 Peter Jusczyk argued that infants use prosody to parse speech into smaller units for analysis.He, along with colleagues, reported that 4.5 month old infants illustrated a preference for artificial pauses at clause boundaries in comparison to pauses at other places in a sentence; preferring pauses at clause boundaries illustrates infants' abilities to discriminate clauses in a passage.This reveals that while infants do not understand word meaning, they are in the process of learning about their native language and grammatical structure.