Why does the perception of phonetic boundaries shift in bimodal bilinguals?

💡 Explanation

Bimodal bilinguals experience audiovisual integration during speech perception. The McGurk effect shows that visual articulatory information influences auditory perception; because bimodal bilinguals use both auditory and visual cues, their phonetic categories are recalibrated by this integrated information. Therefore, phonetic boundaries shift rather than remain fixed, reflecting cross-modal adaptation.

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