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Visual speech supports phonetic attunement in the absence of early auditory input

Federici, A.; Fantoni, M.; Battaglini, C.; Collesei, F.; Orzan, E.; Werker, J. F.; Polka, L.; Bianchi, B.; Handjaras, G.; Di Liberto, G. M.; Bottari, D.

2026-05-27 neuroscience
10.64898/2026.05.26.727650 bioRxiv
Show abstract

The first year of life is considered a sensitive period for the acquisition of phonetic categories, a hallmark of successful native language specialization. The extent to which this process depends on early auditory experience and intrinsic biological constraints remains unresolved. We measured neural encoding of continuous natural speech in hearing children (HC) and cochlear implant (CI) users with congenital or acquired deafness, contrasting children with and without access to auditory input in the first year of life. Speech encoding was present across all groups, but its specificity depended on early input: auditory phonetic features were encoded only in children exposed to speech within the first year, whereas visually discriminable phonetic features were encoded regardless of auditory deprivation. These findings show that early sensory input gates phonetic attunement; this constraint is not limited to or grounded in audition but instead reveals a sensitive period that is modality-flexible in mechanism and experience-dependent in expression.

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