Use of the WISC-R and K-ABC with learning disabled,borderline mentally retarded,and normal children

The aim of this investigation was to examine normal (N = 34), learning disabled (N = 34), and borderline mentally retarded (N = 33) children's performance on the WISC-R and K-ABC. Results revealed no significant differences between the WISC-R Full Scale IQ and K-ABC Mental Processing Composite by group (F = 0.7, p > .15). The Full Scale IQ and Mental Processing Composite standard score correlated .85 for the entire sample, and all other subscale correlations ranged from .65 to .90 (all significant at p < .001). Analysis of Verbal-Performance, Mental Processing-Achievement, and Simultaneous-Sequential discrepancy means by group revealed no significant differences in comparison to normative values. Subtest patterns analysis revealed high rank order correlations between the learning disabled and mentally retarded groups, but lower correlations between the exceptional and normal groups. Implications of these findings are discussed.     

Academic self-concept in elementary learning disabled children: Study with the student's perception of ability scale

Academic self-concept as measured by the Student's Perception of Ability Scale (SPAS) was compared for 81 learning disabled (LD) and 81 normally-achieving control children in grades three to six. The results show that LD children hold significantly more negative self-perceptions of ability in reading, spelling, and arithmetic than do the control children. Further, these negative school subject-related attitudes in the LD children had generalized to lower self-perceptions of ability in general, to expressions of less confidence in school, and more negative attitudes toward school. No grade level or sex effects were observed. It was concluded that the SPAS is able to discriminate between normally-achieving children and those experiencing problems in school, and, accordingly, that the SPAS has good external validity. The results were discussed in terms of using the SPAS for evaluating affective components of remediation, and for identifying high-risk elementary school children. Continuing external validity studies being undertaken by the authors also were noted.     

Stress and teachers of the learning disabled,behavior disordered,and educable mentally retarded

This study investigated which factors related to the professional roles of teachers of the learning disabled (LD), behavior disordered (BD), and educable mentally retarded (EMR) are most stressful, and which activities, both personal and professional, are beneficial in guarding against stress. The Special Teacher Response to Environmental Stressors (STRESS) was used to elicit responses from the 135 teachers who participated in the study. The participants rated as highly stressful legal concerns, lack of administrative and peer support, and lack of support services. In particular, teachers of the BD revealed that they were fearful of verbal and physical attacks from their students. The participants rated highly exercise and outdoor programs, confiding in significant others (i.e., wife or husband), and peer support as helpful in guarding against stress.     

Teachers' perceptions of criteria for identifying learning disabled students

A national sample of 118 teachers of learning disabled (LD) students described their school districts' criteria for identifying LD students and indicated their agreement or disagreement with the criteria. Reported criteria were characterized by variability, even within states, as were the teachers' stated agreement or disagreement with them. Implications of the continuing definitional crisis in the area of learning disabilities are explored.     

Construct validity of the Kaufman assessment battery for children with learning disabled and mentally retarded

This study investigated the construct validity of the Kaufman Assessment Battery for Children (K-ABC) via correlational procedures with the WISC-R. Thirty-two special population children selected from kindergarten through grade five participated in the study; 19 children were diagnosed as learning disabled, 13 as educable mentally retarded. A high relationship between the WISC-R FSIQ and the K-ABC Mental Processing composite revealed evidence of construct validity in the measurement of intelligence. The K-ABC diagnosed the learning disabled but failed to diagnose the mentally retarded children. The K-ABC Sequential Processing Scale appeared to offer a unique construct (analytic, temporal sequencing) not measured by the WISC-R. Implications for the usefulness of the K-ABC are discussed.     

Computational errors of mentally retarded students

This study examined the computational errors made by 370 educable mentally retarded students on the arithmetic subtest of the Wide Range Achievement Test. There were 233 males and 137 females in the sample, and the ages ranged from 8 to 18. Engelhardt's (1977) error classification was used to identify error types. Retarded students had a lower percent of grouping and inappropriate inversion errors and a higher percent of incorrect operation errors than regular students had in Engelhardt's study.     

Psychometric classifications of learning disabled students

The psychometric test results of a sample of 100 LD students with severe achievement problems were cluster analyzed. The variables included in this analysis were the subtests of the WISC-R, the Bender Gestalt, the Benton Visual Retention, the Purdue Perceptual-Motor, and the Lindamood Auditory Conceptualization tests. Using K-means iterative clustering procedures, three clusters were obtained. The first cluster was defined by low scores on attention and concentration subtests; the second was defined by low scores on subtests of verbal-associative intelligence; the third was defined by low scores on visual-spatial and motoric subtests. Limitations of the study, in the scope of the psychometric testing and the lack of pediatric and neurologic diagnoses, are discussed.     

Teacher perceptions of differences among elementary students with and without learning disabilities in referred samples

Current referral and identification procedures for students with learning disabilities (LD) have been criticized on conceptual and procedural dimensions, including difficulties in operationalizing the definition and in making eligibility decisions that are data based. Recognizing these difficulties, the Texas Education Agency appointed a task force to examine various issues associated with the identification, assessment, and programming of students with LD. Task force members recognized the need to identify classroom behaviors that differentiate students with LD from their non-disabled peers. Two scales of 83 items each were devised and piloted in 70 school districts. Five significant factors or subscales were identified through discriminant factor analyses. Two subscales and 18 individual items discriminate students later classified as LD and those referred but not subsequently classified as LD. Results are discussed, with implications for further investigation of behaviors that distinguish students with and without LD.     

Locus of control and self-concept in achieving and underachieving bright elementary students

This study examined a group of academically bright fourth-grade children for positive relationships of academic achievement with locus of control and self-concept. Twenty achievers and nine underachievers received the Interllectual Achievement Responsibility Questionnaire (IAR) and the Piers-Harris Children's Self-Concept Scale. Two-factor ANOVAs were used to examine the self-concept and locus of control scores, with sex and achievement serving as the two independent factors. The results showed that achievers had significantly higher self-concepts than underachievers on the intellectual and school status subscale. In addition, achievers had significantly higher internal locus of control scores than underachievers for the IAR total score and the IAR positive score. No sex differences were revealed for either self-concept or locus of control. Implications of these results are discussed briefly.     

Comparing preservice,elementary, and junior high teachers' perceptions of school psychologists: Two decades later

One hundred eighty-one experienced teachers (elementary and junior high), and 189 preservice teachers were surveyed regarding their perceptions of school psychologists. The survey instrument used essentially the same categories as Styles in 1965, including: (a) level of training, (b) effectiveness, (c) qualifications for tasks, and (d) usefulness in specific duties. Analysis of the survey data showed there were significant differences between preservice and experienced teachers' effectiveness ratings of school psychologists on eight tasks typically performed by school psychologists. Significant differences also were found between preservice and experienced teachers on their ratings of school psychologists' qualifications to undertake specific tasks, although almost half of the experienced teachers were unable to rate the effectiveness of school psychologists. There was a small, but significant, negative relationship between the amount of contact with the school psychologist and the perceived effectiveness. Limitations inherent in survey methodology and the need to foster greater teacher awareness of the school psychologist's role are discussed.     

Comparing the self-concept of students with and without learning disabilities

This study compared self-concept in 50 middle school children with learning disabilities (LD) and 70 of their peers without LD. The students, primarily Hispanic, completed the Piers-Harris Children's Self-Concept Scale, and each obtained a score in six subdomains. Differences were found between the groups on the Intellectual and School Status and Behavior subscales, with students without LD scoring higher on both scales. There was no difference between groups on global self-concept. The limitations of this study are identified, and directions for future research are provided.     

Psychometric properties of a pictorial self-concept scale among young learning disabled pupils

The aim of this study is to assess the psychometric properties of the Pictorial Scale of Perceived Competence and Social Acceptance for Young Children (PSPCSA) (Harter & Pike, 1983) among young learning disabled pupils. The sample consisted of 105 French Canadian learning disabled pupils in Grades 1–3. All subjects completed a French translation of the PSPCSA, while 58 were retested 2–4 weeks later. The reliability analysis indicates results similar to those found in Harter and Pike's (1983) study. However, the factor analysis reveals three separate factors. These results are discussed in terms of domains of self-concept that were assessed, procedures and subjects characteristics. The main conclusion reached is that the PSPCSA should be used with caution in assessing French speaking pupils with learning disabilities. More research is needed until the instrument as reached acceptable levels of technical adequacy. 1996 John Wiley & Sons, Inc.     

Comparison of the PPVT-R and WISC-R with urban educable mentally retarded students

Comparisons of the revised PPVT (PPVT-R) and the WISC-R were made with 67 EMR students. Significant differences were found between the PPVT-R mean standard scores and Verbal, Performance, and Full Scale IQs. The PPVT-R did not correlate significantly with the WISC-R scales or subtests, suggesting the tests are measuring different abilities.     

Direct and indirect measures of writing for nonlearning disabled and learning disabled college students

Direct and indirect measures were used to compare the written language abilities of three groups of college students: two with learning disabilities and one without learning disabilities. Main effects were found for group, but not gender. Differences between nonlearning disabled students (NLD) and those with learning disabilities (LD) in writing were evident on both types of measures. Performance by LD students with disabilities in an area other than writing differed depending on the type of measure and often was no different from either of the other two groups. The combined use of direct and indirect measures appeared most effective for examining the complexities of writing produced by all groups.     

A survey of school psychologists' practices for identifying mentally retarded students

Surveys containing questions about identifying mentally retarded students were mailed to 500 randomly selected school psychologists, of whom 160 (32%) returned completed, usable forms. The Wechsler scales were the most frequently used tests for deriving IQ scores, which together with adaptive behavior scale scores were rated as most influential in identification-placement decisions. The Vineland Adaptive Behavior Scales were rated as the most used instruments for assessing adaptive delays. School psychologists were in less accord on issues such as the use of alternative norms for minority and lower SES students (35% confirmed their use), the application of an adaptive behavior standard score of 70 (47.7% indicated such use), and whether an established IQ score, such as 70, could be treated flexibly (27.2% stated they sometimes identified students with scores above the cut-off value). Suggestions are made for future research and current practice.     

Diagnostic differences between educationally handicapped and learning disabled students

WISC-R and WRAT scores for 39 Educationally Handicapped and 81 Learning Disabled students were compared to determine if the two groups differed significantly in their profiles on these instruments. Though some unexpected sex differences were discovered, the two diagnostic categories were not found to be psychometrically distinct. Further, the results of a longitudinal analysis suggested that, while IQ scores remained relatively stable over time within a subset of the original sample, achievement scores definitely declined. Possible explanations for these findings are discussed.     

A comparison between the WISC and WISC-R among educable mentally retarded students

The study compared differences and similarities between WISC and WISC-R scores for 48 ten- and thirteen-year-old EMR students, who were matched according to sex and race. The WISC-R yielded significantly lower VS, PS, and FS IQ scores than the WISC for this predominantly rural Georgia population. The FS IQ scores from the WISC-R averaged 7.5 points lower than the WISC FS IQs, with similar differences noted for VS and PS scores. There was no significant difference in FS IQs between the two age groups. Results suggest that many children classified as “Borderline” or slightly above by the WISC will be classified as “Mentally Deficient” by the WISC-R.