Lexical Development: Learning Words, Fast Mapping, and Cross-Linguistic Semantic Organization 6

Ontological Categories and Word Extension Biases

  • Ontological Categories: Fundamental conceptual divisions (e.g., solid objects vs. non-solid substances) guide children's word meaning inductions.

  • Object-Substance Distinction (Soja et al.): Two-year-olds extended novel words (blicket) based on shape for solid objects and material composition for non-solid substances, demonstrating distinct mental categories for objects and substances.

  • Bases for Word Extension:

    • Shape Bias: Shape is the primary feature guiding noun extension; this bias emerges after acquiring a vocabulary threshold of approximately 5050 words (L. B. Smith).

    • Creator's Intention: For artifacts, categorization relies on inferred creator intent rather than appearance alone (Gelman & Ebeling: bear-shaped blobs were labeled based on intentional vs. accidental creation).

Word Form Encoding and Phonological Memory

  • Decoupling Sound and Meaning: Prior auditory exposure to word forms before introducing semantic information facilitates word acquisition (Swingley; Graf Estes).

  • Phonological Memory: The cognitive ability to retain novel sound sequences in memory is a key driver of individual differences in word-learning skill.

Learning Semantic Organization and Lexical Gaps

  • Semantic Organization: Structures how specific languages package cognitive concepts into lexical units.

  • Lexical Gaps: Children invent words (e.g., couch hole, pee mat) to fill conceptual gaps lacking native terms.

  • Cross-Linguistic Variations: Languages divide concepts differently (e.g., Spanish dedos encompasses both fingers and toes; Navaho uses distinct words for human vs. animal hair).

Fast Mapping and Carey's Color Study

  • Carey (1978) Color Study: Preschoolers exposed to chromium (referring to olive) did not master the exact word name, but altered their naming patterns for olive, showing awareness that it represented a distinct color category.

  • Fast Mapping: The initial, partial mapping of a novel word form to a conceptual domain following minimal exposure.

Cross-Linguistic Differences in Motion Verbs

  • Lexicalization Patterns: Manner languages (e.g., English) encode motion and manner within verb roots, while Path languages (e.g., Spanish) encode direction within verb roots (Talmy).

  • Caused vs. Spontaneous Motion: English uses path terms (e.g., down) for both caused and spontaneous motion, whereas Korean uses distinct verb roots for each (Choi & Bowerman).

  • Language Acquisition: From early development, children actively learn how their native language organizes and lexicalizes semantic components.