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STAGES O
F FIR
ST
LANGUAGE A
CQUISIT
ION
DR
. C
OM
F OR
T P
RA
T T
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STAGES OF FIRST LANGUAGE DEVELOPMENTAge Accomplishment Examples
0-2 months Crying (express hunger and discomfort)
2-4 months Cooing (express satisfaction or pleasure) aaa, ooo
4-9 monthsBabbling, gurgling, changing to echolalic babbling
gagaga, mamamama
9-18 months
One-word utterances; refer to people and objects in baby’s life
juice; mama
18 months—2 ½ years
Two-word utterances; the beginning of syntax, expanding to three-word utterances; allows for more communicative functions (commenting, negating, requesting, & questioning)
more juicejuice fall down
Daddy go?
2 ½ years —4 years
Telegraphic Stage (S-V-O): Expanded syntax and vocabulary; omit key grammatical markers and function words
I eated bread
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DEVELOPMENTAL SEQUENCESStages are universal.
Year 1 – Involuntary crying when they are
hungry or uncomfortable Babbling and gurgling Can distinguish between sounds
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DEVELOPMENTAL SEQUENCES
1 yr.
2 yrs.
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STAGES OF LANGUAGE DEVELOPMENT
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EMERGENCE AND DEVELOPMENT OF LANGUAGE FEATURES♣ Universal♣ Related to children’s cognitive
development♣ No temporal adverbs until they
develop a sense of time (tomorrow, last week)
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STAGES OF ACQUISITION OF GRAMMATICAL MORPHEMES
Roger Brown et al. (1973) did a longitudinal study of three children –Adam, Eve and Sarah
Jill & Peter de Villiers (1973) confirmed it in a cross-sectional study of 21 children
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STAGES OF ACQUISITION OF GRAMMATICAL MORPHEMES
Order of acquisition
1. Present progressive
2. Plural
3. Irregular past forms
4. Possessive
5. Copula
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STAGES OF ACQUISITION OF GRAMMATICAL MORPHEMES
♣6. Articles ♣7. Regular past ♣8. Third person singular simple present ♣9. Auxiliary
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EARLY SENTENCE PRODUCTION
When?
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DEVELOPMENT OF SENTENCE PRODUCTION
STAGE I
Example Communicative Intent
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DEVELOPMENT OF SENTENCE PRODUCTION
STAGE II
Form Example
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DEVELOPMENT OF SENTENCE PRODUCTION
STAGE IIIForm Example
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DEVELOPMENT OF SENTENCE PRODUCTION
STAGE IVForm Example
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DEVELOPMENT OF SENTENCE PRODUCTION
STAGE VForm Example
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CRITIC
AL PERIO
D
HYPOTH
ESIS
DR
. C
OM
F OR
T P
RA
T T
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CRITICAL PERIOD HYPOTHESIS
Lenneberg
Some experiments:
Victor
Genie
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CRITICAL PERIOD HYPOTHESIS
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CRITICAL PERIOD HYPOTHESIS
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THE END