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the claim

The first formant F1 is directly dependent on vocal tract constriction and tongue height

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 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 the first formant F1 is directly dependent on vocal tract constriction and tongue height?

Yes. The first formant F1 is well established in speech acoustics to be directly dependent on vocal tract constriction and tongue height, a relationship supported by empirical ultrasound and acoustic studies.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

The analysis

The retrieved papers include direct phonetic and acoustic studies (such as those examining tongue-body height and jaw opening relative to acoustic formants) confirming that F1 varies predictably with vocal tract constriction and tongue height.

Evidence for · 2
A comparison of acoustic and articulatory parameters for the GOOSE vowel across British Isles Englishes.
2019
This study finds a significant positive correlation between tongue-body height and acoustic height (F1), supporting the claim that F1 is directly related to tongue height and vocal tract constriction.
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Lawson, E., Stuart-Smith, J., & Rodger, L. (2019). A comparison of acoustic and articulatory parameters for the GOOSE vowel across British Isles Englishes.. doi.org. https://doi.org/10.1121/1.5139215

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More for · 1
Vocal tract dynamics shape the formant structure of conditioned vocalizations in a harbor seal
2024
This study demonstrates that jaw opening angle and vocal tract constriction are strongly correlated with the first formant F1.
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Goncharova, M., Jadoul, Y., Reichmuth, C., Fitch, W. T., & Ravignani, A. (2024). Vocal tract dynamics shape the formant structure of conditioned vocalizations in a harbor seal. doi.org. https://doi.org/10.1111/nyas.15189

What does the evidence say?

The retrieved papers include direct phonetic and acoustic studies (such as those examining tongue-body height and jaw opening relative to acoustic formants) confirming that F1 varies predictably with vocal tract constriction and tongue height.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8304 Aug 2026
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