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Frequency of infant lip-smacking and tongue protrusion. Infant production of lip-smacks (LS) and tongue protrusions (TP) during observation of the Disk, LS, and TP conditions, in the saline and oxytocin (OT) treatments. Error bars represent ±1 standard error. Significant differences between treatments are denoted by asterisks (** p < 0.01, *** p < 0.001).
