Perspectives on the origin of language: Infants vocalize most during independent vocal play but produce their most speech-like vocalizations during turn taking.

Fig 1A shows that this pattern of massive difference occurred in the raw data at all three Ages, and the 95% confidence intervals make clear that the differences were highly significant (at all three Ages, p < .0001) with extremely large effect sizes (Cohen’s d = 2.7, 3.0 and 2.7 at the three Ages respectively).

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TT, p = .021), with no interaction and an Age effect with marginal significance ( p = .055).

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