Related Experiment Video
Updated: Aug 6, 2026

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
Published on: June 3, 2020
Twin resemblances in cognitive abilities in an Egyptian sample
A R Abdel-Rahim1, C T Nagoshi, S G Vandenberg
1Faculty of Education, Minia University, Egypt.
Abstract:
Thirty-six pairs of monozygotic (MZ) twins, 24 pairs of same-sexed dizygotic (DZ) twins, and 33 pairs of opposite-sexed DZ twins 12 to 19 years of age were tested in Minia, Egypt, on a battery of cognitive abilities tests. For most of the tests and composite scales, DZ resemblances were higher than typically found in Western samples and not significantly different from MZ resemblances. MZ resemblances were generally lower than typically found in Western samples. These results were discussed in terms of the influence of cross-cultural differences in degree of social stratification and assortative mating.
Related Concept Videos
Reason and Intuition
The Representativeness Heuristic
Language and Cognition
Intelligence
Measures of Intelligence
Validity refers to how well a test measures what it claims to measure. An intelligence test should accurately assess intelligence rather than another characteristic, like anxiety. Criterion validity is one way to evaluate this; it...
Biological Influences on Intelligence

