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Group Differences in Nonverbal Intelligence: Support for the Influence of Spearman’s g

Harrison Kane

Published: 2007/09/01

Abstract

The Universal Nonverbal Intelligence Test (UNIT; Bracken & McCallum, 1998) is standardized, norm referenced measure of intelligence that requires only universal hand gestures from the examiner and examinee. The UNIT was constructed in order to measure the cognitive abilities of children who may be disadvantaged by more traditional intelligence tests, which typically emphasize receptive and expressive language abilities. In the present study, standardization data from the UNIT is examined to identify group differences in performance. Despite its novel nonverbal format and response demands, group differences are identified. Subsequent analysis confirms the substantial influence of Spearman’s g in explaining these observed group differences.

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