Trends in the measurement of intelligence

On the assumption that an understanding of the past provides a guide to the future, analyses are directed at explicating major trends of the last 25 years in the scientific study of intellectual abilities. Five major trends are identified. These suggest that in the future several kinds of tests will be used to measure several kinds of basic processes of intelligence; there will be a corresponding decrease in concern to measure a single attribute of general intelligence. There will be emphasis in measuring complex learned capacities of a kind that characterizes adult thinking, in contrast to tests desinged for school children. Test items will be presented through the computer, on TV screens, and in ways that permit the individuals' responses to determine which items will follow; responses, including time to respond, will be gathered in the computer and there converted to scores.     

A rationale and test for the number of factors in factor analysis

It is suggested that if Guttman's latent-root-one lower bound estimate for the rank of a correlation matrix is accepted as a psychometric upper bound, following the proofs and arguments of Kaiser and Dickman, then the rank for a sample matrix should be estimated by subtracting out the component in the latent roots which can be attributed to sampling error, and least-squares capitalization on this error, in the calculation of the correlations and the roots. A procedure based on the generation of random variables is given for estimating the component which needs to be subtracted.I wish to acknowledge the valuable help given by J. Jaspers and L. G. Humphreys in the development of the ideas presented in this paper.     

Phonetically inaccurate spelling among learning-disabled, head-injured, and nondisabled young adults

We applied the Boder and Jarrico (1982, The Boder Test of Reading-Spelling Patterns, New York: Grune & Stratton) criteria to the WRAT spelling list and examined the phonetically inaccurate spelling error patterns of learning-disabled (LD), head-injured (HI), and nondisabled young adults. Phonetically inaccurate (PI) errors were reliably rated (interrater r = .94) and were correlated significantly more strongly with dysphasic errors (r = .33) than with dyscopia (r = .16). ANOVA showed that LD and HI, which did not differ, made significantly more PI errors than both nondisabled and HI. These results indicate that PI errors reflect an underlying language disorder. The results also suggest that PI errors are more frequent in brain-related disorders. Finally, when group differences in cognitive ability are statistically controlled, PI errors are more common only among LD persons.     

Fast and slow namers: benefits of segmentation and whole word training.

Poor readers in Grade 2 (mean age 7 years 7 months) were categorized into fast and slow namer groups based on their performance on a Rapid Automatized Naming (RAN) task. The fast and slow groups were then trained to read words using 3 different training regimes: one that taught onset/rime segmentation, one that taught phonemic segmentation, and one that used whole word repetition. The main results were that the slow namers acquired the words more slowly across experiences than the fast namers, irrespective of training condition, but they were particularly disadvantaged when trained with word-level units. Unlike beginning nonreaders, poor Grade 2 readers showed poorer retention following onset/rime training compared with phoneme or word level training, even when final level of learning was controlled. Further, they showed the best generalization to reading new words and nonwords following phoneme training and the worst following whole word training, even when final level of acquisition was controlled. The data are related to the P. G. Bowers and M. Wolf (1993, Reading and Writing, 5, 69-85) double-deficit hypothesis and to the specific deficits associated with early reading failure.     

Scaling a motor skill through observation and practice

The authors examined the proposal that a motor skill is scaled through physical practice and not through observation of a model. In 4 groups, participants (N = 32) did or did not imitate a model bowling a ball to a target 8 m away. In an assessment phase, those groups did or did not observe the same model bowling a ball to a target 4 m away. Participants who viewed a model in the assessment phase were more accurate and consistent in terms of bowling accuracy than were those who did not. Their shoulder and wrist velocity profiles were more similar to those of the 4-m model than were those of the no-model group. Participants who had previous practice and viewed a demonstration were more accurate at scaling the wrist of the bowling arm. Observing a demonstration facilitates the acquisition of control-related features of a movement. Furthermore, early acquisition of coordination aids the use of velocity information for scaling the endpoint of the primary effector.     

Infants and Young Children in Military Families: A Conceptual Model for Intervention

Infants and young children of parents in the military deserve special attention because the first years of life are pivotal in establishing trusting attachment relationships, which are based on the developmental expectation that parents will be reliably available and protective both physically and emotionally. For young children in military families, the stresses of extended absences of mothers and/or fathers as the result of deployment abroad, recurrent separations and reunions resulting from repeated deployments, or parents struggling with the emotional sequelae of their war experiences, and the traumatic impact of parental injury and death can strain and derail the normative expectation of parental availability and protectiveness. This article describes the key features of mental health in infancy and early childhood, the developmentally expectable early anxieties that all children experience in the first years of life across cultures and circumstances, and the ways in which these normative anxieties are exacerbated by the specific circumstances of military families. The article also describes interventions that may be helpful in supporting military families and their children with the specific challenges they face.