The document outlines 7 stages of vocal development in children from 0-24 months. Key stages include cooing and laughing from 8-20 weeks, babbling from 25-50 weeks, and a vocabulary of around 200 words by 18-24 months. It also summarizes theories of language acquisition, including imitation, innateness, cognition, and input theories.

1. Child Language Acquisition Speaking.

4. The Theories. The Imitation Theory. David Crystal Children learn language through copying and imitating others. This is how children develop regional accents. The Innateness Theory. Noam Chomsky Language Acquisition Device – the special brain mechanism which allows us to learn language. All languages shares a structure – universal grammar. The Cognition Theory. Jean Piaget A child must understand a word before they use it. They have to experience a word before they can use it. If they use a word to describe a feeling, such as “anger”, they have to understand what it is like to have that feeling. The Input Theory. Similar to ‘behaviourism’ by Skinner Child Directed Speech is the biggest influence to a child’s language development. Parents speak slowly to children, they also use a higher pitch and full grammatical structures. They enforce turn taking and question and answer sequences.

5. The Theories. Test. The Imitation Theory. David Crystal Children learn language through copying and imitating others. This is how children develop regional accents. The Innateness Theory. Noam Chomsky Language Acquisition Device – the special brain mechanism which allows us to learn language. All languages shares a structure – universal grammar. The Cognition Theory. Jean Piaget A child must understand a word before they use it. They have to experience a word before they can use it. If they use a word to describe a feeling, such as “anger”, they have to understand what it is like to have that feeling. The Input Theory. Similar to ‘behaviourism’ by Skinner Child Directed Speech is the biggest influence to a child’s language development. Parents speak slowly to children, they also use a higher pitch and full grammatical structures. They enforce turn taking and question and answer sequences.

6. Over and underextension Categorical Analogical Mismatch Statements One word is applied to everything in that category. For example: “apple” = orange, peach... Other round fruits. One word used to describe something in a different category. For example: “ball” = apple, melon... Other things which resemble a ball. The word used is random, has loose association with the objet. Perhaps through the environment or the child’s personal experience. For example: “duck” = When they see an empty pond.

7. Over and underextension Test. Categorical Analogical Mismatch Statements One word is applied to everything in that category. For example: “apple” = orange, peach... Other round fruits. One word used to describe something in a different category. For example: “ball” = apple, melon... Other things which resemble a ball. The word used is random, has loose association with the object. Perhaps through the environment or the child’s personal experience. For example: “duck” = When they see an empty pond.

8. Bellugi’s Theories. Stages of Negation Stage 1: The child will use “no” at the start or end of the sentence. e.g. “No wear shoes.” Stage 2: Moves “no” / “not” inside of the sentence. e.g. “I no want it.” Stage 3: Achieves the correct form. e.g. “I don’t want to...” Stages of Pronouns Stage 1: Uses own name. “ Tom play.” Stage 2: Recognises “I” and “Me” (First person object and subject pronouns.) e.g. “Me play toy” Stage 3: Learns the correct form.

9. Bellugi’s Theories. Test. Stages of Negation Stage 1: The child will use “no” at the start or end of the sentence. e.g. “No wear shoes.” Stage 2: Moves “no” / “not” inside of the sentence. e.g. “I no want it.” Stage 3: Achieves the correct form. e.g. “I don’t want to...” Stages of Pronouns Stage 1: Uses own name. “ Tom play.” Stage 2: Recognises “I” and “Me” (First person object and subject pronouns.) e.g. “Me play toy” Stage 3: Learns the correct form.