Language Acquisition

Developmental Psychology Notes

Special Features of Human Language

Understanding vs. Speaking

  • Understanding (comprehending language) and speaking (creating language) progress at different speeds. Often, understanding develops faster than speaking in infants. This difference shows how complex language learning is and highlights the need for support during early childhood.

Creativity in Language

  • Language includes a limited set of parts that can create endless combinations, showing our special ability to express new thoughts. An example is the phrase "Colorless green ideas sleep furiously!" which demonstrates how grammar helps in expressing abstract ideas and creativity.

Symbol System

  • The symbol system of language stands for and shares ideas and feelings, helping people interact, express culture, and create understanding.

Case Study: Nicaraguan Sign Language

Historical Background

  • Before the 1970s, Nicaragua did not have a formal deaf community, which led to isolation for deaf children. Opening a school for the deaf brought these children together, where they created their own sign language, showing the natural human desire to communicate.

Key Insights

  • This case highlights that language development needs community interaction and social involvement. Children learned to communicate effectively by engaging with each other and building a complete language system.

Requirements for Language

Having a Human Brain

  • Language processing occurs in specific parts of the brain, like Broca's area and Wernicke's area, which are crucial for speaking and understanding.

  • Species-specific: Only humans usually acquire language, which sets our ability apart from other species.

  • Species-universal: All humans on a normal developmental path learn language, showing the biological basis for this ability. The case of Genie illustrates the importance of early exposure to structured language for learning.

  • Sensitive Period: There are optimal times for learning language, especially before age 7, when the brain is more open to language input.

Being in a Human Community

  • Early language development requires exposure to language and involvement in a community. For example, Infant-Directed Speech (IDS) is a speech style used with language learners that has a higher pitch and simpler words, helping infants recognize speech patterns and foster language skills. Variations of IDS exist in many cultures, showing its importance.

Language Learning and Timeline

What Do We Learn and When?

  • Learning phases include:

    • Sounds: Basic sounds (phonemes) of the language.

    • Words: Combining sounds to form words and their meanings.

    • Combinations: Learning grammar and structure that affect meaning.

    • Context: Understanding tone, time, place, and people involved in communication, which adds depth to interactions.

  • Phoneme Recognition: Infants can hear up to 200 phonemes at birth; however, through Perceptual Narrowing, they usually lose sensitivity to sounds not in their language around 10-12 months, fine-tuning their skills to the phonological patterns important for their language environment.

Speech Development Stages

  • First Sounds: Cooing around 6-8 weeks marks the start of vocal exploration, indicating the onset of vocal experimentation.

  • Babbling: Occurs around 6-10 months, where infants repeat consonant-vowel combinations (e.g., "ba," "ma"), reflecting the sound patterns of the surrounding language, helping them become comfortable with sound production.

  • Manual Babbling: Deaf infants show similar babbling in sign language, indicating that creating patterns in language is not limited to spoken forms.

Understanding Language Parts

Sounds and Word Parts

  • Recognizing phonemes is vital for understanding language. Different languages may have varying numbers of phonemes; for example, English uses 44 phonemes.

Words and Their Meanings

  • Children learn the boundaries of words statistically, figuring out meanings through experience and context. Strategies that help include:

    • Whole-Object Assumption: Belief that words refer to entire objects instead of parts.

    • Shape Assumption: Tendency to use a label based on an object's shape.

    • Mutual Exclusivity: Preference to assign one name to one object.

Combining Words: Grammar

  • Combinations: Children learn grammar rules even before they can speak phrases, indicating complex thinking.

  • Single Word Period: Involves using single words to express complex meanings, such as saying "Milk!" to mean "I want milk!"

  • Two-Word Sentences: Develop into combined phrases, showing grammar understanding, as in "More milk!" indicating concise communication of desires.

Practical Knowledge

  • Understanding Context: Children learn meaning from emotional tone, situational clues, and implications in language use, which helps with effective communication.

  • The growth of conversational skills, like taking turns and understanding social cues, enriches language learning and encourages social connections.

Conclusion

Language learning is a complex process involving biological, mental, and social factors, with key stages in sounds, words, combinations, and context. Early exposure to language is crucial for effective learning and mastery, emphasizing the vital role of interaction and social engagement in language development.