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This study proposed to evaluate the appropriateness of selected subtests of the Stanford-Binet Intelligence Scale: Fourth Edition (SB:FE) for use with severely to profoundly hearing impaired children. The subjects used in this study were enrolled in a residential/day school for the deaf whose educational methodology was Total Communication. The subjects were tested on both the SB:FE nonverbal selected subtests and the Performance Scale of the Wechsler Intelligence Scale for Children-Revised (WISC-R PIQ). To assess appropriateness, several procedures were employed comparing data gathered from the hearing impaired sample with data reported for the standardized population of the SB:FE. Correlations were computed between the WISC-R and the SB:FE and comparisons of the total composite scores for each measure were made to detect any systematic differences. The results indicated that the correlations reported for the hearing impaired sample are generally similar to the correlations reported for the standardized sample of the SB:FE. The analysis performed between the Area Scores of the SB:FE and the WISC-R PIQ to detect systematic differences revealed a difference of one standard deviation between these two instruments, with the. SB:FE results being lower than the WISC-R PIQ results. It was concluded that the selected subtests of the SB:FE and the WISC-R PIQ could not be used interchangeably. Further research into this area was advised before using this measure to estimate general cognitive ability for hearing impaired children whose levels of language development may be delayed. Further research was also encouraged to confirm the suggestion of greater predictive validity of the SB:FE with academic measures. It was suggested that these findings indicated that the use of language as a cognitive tool may be important in acquiring certain problem solving skills. / Education, Faculty of / Educational and Counselling Psychology, and Special Education (ECPS), Department of / Graduate

The purpose of the present study was to determine if African American and Caucasian preschool children displayed similar patterns of performance among the Cattell-Horn-Carroll (CHC) factors measured by the Kaufman Assessment Battery for Children, Second Edition (KABC-II). Specifically, a profile analysis was conducted to determine if African Americans and Caucasians displayed the same patterns of highs and low and scored at the same level on the KABC-II composites and subtests. Forty-nine African American (mean age = 59.14 months) and 49 Caucasian (mean age = 59.39) preschool children from a Midwestern City were included in the study and were matched on age, sex, and level of parental education. Results of a profile analysis found African American and Caucasian preschool children had a similar pattern of highs and lows and performed at the same level on the CHC broad abilities as measured by the KABC-II. Comparison of the overall mean IQ indicated no significant differences between the two groups. The overall mean difference between groups was 1.47 points, the smallest gap seen in the literature. This finding was inconsistent with previous research indicating a one standard deviation difference in IQ between African Americans and Caucasians. A profile analysis of the KABC-II subtests found the African American and Caucasian groups performed at an overall similar level, but did not show the same pattern of highs and lows. Specifically, Caucasians scored significantly higher than African Americans on the Expressive Vocabulary subtest which measures the CHC narrow ability of Lexical Knowledge. Results of this study supported the KABC-II’s authors’ recommendation to make interpretations at the composite level. When developing hypotheses of an individual’s strengths and weaknesses in narrow abilities, clinicians should be cautious when interpreting the Expressive Vocabulary subtest with African Americans. Overall, results of this study supported the use of the KABC-II with African American preschool children. When making assessment decisions, clinicians can be more confident in an unbiased assessment with the KABC-II. Future research could further explore the CHC narrow abilities in ethnically diverse populations. Additionally, more research should be conducted with other measures of cognitive ability designed to adhere to the CHC theory, and the appropriateness of those tests with an African American population. Furthermore, future research with the KABC-II could determine if the results of the present study were replicated in other age groups. / Department of Educational Psychology

This study investigated the relationship between the Wechsler Adult Intelligence Scale-Revised (WAIS-R) and the Stanford-Binet Intelligence Scale: Fourth Edition (SBIV) in a brain-damaged adult sample. The sample in this study was composed of 30 adult patients at two residential treatment programs who completed comprehensive psychological evaluations between August, 1986 and November, 1987. Each patient was administered both the WAIS-R and the SBIV as part of these evaluations. Data gathered in this study was submitted to Pearson product moment correlational statistical procedures. Significant correlations were found in the following pairs of summary scores: the SBIV Test Composite Standard Age Score (SAS) and the WAIS-R Full Scale IQ; the SBIV Abstract/Visual Reasoning Area SAS and the WAIS-R Performance IQ; the SBIV Quantitative Reasoning Area SAS and the WAIS-R Verbal Scale IQ; the SBIV Verbal Reasoning Area SAS and the WAIS-R Verbal Scale IQ; the SBIV Short-Term Memory Area SAS and the WAIS-R Verbal Scale IQ; and the SBIV Short-Term Memory Area SAS and the WAIS-R Full Scale IQ. Significant correlations were also found in the following pairs of individual subtest results: the SBIV and WAIS-R Vocabulary subtests; the SBIV Memory for Digits subtest and the WAIS-R Digit Span subtest; the SBIV Pattern Analysis subtest and the WAIS-R Block Design subtest; and the SBIV Paper Folding and Cutting subtest and the WAIS-R Picture Arrangement subtest. Directions for future research were also suggested upon review of the subtest correlation matrix and the descriptive statistics of data generated.

The purpose of this study was to determine if distinct subgroups of high achieving children could be identified using a recently redeveloped intelligence measure—The Woodcock-Johnson Tests of Cognitive Ability, 3rd edition (WJ-III). Students were referred for further testing based on their scores on the Indiana State Test of Educational Progress (the ISTEP+). Students were included in the study if they scored at or above the 90th percentile on the ISTEP+ Cognitive Skills Index, or the reading and/or math portions. Using these criteria, 202 students were referred for further testing. These students were clustered with Ward's method of cluster analysis using their scores on the seven CHC factors of the WJ-III. Their individual scores on two other intelligence measures (the Stanford-Binet IV and the Kaufman Brief Intelligence Test), as well as other scores from the WJ-III were used to further describe the clusters that emerged. The following three subgroups were identified: (a) decidedly gifted, (b) problem solvers, and (c) slow-paced achievers. Not all subgroups obtained the gifted score ranges expected on the three measures employed. The clusters were better described as displaying a slight levels effect, in that the groups were most different from one another in terms of the overall intelligence quotient and mean CHC factor scores, with one group scoring in the superior to high average ranges, one in the high average to average ranges, and one in the average range overall. This study provided evidence for the use of intelligence measures in describing gifted individuals' specific strengths and weaknesses. It also has significant implications for the use of intelligence measures in assessing giftedness within an applied setting. This study is useful as a validation study for the three intelligence measures employed. / Department of Educational Psychology

The purpose of this study was to investigate the stability of Wechsler Intelligence Scale for Children-III (WISC-III) test scores in children with Learning Disabilities. Previous research has suggested that some children with Learning Disabilities do not demonstrate the same stability of performance, over time, on the Wechsler as many children in the general population.The sample utilized in this study consisted of 214 children who had been identified as having Learning Disabilities. WISC-III data was collected through archival review of education files.Test-retest stability for the WISC-III over a period of approximately three years was assessed using correlational and t-test data. For the total sample, three year test-retest correlations for the Verbal IQ, Performance IQ, and Full Scale IQ were .67, .73, and .74, respectively. However, Verbal IQ, Full Scale IQ, and Verbal Index scores were observed to drop significantly between testings. Mean score differences for the Verbal IQ and Verbal Comprehension scales were slightly over three points. The mean difference for the Full Scale IQ was slightly less than two points.Analysis of individual scores indicated considerable variability, with some students decreasing as much as 30 or increasing as much as 37 IQ points at the time of retesting. Analysis of distribution of score differences suggested that the children with Learning Disabilities in this sample demonstrated more variability in performance, overall, than might be anticipated in the general population. / Department of Educational Psychology

Measurement of the abilities of gifted children is challenging. Identifying patterns of performance for gifted children has proven elusive. The WJIII COG, a theory-driven measure, purports to provide information about a child's pattern of abilities, including areas previously not measured by other cognitive instruments. Only one study has addressed the relationship between the WJIII COG and gifted children. (Rizza, et al., 2001) The purpose of this study was to examine the WJIII COG's appropriateness for use with gifted children. Interpretive guidance when using the WJIII COG with gifted children was sought. The following question was addressed: Do children of high intellectual ability display distinct patterns of performance on the WJIII COG Stratum II variables. If so, do these patterns qualitatively differ from the performance of children of non-high intellectual ability?The participants for this study were taken from the standardization sample of WJIII COG participants (N= 3,145). The participants were divided into two groups: high intellectual ability, Group 1 (N = 389), and "other," (Group 2) (N = 2756). Group 1 participants had a GIA Standard score of 120 or above. The participants were further divided into three subgroups, determined by age: preschool, school-aged, and collegeaged. Approximately half of the sample was male. White participants were the majority of the sample (77.4 - 87.9%). Most participants were non-Hispanic (91.3 - 94.9%). Means, standard deviations, ranges, minimum values, and maximum values, were obtained. WJIII COG Stratum II variables were paired and compared. The comparisons made were ranges and point differences. Cumulative percentages of point differences were calculated at the 5, 7, 10, 15, 20, 25, 30 point levels.Two primary findings emerged. The first finding was that Group 1 participants scored higher overall than Group 2 participants when averages were compared. The second finding was that no gifted profile emerged for Group 1. Although no gifted pattern emerged, there was a great deal of variability within individual student profiles for both Groups. It was suggested that further research be directed at whether subtypes of students with high abilities could be identified that would have clinical implications congruent with multidimensional theories of giftedness. / Department of Educational Psychology

The present study compared three commonly used cognitive screeners: the Test of Cognitive Skills – Second Edition (TCS-2), the Kaufman Brief Intelligence Test (K-BIT), the Wide Range Achievement Test – Third editions (WRAT3) and the impact of marijuana use on these screeners in a population of juvenile delinquents. One hundred records (67 males and 33 females) were selected from archival data at the Allen County Juvenile Center. Results from this study found, that as predicted, individuals who tested positive for marijuana performed significantly worse on all subtests of the TCS-2, on the Verbal and Composite Score of the K-BIT, and the Spelling subtest of the WRAT3 than individuals who tested negative for marijuana use. The results of this study support the notion that marijuana can impair cognitive abilities in a group of adolescents. / Department of Psychological Science

[Truncated abstract] Intelligence in children increases with age until adult levels of performance are achieved. Dempster (1991) proposed that developmental changes in inhibitory processes underpin these changes in the development of intelligence. The evidence Dempster presented to support this thesis typically takes the form of noting changes in inhibitory performance that occur in the same time frame as changes in psychometric intelligence (Dempster, 1991, 1992, 1993; Dempster & Corkill, 1999). He also provides correlational evidence from studies in which intelligence scores are correlated with various inhibitory measures. One problem with much of the evidence presented by Dempster is that it does not distinguish between developmental and individual differences in inhibition and/or intelligence. Developmental differences are differences in performance between children at different ages. Individual differences are differences in performance between children of the same age. The majority of evidence Dempster provides concerns individual differences in inhibition and the relationship of these differences to intelligence rather than the relationship of any developmental differences to intelligence. Anderson (1987) suggests that the processes underpinning these two types of differences are not necessarily the same. For example, individual differences may be related to speed of processing, while developmental differences may be related to changes in inhibitory ability. Therefore, a more accurate test of Dempster’s thesis is to assess whether developmental changes in inhibition are related to developmental changes in intelligence, rather than whether individual differences in inhibition are related to intelligence. This was the primary goal of this thesis. A secondary goal was to address whether or not any developmental changes seen were primarily due to changes in inhibition or could be accounted for by changes in speed of processing. Measures which utilise difference score reaction time (RT) measures as inhibitory indices such as the stroop task do not typically account for this potential confound. A number of researchers have addressed this problem of difference score measures and proposed alternative analytic techniques (Christ, White, Mandernach, & Keys, 2001; Christ, White, Brunstrom, & Abrams, 2003; Faust, Balota, Spieler & Ferraro, 1999). Each inhibitory measure used in the current study will attempt to control for group and individual speed differences, either by utilising one of these alternative techniques or using regression analysis to identify the contribution of speed to the developmental shift in intelligence.

M.A. / The educational and psychometric contexts in South Africa are currently characterised by concerns pertaining to the potentially spurious influence of the challenges of cultural heterogeneity and of the redress of past and present disadvantagement. The present investigation forms a research response to these challenges as they relate to the practical utility of a dynamic assessment measure for the purpose of selecting students for curricula at a South African university. In response to a growing dissatisfaction with longstanding selection procedures and instruments, the utility of a dynamically derived learning potential score is explored and contrasted with the traditionally employed static intellective measure of the matriculation score. The present investigation serves to augment a growing body of research that asserts the capacity of dynamic assessment to surmount many of the criticisms typically associated with static assessment and to contribute novel and useful information regarding the intellective faculties of prospective university students. Within the context of the investigation 71 first year students enrolled for the BA Extended Degree at the University of Johannesburg were assessed using the static intellective measure of a matriculation score and the dynamically informed global learning potential score of the Ability, Processing of Information and Learning Battery Short Version (APIL-B SV). The utility of the dynamically derived learning potential score to predict academic performance during the first year of university study was examined and contrasted with the predictive efficacy of the static matriculation score. The empirically examined data served to support conjecture that a dynamic intellective measure demonstrated significant utility in predicting the future academic performance of first year university students. In addition, the ability of this measure to predict academic performance in a manner that had significant benefit over the traditionally employed static matriculation score was affirmed.