The extent to which a test's time limit alters a test taker's performance is known as speededness. The manifestation of speededness, or speeded behavior on a test, can be in the form of random guessing, leaving a substantial proportion of test items unanswered, or rushed test-taking behavior in general. Speeded responses do not depend solely on a…

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…