“…Infants were surprisingly vocal even when they were out of arms reach of mother. In fact, consistent with the view that infants are active learners who self-socialize by generating immense practice with behaviors of all forms ( Tamis-LeMonda and Masek, in press ), infants in both samples produced as many babbles when nearby versus distant from their mothers. In fact, younger infants produced more babbles per hour when out of arms reach, and older infants were equally likely to produce babbles within and out of arms reach.…”