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Çetinçelik, M., Rowland, C. F., & Snijders, T. M. (2023). Ten-month-old infants’ neural tracking of naturalistic speech is not facilitated by the speaker’s eye gaze. Developmental Cognitive Neuroscience, 64: 101297. doi:10.1016/j.dcn.2023.101297.
Abstract
Eye gaze is a powerful ostensive cue in infant-caregiver interactions, with demonstrable effects on language acquisition. While the link between gaze following and later vocabulary is well-established, the effects of eye gaze on other aspects of language, such as speech processing, are less clear. In this EEG study, we examined the effects of the speaker’s eye gaze on ten-month-old infants’ neural tracking of naturalistic audiovisual speech, a marker for successful speech processing. Infants watched videos of a speaker telling stories, addressing the infant with direct or averted eye gaze. We assessed infants’ speech-brain coherence at stress (1–1.75 Hz) and syllable (2.5–3.5 Hz) rates, tested for differences in attention by comparing looking times and EEG theta power in the two conditions, and investigated whether neural tracking predicts later vocabulary. Our results showed that infants’ brains tracked the speech rhythm both at the stress and syllable rates, and that infants’ neural tracking at the syllable rate predicted later vocabulary. However, speech-brain coherence did not significantly differ between direct and averted gaze conditions and infants did not show greater attention to direct gaze. Overall, our results suggest significant neural tracking at ten months, related to vocabulary development, but not modulated by speaker’s gaze.Additional information
supplementary material -
Fahrenfort, J. J., Snijders, T. M., Heinen, K., van Gaal, S., & Scholte, H. S. (2012). Neuronal integration in visual cortex elevates face category tuning to conscious face perception. Proceedings of the National Academy of Sciences of the United States of America, 109(52), 21504-21509. doi:10.1073/pnas.1207414110.
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Kos, M., Van den Brink, D., Snijders, T. M., Rijpkema, M., Franke, B., Fernandez, G., Hagoort, P., & Whitehouse, A. (2012). CNTNAP2 and language processing in healthy individuals as measured with ERPs. PLoS One, 7(10), e46995. doi:10.1371/journal.pone.0046995.
Abstract
The genetic FOXP2-CNTNAP2 pathway has been shown to be involved in the language capacity. We investigated whether a common variant of CNTNAP2 (rs7794745) is relevant for syntactic and semantic processing in the general population by using a visual sentence processing paradigm while recording ERPs in 49 healthy adults. While both AA homozygotes and T-carriers showed a standard N400 effect to semantic anomalies, the response to subject-verb agreement violations differed across genotype groups. T-carriers displayed an anterior negativity preceding the P600 effect, whereas for the AA group only a P600 effect was observed. These results provide another piece of evidence that the neuronal architecture of the human faculty of language is shaped differently by effects that are genetically determined.
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