Supra-segmental Details in Early Lexical Representations
Recent studies have indicated that toddlers as young as 19 months old already have sophisticated phonological details in their lexical representations. Studies using word recognition tasks have also found that toddlers had graded sensitivities to varying degrees of mispronunciation changes in word onsets and vowels. However, existing studies have primarily investigated sensitivities to segments (vowels and consonants). Less is known about toddlers’ early lexical representations of supra-segmental units such as lexical tones. Unlike segmental units such as vowels and consonants, supra-segmental information is primarily carried across syllables. Phonetically, changes in supra-segmental units are broadly achieved by varying toddlers’ lexical representations of supra-segments. 19-month-old monolingual Mandarin learning toddlers were tested on their sensitivities to varying degrees of familiar word mispronunciations of lexical tones using the intermodal preferential looking paradigm (IPLP). The findings suggested that as toddlers’ sensitivities to mispronunciations increased as a function of the degree of the deviations from the correct forms, replicating previous studies for word-initial consonants and vowels. Therefore, 19-month-olds’ lexical representations appear to contain well-refined architecture in the supra-segmental dimensions.