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Foorman, Barbara R.; Petscher, Yaacov; Bishop, M. Denise – Learning and Individual Differences, 2012
We know that knowledge of word structure--morphology--relates to reading, but there is limited research on its unique contribution to reading comprehension, especially with students in middle and high schools and with the nesting of students within classrooms taken into account. In this study with 4780 students in grades 3 to 10, we examined how…
Descriptors: Academic Achievement, Reading Comprehension, Morphology (Languages), Spelling
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Wicherts, Jelte M.; Dolan, Conor V.; Carlson, Jerry S.; van der Maas, Han L. J. – Learning and Individual Differences, 2010
In his comment on our literature review of data on the performance of sub-Saharan Africans on Raven's Progressive Matrices, Lynn (this issue) criticized our selection of samples of primary and secondary school students. On the basis of the samples he deemed representative, Lynn concluded that the average IQ of sub-Saharan Africans stands at 67…
Descriptors: Legislators, Academic Achievement, Intelligence Quotient, Foreign Countries
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Geiser, Christian; Lehmann, Wolfgang; Corth, Martin; Eid, Michael – Learning and Individual Differences, 2008
This study investigated quantitative and qualitative changes in mental rotation performance and solution strategies with a focus on sex differences. German children (N = 519) completed the Mental Rotations Test (MRT) in the 5th and 6th grades (interval: one year; age range at time 1: 10-11 years). Boys on average outperformed girls on both…
Descriptors: Females, Gender Differences, Males, Elementary School Students