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Language Acquisition — Previous Year Questions

📊 Topic Overview​

MetricValue
Papers Appeared17/28 (60.7%)
Priority🔴 HIGH
Repeated Theme8–10 core repetitions
Years Appeared2011–2024 (most years)

🎯 Must-Know Concepts​

  1. Behaviouristic theory (Skinner) — operant conditioning, imitation, reinforcement
  2. Innateness/Nativist theory (Chomsky) — LAD, Universal Grammar, critical period
  3. Stages of language acquisition in children
  4. Second language acquisition
  5. Comparison of behaviouristic vs innateness

📝 All Previous Year Questions​

Year-SessionQuestionMarks
2011-JuneDiscuss the innateness theory of language acquisition10
2011-DecemberExplain the behaviouristic theory of language acquisition10
2013-JuneCompare behaviouristic and innateness theories of language acquisition10
2014-JuneDiscuss the stages of language acquisition in children10
2015-DecemberCompare behaviouristic and innateness theories10
2015-JuneDiscuss second language acquisition10
2017-JuneProvide a comparative account of behaviouristic and innateness theories10
2017-DecemberExplain stages of language acquisition (A section) + behaviouristic theory (B section)10 + 6
2019-DecemberExplain stages of language acquisition (B section)6
2021-DecemberCompare behaviouristic and innate theory of language acquisition10
2023-JuneDiscuss Chomsky's innateness theory of language acquisition10
2024-JuneDiscuss innateness theory of language acquisition (A) + stages of language acquisition (B)10 + 6

🌟 Comprehensive Answer: Behaviouristic vs Innateness Theory (~500 words)​

Introduction​

Language acquisition — the process by which children develop their first language — has been explained by two major competing theoretical frameworks: the behaviouristic (learning) approach and the nativist (innateness) approach. These theories represent a fundamental debate between nurture (language is learned) and nature (language capacity is innate). The behaviourist account was dominant in the 1950s until Chomsky's devastating critique transformed the field.

Behaviouristic Theory (Skinner, 1957)​

B.F. Skinner in Verbal Behavior (1957) argued that language is acquired through the same mechanisms as any other behaviour — operant conditioning:

  1. Imitation: Children imitate sounds, words, and sentences they hear from caregivers. Imitation provides the raw material for language learning.

  2. Reinforcement: Correct vocalizations (approximations to real words) are positively reinforced by caregivers through praise, attention, and getting what they want. Incorrect forms are extinguished through lack of reinforcement or correction.

  3. Verbal operants: Skinner identified specific types of verbal behavior:

    • Mands: requests ("Milk!" → gets milk = reinforced)
    • Tacts: labeling ("Dog!" when a dog appears = social reinforcement)
    • Echoics: imitation of sounds
    • Intraverbals: verbal responses to verbal stimuli

Strengths: Explains why children learn the language of their environment; accounts for individual variation in vocabulary.

Weaknesses (Chomsky's critique, 1959):

  • Children produce sentences they have never heard ("I goed to school") — imitation cannot account for novel utterances.
  • Language acquisition is too rapid — children acquire complex grammar by age 5 with relatively little explicit correction.
  • Poverty of the stimulus: The input children receive is insufficient (incomplete sentences, false starts, unfamiliar vocabulary) to account for the grammatical competence they acquire.
  • Parents rarely correct grammar systematically — they correct facts, not structure ("No sweetie, say it correctly" is rare).

Innateness / Nativist Theory (Chomsky, 1957, 1965)​

Noam Chomsky proposed that humans are biologically prepared for language acquisition:

1. Language Acquisition Device (LAD) An innate, species-specific cognitive structure that enables children to extract the grammatical rules of any human language from the input they receive. The LAD contains Universal Grammar — the abstract grammatical principles common to all human languages.

2. Universal Grammar (UG) All human languages share deep structural principles (e.g., all have nouns and verbs, all have ways of asking questions, all have recursion). This universality suggests a shared biological basis.

3. Critical Period Hypothesis Language acquisition is most natural during a critical/sensitive period (birth to puberty), after which learning a language to native-like proficiency becomes much more difficult. Evidence: Genie (the "wild child" discovered at age 13) could not acquire full grammatical competence despite intensive instruction.

4. Poverty of the Stimulus Argument The input available to children is insufficient to explain the rich grammatical knowledge they acquire — therefore, grammatical principles must be pre-programmed in the LAD.

Strengths:

  • Explains the universality of language and its rapid, effortless acquisition
  • Accounts for children's ability to generate novel, grammatically correct sentences
  • Consistent with neuropsychological evidence (Broca's area for language production)

Weaknesses:

  • The LAD remains a theoretical construct — its precise neurological basis is not fully identified
  • Does not fully explain how children learn the specific vocabulary and phonology of their language
  • Overstates innateness; social interaction and input quality clearly matter (Tomasello's social-pragmatic approach)

Stages of Language Acquisition​

Children universally pass through these stages:

StageAgeFeatures
Cooing0–2 monthsVowel-like sounds
Babbling4–6 monthsConsonant-vowel combinations (ba-ba, ma-ma)
Holophrastic10–13 monthsSingle words carry full meaning ("Milk" = "I want milk")
Two-word18–24 monthsTelegraphic speech — content words only ("Daddy go", "More juice")
Telegraphic2–3 yearsShort sentences, grammatical function words emerging
Multiword3+ yearsLonger, complex sentences; overgeneralization errors (goed, foots)
Mature grammar5+ yearsNear-adult competence in syntax

Overgeneralization errors (e.g., "I goed home", "He runned") are particularly important — children apply grammatical rules too broadly, demonstrating that they have extracted rules rather than just memorized forms. This is strong evidence against pure imitation/behaviourist accounts.

Comparison Table​

AspectBehaviouristic (Skinner)Innateness (Chomsky)
MechanismImitation + reinforcementLAD + Universal Grammar
Language isLearned behaviorBiologically programmed
Input neededExtensive, reinforced inputImpoverished input sufficient
Child's rolePassive recipientActive hypothesis tester
UniversalityDue to similar environmentsDue to shared LAD
Novel sentencesCannot explainExplained by UG + LAD
WeaknessCannot explain noveltyLAD neurologically vague

Conclusion​

The debate between behaviourist and nativist accounts has been productive — driving research into the mechanisms of language acquisition from both biological and environmental perspectives. Contemporary interactionist accounts (e.g., Tomasello's social-pragmatic approach) recognize that both innate capacities and rich social input are necessary for full language development. Neither position alone is sufficient.

Related Content:

🧠 Memory Aids​

Skinner's Verbal Operants — "METI": Mands, Echoics, Tacts, Intraverbals

Chomsky's key concepts — "LAD-UG-CP": LAD, Universal Grammar, Critical Period

Stages — "CB-H-T-T-M": Cooing → Babbling → Holophrastic → Two-word → Telegraphic → Mature

✅ Self-Assessment​

  1. What are Skinner's four types of verbal operants?
  2. What is the "poverty of the stimulus" argument?
  3. What evidence supports the critical period hypothesis for language?
  4. What are overgeneralization errors? Why are they important for theory?
  5. How do behaviouristic and nativist accounts differ on the role of reinforcement?