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Sentential influences on acoustic-phonetic processing: A Granger causality analysis of multimodal imaging data
1Neuropsychology Laboratory, Massachusetts General Hospital, 175 Cambridge St., CPZ S340, Boston, MA 02114; Department of Psychology, Salem State University, 352 Lafayette St., Salem, MA 01970; Athinoula A. Martinos Center for Biomedical Imaging. Massachusetts General Hospital, 149 Thirteenth St., S2301, Charlestown, MA.02129; Harvard-MIT Division of Health Sciences and Technology, 77 Massachusetts Ave., E25-519, Cambridge, MA 02139.
Sentential context directly impacts speech perception by influencing how the brain processes ambiguous sounds. This study reveals that lexical information affects acoustic-phonetic processing during speech perception.
Area of Science:
- Cognitive Neuroscience
- Psycholinguistics
- Speech Perception
Background:
- Sentential context aids in identifying ambiguous speech sounds.
- It remains unclear if context influences early perception or later decision-making.
Purpose of the Study:
- To differentiate between direct perceptual influence and post-perceptual decision-making by context.
- To investigate the neural mechanisms underlying context effects in speech perception.
Main Methods:
- Utilized Magnetoencephalography (MEG) and Electroencephalography (EEG) data.
- Applied Kalman-filter enabled Granger causation analysis to MR-constrained data.
- Employed a retrospective probe verification task with ambiguous initial voicing words.
Main Results:
- Sentential context significantly influenced the interpretation of words with ambiguous initial voicing.
- Observed increased influence of lexical representation regions on acoustic-phonetic processing regions.
- Behavioral effects of context correlated with neural activity patterns.
Conclusions:
- Findings support an interactive model of speech perception.
- Sentence context directly influences perceptual processing of speech sounds.
- Neural evidence clarifies the role of context in resolving phonetic ambiguity.
