In this article, I describe the 21 ideas underlying a 42-year search to understand giftedness. I present the ideas roughly chronologically, in the order in which they arose, and discuss how in a career as in science, progress means supplementing or even superseding one idea with the next. In terms of the 21 ideas, I start with a discussion of how…

Research in science education has referred to limitations in information processing resulting from both mental capacity and working memory capacity. Mental capacity is often conceptualised within the framework of the theory of constructive operators. However, the cognitive resources underlying working memory are not well specified within the…

Valid assessment with diverse populations requires tools that are not influenced by cultural elements. This study investigated the relationships between culture, information processing efficiency, and general cognitive capacities in samples of Caucasian and Mexican American college students. Consistent with the neural efficiency hypothesis,…

Processing speed subtests are components of widely used intellectual assessment instruments. Many researchers interpret these measures as assessing a unitary construct, but there is a question concerning the constructs assessed by these measures and, ultimately, their interpretative utility. Coding and Symbol Search from the Wechsler Intelligence…

The cognitive styles, aptitudes, and abilities of 50 right-handed subjects were measured through a battery of paper-and-pencil tests to determine the feasibility of using event related brain potentials (ERPs) in the development of adaptive training techniques keyed to the information processing styles of individual students. Visual, auditory, and…