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. 2015 Sep 29;23(4):216–223. doi: 10.1177/1742271X15609367

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Percentage of fetuses that are active (FA) and make mouthing (MT) and tongue expulsion (TE) movements, according to gestational age. The gestational age influenced the percentage of general activity (a), but not generally mouthing movements (b). Vibroacoustic stimulation did not elicit TE in fetuses < 16 weeks, and the percentage of TE with stimulus increased significantly with age (c). ¹6.9% and 7.7% of fetuses at 24–31 and 32–39 weeks gestation, respectively, protruded their tongue ≥ 5 times in 5 minutes with intravaginal music (panel c)