The role of left inferior frontal cortex during audiovisual speech perception in infants
In the first year of life, infants’ speech perception attunes to their native language. While the behavioral changes associated with native language attunement are fairly well mapped, the underlying mechanisms and neural processes are still only poorly understood. Using fNIRS and eye tracking, the c...
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| Veröffentlicht in: | NeuroImage (Orlando, Fla.) Fla.), 2016-06, Vol.133, p.14-20 |
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| creator | Altvater-Mackensen, Nicole Grossmann, Tobias |
| description | In the first year of life, infants’ speech perception attunes to their native language. While the behavioral changes associated with native language attunement are fairly well mapped, the underlying mechanisms and neural processes are still only poorly understood. Using fNIRS and eye tracking, the current study investigated 6-month-old infants' processing of audiovisual speech that contained matching or mismatching auditory and visual speech cues. Our results revealed that infants’ speech-sensitive brain responses in inferior frontal brain regions were lateralized to the left hemisphere. Critically, our results further revealed that speech-sensitive left inferior frontal regions showed enhanced responses to matching when compared to mismatching audiovisual speech, and that infants with a preference to look at the speaker's mouth showed an enhanced left inferior frontal response to speech compared to infants with a preference to look at the speaker's eyes. These results suggest that left inferior frontal regions play a crucial role in associating information from different modalities during native language attunement, fostering the formation of multimodal phonological categories. |
| doi_str_mv | 10.1016/j.neuroimage.2016.02.061 |
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While the behavioral changes associated with native language attunement are fairly well mapped, the underlying mechanisms and neural processes are still only poorly understood. Using fNIRS and eye tracking, the current study investigated 6-month-old infants' processing of audiovisual speech that contained matching or mismatching auditory and visual speech cues. Our results revealed that infants’ speech-sensitive brain responses in inferior frontal brain regions were lateralized to the left hemisphere. Critically, our results further revealed that speech-sensitive left inferior frontal regions showed enhanced responses to matching when compared to mismatching audiovisual speech, and that infants with a preference to look at the speaker's mouth showed an enhanced left inferior frontal response to speech compared to infants with a preference to look at the speaker's eyes. 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| subjects | Age Audiovisual speech perception Brain Mapping - methods Brain research Cues Eye tracking Female fNIRS Frontal Lobe - physiology Humans Infant Language Language development Lipreading Listening comprehension Male Native languages Nerve Net - physiology Neural networks Newborn babies Perceptual Masking - physiology Phonetics Reading comprehension Recruitment Second language learning Sound Speech Speech Perception - physiology Studies Visual Perception - physiology Visual speech cues |
| title | The role of left inferior frontal cortex during audiovisual speech perception in infants |
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