Related Experiment Video
Updated: Aug 28, 2025
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A Semantic Priming Event-related Potential ERP Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder
Published on: April 12, 2018
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Cross-Modal Somatosensory Repetition Priming and Speech Processing
Aravind K Namasivayam1,2, Tina Yan1, Rohan Bali1
1Department of Speech-Language Pathology, University of Toronto, Toronto, ON M5G1V7, Canada.
Journal of Integrative Neuroscience
|September 22, 2022
Summary
Somatosensory stimulation influences speech processing by accessing articulatory information stored in the mental lexicon. This research shows how touch can impact word recognition, particularly for less frequent words.
Area of Science:
- Neuroscience
- Speech-Language Pathology
- Cognitive Science
Background:
- Motor speech interventions are used for aphasia, apraxia of speech, and speech-sound disorders.
- Understanding the mechanisms of action (MoA) of these interventions is crucial for optimizing treatment effectiveness.
- This study investigates the MoA of a specific motor speech intervention technique.
Purpose of the Study:
- To demonstrate that somatosensory inputs can influence lexical processing.
- To provide evidence that linguistic information in the brain encodes speech production details.
- To explore the link between somatosensory stimulation and speech perception.
Main Methods:
- A cross-modal repetition priming paradigm was employed.
- Participants received somatosensory priming stimulation to oro-facial structures (experimental group) or forehead (control group).
- The study examined modulation by word frequency (low/high) and articulatory features.
Main Results:
- Significant somatosensory priming effects were observed for low-frequency words.
- Congruent somatosensory stimulation led to shorter reaction times and higher phoneme accuracy.
- Control stimulation on the forehead showed no systematic priming effects.
Conclusions:
- Speech production information is represented in the mental lexicon.
- Exogenous somatosensory inputs related to the place of articulation can access this information.
- Findings support the integration of somatosensory feedback in speech processing models.
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