The infants, they found, listened longer to subsequent tapes that didn't contain these words than to those that did--suggesting the babies had learned the words.
Babies did not listen to tapes without certain words compared to others.
mnli hypothesis: Babies did not listen to tapes without certain words compared to others. premise: The infants, they found, listened longer to subsequent tapes that didn't contain these words than to those that did--suggesting the babies had learned the words.