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Direct linkGrasby, Katrina L.; Byrne, Brian; Olson, Richard K. – Australian Journal of Education, 2015
Each year, all Australian students in grades 3, 5, 7 and 9 sit nationwide large-scale tests in literacy and numeracy which have their validity frequently questioned. We compared the performance of grade 3 twins on these large-scale reading tests with their performance on three individually administered literacy tests in comprehension, word reading…
Descriptors: Foreign Countries, National Competency Tests, Numeracy, Literacy
Betjemann, Rebecca S.; Keenan, Janice M.; Olson, Richard K.; DeFries, John C. – Scientific Studies of Reading, 2011
Does the choice of test for assessing reading comprehension influence the outcome of genetic analyses? A twin design compared two types of reading comprehension tests classified as primarily associated with word decoding (RC-D) or listening comprehension (RC-LC). For both types of tests, the overall genetic influence is high and nearly identical.…
Descriptors: Reading Comprehension, Listening Comprehension, Siblings, Genetics
Pennington, Bruce F.; McGrath, Lauren M.; Rosenberg, Jenni; Barnard, Holly; Smith, Shelley D.; Willcutt, Erik G.; Friend, Angela; DeFries, John C.; Olson, Richard K. – Developmental Psychology, 2009
This article examines Gene x Environment (G x E) interactions in two comorbid developmental disorders--reading disability (RD) and attention-deficit/hyperactivity disorder (ADHD)--as a window on broader issues on G x E interactions in developmental psychology. The authors first briefly review types of G x E interactions, methods for detecting…
Descriptors: Reading Difficulties, Attention Deficit Hyperactivity Disorder, Interaction, Developmental Psychology
Olson, Richard K. – Scientific Studies of Reading, 2004
Environment and Genes are often found in the titles of my articles, but this is the first and most likely the last of my titles to include SSSR. This article is based on my presidential address at the 10th annual meeting of the Society for the Scientific Study of Reading (SSSR) in Boulder, Colorado (2003), so I begin with some reflection on the…
Descriptors: Environmental Influences, Genetics, Reading Difficulties, Reading Research
