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the claim

Infants learn to distinguish different languages during the first year of life

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that infants learn to distinguish different languages during the first year of life?

Yes. Extensive empirical research demonstrates that infants undergo perceptual narrowing during their first year of life, transitioning from universal phonetic discriminators to listeners whose speech perception is finely tuned to the contrasting sounds of their native language.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The retrieved literature robustly supports the claim that infants learn to distinguish different languages (or phonetic contrasts associated with them) during their first year of life, primarily through a process of perceptual narrowing and statistical learning (e.g., Papers 0, 2, 8, 9). None of the papers refute this foundational developmental milestone.

Evidence for · 4
Theta brain rhythms index perceptual narrowing in infant speech perception
2013
Supports the claim by showing that between 6 and 12 months, infants undergo perceptual narrowing where native speech discrimination increases while non-native discrimination declines.
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Bosseler, A., Taulu, S., Pihko, E., Mäkelä, J., Imada, T., Ahonen, A., & Kuhl, P. (2013). Theta brain rhythms index perceptual narrowing in infant speech perception. doi.org. https://doi.org/10.3389/fpsyg.2013.00690

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More for · 3
A Mechanistic Approach to Cross-Domain Perceptual Narrowing in the First Year of Life
2014
Supports the claim by outlining how early broad speech discrimination abilities become tuned to frequently experienced languages during the first year of life.
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Hadley, H., Rost, G., Fava, E., & Scott, L. (2014). A Mechanistic Approach to Cross-Domain Perceptual Narrowing in the First Year of Life. doi.org. https://doi.org/10.3390/brainsci4040613

Does infant speech perception predict later vocabulary development in bilingual infants?
2019
Supports the claim by highlighting how phonetic discrimination and perceptual narrowing during the first year of life predict later vocabulary development.
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Singh, L. (2019). Does infant speech perception predict later vocabulary development in bilingual infants?. doi.org. https://doi.org/10.1016/J.WOCN.2019.100914

Early influence of language experience in non-native speech perception: Discrimination of three-way Thai stop contrasts by Korean and Japanese infants.
2024
Supports the claim by demonstrating that infants possess early sensitivities to phoneme contrasts, which are subsequently shaped by ambient language input during the first year of life.
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Nam, M., Yamane, N., Hwang, H. K., Onsuwan, C., Choi, Y., & Mazuka, R. (2024). Early influence of language experience in non-native speech perception: Discrimination of three-way Thai stop contrasts by Korean and Japanese infants.. doi.org. https://doi.org/10.1016/j.infbeh.2024.102005

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first checked04 Aug 2026
judged → SUPPORTED · 9004 Aug 2026
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