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Updated: Jun 14, 2025
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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
Published on: February 23, 2020
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Multisensory integration and motor resonance in the primary motor cortex
Serena Giurgola1, Emanuele Lo Gerfo2, Alessandro Farnè3
1Department of Psychology & NeuroMI - Milan Center for Neuroscience, University of Milano-Bicocca, Milan, Italy.
Summary
Seeing and hearing speech simultaneously enhances syllable identification and boosts motor cortex excitability. This multisensory integration improves speech processing by influencing the motor system's resonance to sounds.
Area of Science:
- Neuroscience
- Speech Perception
- Multisensory Integration
Background:
- The human motor system resonates to speech sounds.
- The impact of visual lip movements on speech perception via motor resonance is not well understood.
Purpose of the Study:
- To investigate how visual lip information affects speech perception at a motor level.
- To explore behavioral and neurophysiological evidence of multisensory integration in speech perception.
Main Methods:
- Recorded motor-evoked potentials (MEPs) from the lip muscle (orbicularis oris) using transcranial magnetic stimulation (TMS).
- Presented syllables in unimodal (auditory/visual) and multisensory (audio-visual) congruent/incongruent conditions to healthy participants.
Main Results:
- Behaviorally, participants identified syllables better in congruent audio-visual conditions than unimodal ones.
- Neurophysiologically, MEP amplitudes increased in the congruent audio-visual condition.
- Illusory percepts from incongruent stimuli did not enhance corticospinal excitability.
Conclusions:
- Congruent audio-visual speech enhances lip representation excitability in the primary motor cortex.
- Multisensory integration facilitates speech processing by modulating motor resonance.
- Multisensory interactions occur in primary motor areas, not just higher-order regions.
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