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The Test Of Non-Verbal Intelligence-4 (TONI-4)

The TONI-4 is a test of non-verbal intelligence that measures the abstract reasoning function without necessitating prior existing knowledge for completion. It is not timed and it can be administered within 20 min. It has been normed on a variety of special needs and particularly in individuals with autism (Edelson et al., 1998a, Edelson et al., 1998b). A lesser reliability factor of 0.6 was found for this special population, consecutively to issues of ADHD, and autistic behavioural presentation. It was found that ADHD more particularly was affecting reliability compared to level of autistic features.