Kjellrun T. Englund Characteristics of and Preference for Infant Directed Speech

________________________________________________________ 5 AIMS AND OUTLINE_________________________________________________ 8 INTRODUCTION ___________________________________________________ 10 How does an infant come to know the world of language? ___________________ 11 When does speech perception start? ___________________________________________________13 Speech perception after birth ________________________________________________________16 Vowels _______________________________________________________________________16 Consonants ___________________________________________________________________18 Visual perception _________________________________________________________________21 Multimodal perception _____________________________________________________________22 Theoretical foundation___________________________________________________________25 Theoretical accounts of speech perception and IDS ________________________ 27 Historical perspective ______________________________________________________________27 Word Recognition and Phonetic Structure Acquisition ____________________________________29 Bootstrapping approach ____________________________________________________________30 Native Language Magnet Theory _____________________________________________________31 An alternative explanation of the magnet effect________________________________________33 Mother-Infant Phonetic Interaction Model ______________________________________________34 How does an adult adapt language to an infant? ___________________________ 36 Interaction between infant and environment_____________________________________________36 Fathers’ vs. mothers’ IDS___________________________________________________________38 Infant preference for IDS ___________________________________________________________39 Attention and affect in IDS__________________________________________________________41 Facial expressions in IDS ________________________________________________________43 Segments in IDS __________________________________________________________________44 Vowels _______________________________________________________________________44 Consonants ___________________________________________________________________46 Does what parents do affect language development? ______________________________________48 Methodological issues_________________________________________________ 52 Ethical considerations______________________________________________________________52 Speech outcome depends on situation _________________________________________________53 Statistical analysis_________________________________________________________________58 PAPERS I-IV _______________________________________________________ 59 DISCUSSION _______________________________________________________ 60 Summary of findings for papers I-IV ____________________________________ 60 Paper I__________________________________________________________________________60 Paper II _________________________________________________________________________61 Paper III ________________________________________________________________________61