explanation for the phenomenology of self-talk.
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