The measurement and diagnostic utility of intrasubtest scatter in pediatric neuropsychology

Abstract

Intrasubtest scatter (ISS) is a measure of person's tendency toward inconsistency when responding to test items. It has been claimed that ISS may be suggestive of intellectual inefficiency, difficulty with recall of specific information, or fluctuating levels of arousal/attention. The research investigating these claims has been inconclusive, possibly because traditional indices of ISS may not adequately measure inconsistent responding. Item Response Theory (IRT) approaches to the detection of unusual response sequences appear to have a much firmer psychometric foundation but have been largely ignored in the neurodiagnostic literature. This study compares the utility of traditional and IRT-b..