Page 2: Case Studies and Cognitive Theory
This page delves into case studies and cognitive theory related to child language acquisition.
The Genie case study is presented as an example of the critical period hypothesis in language acquisition:
- Genie was abused and isolated from birth to 13 years old
- She experienced no communication except barking and growling
- When rescued, she only knew her name and "sorry"
- Despite an enriched learning environment, she was unable to achieve full language acquisition
- Her language development was limited to the two-word stage and about 100 words
Highlight: The Genie case study demonstrates the importance of early language exposure and the potential consequences of missing the critical period for language acquisition.
Berko's Wug Test is introduced as a method to test children's knowledge of morphology:
- The test shows that children learn language patterns, not just repetition
- Children can apply language rules to nonsense words (e.g., "one wug, two wugs")
Example: In the Wug Test, children are shown a picture of a made-up creature called a "wug" and asked what two of them would be called, demonstrating their ability to apply plural rules to unfamiliar words.
The page also outlines Piaget's cognitive theory, which describes four stages of cognitive development:
- Sensorimotor stage (0-2 years)
- Preoperational stage (2-7 years)
- Concrete operational stage (7-11 years)
- Formal operational stage (11-13 years)
Definition: Object permanence is the understanding that objects continue to exist even when they cannot be seen, heard, or touched, typically achieved during the sensorimotor stage.





