Objective: To discuss the developmental trend of late-signer deaf children’ s theory of mind and its related factors. Methods: 117 late-signer deaf children at the age of 11-16 were tested by false-belief tasks. Results: ①The majority of 14-year-old deaf children couldn’ t own theory of mind, but the 15-year-old ones could it. ②Among the deaf children of the same age, the higher grade they were in, the better state their theory of mind would be. ③Girls’ scores were higher than boys’ on Unexpected Location Task. Conclusion: The important period of theory of mind is 15; education year and gender would affect the development of late-signer deaf children’ s theory of mind.
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