http://www.medicalnewstoday.com/medicalnews.php?newsid=73206 "In a series of experiments appearing in Psychological Science, a journal of the Association for Psychological Science, Gary Marcus and co-authors Keith Fernandes and Scott Johnson at New York University exposed infants to algebraically structured sequences that consisted of either speech syllables or non-speech sounds.
Once infants became familiar with these sequences, researchers presented the infants four new unique sequences: Two of these new sequences were consistent with the familiarization "grammar," while two were inconsistent. (For example, given familiarization with la ta ta, ge lai lai, consistent test sentences would include wo fe fe and de ko ko (ABB), while inconsistent sentences would include wo wo fe and de de ko (AAB). Marcus and his colleagues then measured how long infants attended to each sequence in order to determine whether they recognized the previously learned grammar. "
This is how they checked how babies responded to the non-native language -they didnt, their attendtion times varied between conditions
