Despite historical emphasis on "specific" learning disabilities (SLDs), academic skills are strongly correlated across the curriculum. Thus, one can ask how specific SLDs truly are. To answer this question, we used bifactor models to identify variance shared across academic domains (academic "g"), as well as variance unique to…

This study investigated the extent to which standardized reading performance, individual perceptions of reading and test taking skills, and test anxiety predict the amount of extended time needed to equalize test access for college students with disabilities. Thirty-seven college students with a specific learning disorder (LD) and/or an attention…

Many studies of school achievement find a significant association between reading and arithmetic achievement. The magnitude of the association varies widely across the studies, but the sources of this variation have not been identified. The purpose of this paper is to examine the magnitude and determinants of the relation between arithmetic and…

Turner syndrome is a common disorder with a prevalence of 1:2,500 live female births. Although not associated with mental retardation, there is an increased risk of learning difficulties in this population. In particular, mathematical learning difficulties among girls with Turner syndrome are prevalent, significant, and persistent. As such, the…

Eighty-five fourth- and eighth-grade learning disabled students whose individualized education plans specified untimed achievement testing were tested with the Reading Comprehension subtest of the Iowa Tests of Basic Skills, either according to the publisher's 40-minute time limit or with an extended time limit of 2 hours, 30 minutes. Results were…