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Lexical influences in audiovisual speech perception
Lawrence Brancazio1, Lawrence Brancazio
1Department of Psychology, Southern Connecticut State University, New Haven, CT, USA. brancazioL1@southernct.edu
Summary
Lexical status influences speech perception, even with conflicting visual cues (McGurk effect). Word perception is enhanced when visual input creates a word, suggesting modality-independent speech processing.
Area of Science:
- Cognitive Psychology
- Auditory Perception
- Speech Processing
Background:
- The McGurk effect demonstrates visual influence on phoneme identification.
- Lexical status of auditory stimuli affects speech perception.
- The interplay between lexical effects and audiovisual speech perception is not fully understood.
Purpose of the Study:
- To investigate lexical influences on the McGurk effect.
- To determine if lexical status affects phoneme identification in audiovisual speech.
- To test modality independence in speech processing models.
Main Methods:
- Participants identified phonemes in audiovisually discrepant stimuli.
- Lexical status of the auditory component and the visually influenced percept were independently varied.
- Experiments included varying stimulus properties and response times.
Main Results:
- Visually influenced (McGurk) responses were more frequent when they formed a word and the auditory signal was a nonword.
- Lexical effects were more pronounced for slower responses.
- Findings were replicated with physically matched stimuli.
Conclusions:
- Lexical processing of speech appears to be modality independent.
- The McGurk effect is modulated by lexical factors.
- This supports integrated models of speech perception across sensory modalities.