Study 2
1) Used the head-turn preference procedure to familiarize 17-month-olds with a dense neighborhood (the high-density condition, six lists of twelve neighbors) and a sparse neighborhood (the low density condition six lists of three neighbors plus nine filler items).
2) Used the split-screen preferential looking paradigm to teach infants two new words, one was the target from the dense neighborhood, the other the target of the sparse neighborhood.