Two experiments demonstrate that individual differences among normal adult readers, including lexical quality, are expressed in silent reading at the word level. In the first of two studies we identified major dimensions of variability among college readers and among words using factor analysis. We then examined the effects of these dimensions of…

Finds that parent-offspring resemblance in families of reading-disabled probands does not differ substantially from that in families of controls; and correlations and regressions for monozygotic twins are greater than those for dizygotic twins, suggesting that individual differences in reading achievement are due in part to heritable influences.…

This study examined the effects of extra time on the reading comprehension performance of a heterogeneous group of adults with reading disabilities. Sixty-four adults participated. A clinic that assesses learning disabilities identified 22 as reading disabled, and 42 as normal readers. The 64 adults took a reading comprehension test under both…