The purpose of the present research was to examine characteristics of the self-understanding of adults with mental retardation, using their own self-descriptions, rather than alternative questions or a multiple-choice format. Participants were 24 adults with mental retardation (15 men, 9 women; average age, 24.2; age range, 16.9-45.0), and 64 adults without mental retardation (34 men, 30 women) of the same average chronological age (average age 24.9; range, 16.6-46.3). Compared to the adults without mental retardation, the participants with mental retardation found it more difficult to answer all the questions about their self-understanding, especially the questions about what they liked, what they disliked, and their self-definition ("Who am I?"). However, they were able to answer easily questions about their good points and bad points, which indicates some progress in self-understanding. No significant differences were found when the participants with mental retardation were divided by gender or chronological age (higher and lower), but the group with higher mental age (8-13 years) could understand the questions about their dislikes more easily than could the group with lower mental age (6-7 years).
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