4/27/2023 0 Comments Auditory perception![]() Vocoders are powerful speech analysis and synthesis tools that can selectively manipulate the spectro-temporal properties of sound ( 14). We combined a vocoder manipulation of speech with brain imaging to test how newborns process and perceive the temporal modulations in speech essential for speech intelligibility in adulthood. To determine how newborn infants, who have little experience with their native language and an immature auditory system, process the temporal acoustic cues of speech to perceive consonants, we used two hitherto rarely combined approaches. Thus, the immature human brain is already able to decompose the acoustic components of speech, laying the foundations of language learning. ![]() Yet, the fast and slow AM activate different neural areas, as shown by NIRS. EEG responses indicate that neonates can encode consonants in all conditions, even without the fast temporal modulations, similarly to adults. The syllables were presented in three conditions preserving (i) original temporal modulations of speech, (ii) both fast and slow AM, but not FM, or (iii) only the slowest AM (<8 Hz). To assess neonates’ ability to process the complex acoustic cues of speech, we combined near-infrared spectroscopy (NIRS) and electroencephalography (EEG) to measure brain responses to syllables differing in consonants. Although at birth infants have an immature auditory system and limited language experience, they show remarkable speech perception skills. Speech perception is constrained by auditory processing.
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