The factor structure and criterion validity of a test for assessment of cognitive abilities. Comparing students in special and regular education

As a consequence of a recent reform of junior secondary education in the Netherlands, instruments for the assessment of cognitive abilities of students who are eligible for special educational support must be designed. In constructing a new test battery contemporary theory on crystallized and fluid intelligence (Gf-Gc theory) was considered. Complete coverage of the factors in Gf-Gc theory was not striven for, because the status of some of these factors in relation to referral to education with special educational support is not entirely clear. The sample in the study consisted of students from regular and special primary as well as secondary education, aged between 11 and 15 years. Approximately two-thirds of the sample was of Dutch origin, whereas the remaining third was of a different ethnic origin. Results show that the factors verbal-crystallized ability, fluid-reasoning ability, spatial-visualization ability and memory capacity can explain the positive correlations between the tests in the battery for the greater part. Students from regular and special education can be distinguished on the basis of their cognitive profiles reasonably accurate, thus supporting the criterion validity of the test battery. Students requiring special educational support are characterized by a significant discrepancy between short-term recall and long-term retention and retrieval.     

Toward a research-based assessment of dyslexia: using cognitive measures to identify reading disabilities

One hundred five participants from a random sample of elementary and middle school children completed measures of reading achievement and cognitive abilities presumed, based on a synthesis of current dyslexia research, to underlie reading. Factor analyses of these cognitive variables (including auditory processing, phonological awareness, short-term auditory memory, visual memory, rapid automatized naming, and visual processing speed) produced three empirically and theoretically derived factors (auditory processing, visual processing/speed, and memory), each of which contributed to the prediction of reading and spelling skills. Factor scores from the three factors combined predicted 85% of the variance associated with letter/sight word naming, 70% of the variance associated with reading comprehension, 73% for spelling, and 61% for phonetic decoding. The auditory processing factor was the strongest predictor, accounting for 27% to 43% of the variance across the different achievement areas. The results provide practitioner and researcher with theoretical and empirical support for the inclusion of measures of the three factors, in addition to specific measures of reading achievement, in a standardized assessment of dyslexia. Guidelines for a thorough, research-based assessment are provided.     

Memory modality differences in children with Attention Deficit Hyperactive Disorder with and without learning disabilities

This study assesses information processing and memory functioning in 50 children diagnosed with Attention Deficit Hyperactive Disorder (ADHD) with and without learning disabilities (LD). Mode of presentation (visual vs. auditory), type of memory processing (immediate, short-term, and long-term), and order of recall (ordered vs. unordered) were assessed using the Learning Efficiency Test-II (LET-II). Both groups demonstrated difficulty with auditory ordered recall and lost substantial information from immediate memory to short-term and long-term memory stores. The ADHD/LD group also demonstrated more difficulty with ordered recall than the ADHD only group. While there were no differences between the two groups in regard to immediate recall, the ADHD/LD group demonstrated more problems transferring information into short-term and long-term memory stores than the ADHD only group. Verbal interference effects significantly decreased retention for both visual and auditory processing. Results indicate that ADHD alone presents significant problems in information processing, but the comorbid effects of a learning disability further intensify the negative impact of ADHD. © 1996 John Wiley & Sons, Inc.     

An analysis of WISC-R factors for gifted students with learning disabilities

Intellectual patterns of gifted students with learning disabilities were studied to determine cognitive factors characterizing these children. Twenty-four gifted children with learning disabilities (LD) and a control group of nondisabled gifted children were administered the Wechsler Intelligence Scale for Children-Revised (WISC-R) (Wechsler, 1974). While differences between the two groups on individual subtests were examined, a comparison of broader factors was emphasized in discovering cognitive patterns that might suggest effective intervention. Experimental and control performances were compared on 14 factor scores, using cognitive classification systems of Bannatyne (1971), Kaufman (1975), Rapaport, Gill, and Schafer (1946), and Wechsler (1974). Gifted students with LD were more reliant on verbal conceptualization and reasoning than the control students. They also demonstrated deficiencies in short-term auditory memory and sound discrimination. The gifted group with LD exhibited the Organic Brain Syndrome factor (Wechsler, 1974) to a significantly greater extent than did the control group.     

Auditory perceptual processing in reading disabled children

One hundred and three children attending Learning Assistance Centres due to reading difficulties and one hundred and three matched, average readers were administered a battery of auditory perceptual processing tasks. The battery was composed of auditory analysis and synthesis, auditory sequential memory, auditory discrimination, and phonemic segmentation tasks. A principal components analysis yielded four factors. These were determined to be advanced phonological awareness, sequential memory, discrimination, and simple phonological awareness. Discriminant analyses, using the factor scores, indicated that three of the four factors were able to discriminate between the able and disabled readers. Most notable among these was advanced phonological awareness. Auditory discrimination could not discriminate between the groups. The results suggest that there may not be one underlying phonological ability implicated in successful reading acquisition. Furthermore, it is clear that two levels of phonological awareness exist and that screening and diagnostic instruments should address both in order to have predictive validity.     

Enabling skills in early reading acquisition: A study of children in Latvian kindergartens

Preschool children in Latvia were tested in order to examine the relationships among various enabling skills and early reading performance. A principal component analysis indicated three factors: a phonemic awareness factor, a naming factor, and a short-term memory factor. Multiple regression analyses with word identification and sentence comprehension as dependent variables yielded further support to the powerful role played by phonemic awareness in explaining variance in both these aspects of reading. Unexpectedly, neither naming nor short-term memory contributed to explain unique variance in word and sentence reading. The Latvian orthography is very consistent, and our results provide further evidence to the importance of phonemic awareness in early reading acquisition especially in a transparent language. Therefore, the tasks used when assessing phonemic awareness can be very useful when screening children at risk for developing reading problems. Enhancing children's letter knowledge and phonemic awareness skills should be a priority goal in the kindergarten classroom.     

The performance of preschoolers with speech/language disorders on the McCarthy Scales of Children's Abilities

The McCarthy Scales of Children's Abilities (MSCA) was used to evaluate the performance of preschool children with speech/language disorders. Preschoolers were screened first for normal intelligence using the Performance scale of the Wechsler Preschool and Primary Scale of Intelligence (WPPSI). Preschoolers with speechllanguage disorders had significantly lower scores on all scales of the MSCA (Verbal, Perceptual/Performance, Quantitative, and Memory), except the Motor scale. They also had an average 20-point lower GCI than the control children. An analysis of the scores of the speechllanguage group on subtests revealed difficulty in short- term auditory memory skills but not in short-term visual memory skills. Deficits in categorical thinking skills and verbal expression skills were also evident. Characteriza- tion of learning disabilities in preschoolers with speechllanguage disorders is discussed.     

A comparison of visual and auditory processing tests on the Woodcock-Johnson Tests of Cognitive Ability,Revised and the Learning Efficiency Test-II

A comparison of the visual and auditory processing factors of the WJR Tests of Cognitive Ability and the visual and auditory memory factors of the Learning Efficiency Test, II were examined for 120 undergraduate college students. Repeated measures ANOVAs revealed two significant performance differences: between the WJR COG and LET-II visual processing factors and between the WJR Broad Cognitive Ability index and the LET Global Memory score. Although there was no significant performance difference on the WJR COG and LET-II auditory processing factors, the two measures were independent, accounting for less than 4% shared variance. Similarly, WJR COG and LET-II visual processing factors also were independent. It was hypothesized that differing levels of task complexity, such as order vs. unordered memory retrieval requirements, semantic meaningfulness of the material presented, and rehearsal and/or presence of verbal interference components, represent distinct performance outcome measures of visual and auditory processing by the WJR COG and LET-II. © 1997 John Wiley & Sons, Inc.     

Reading comprehension and lateral preference in normal readers

The effect of lateral preference on passage comprehension and short-term memory function was examined for 48 normal fourth-grade males. Scores on a self-report measure of lateral preference were used to divide the children into groups who differed in their laterality. The subjects were tested for basic comprehension on written and aurally presented prose in standard and nonstandard phrase form. Consistently lateralized readers recalled more information under the auditory than under the written conditions, while bilateral readers showed no preference for mode of presentation. Between-group comparisons showed bilateral readers to comprehend significantly more in the written conditions than did the other group. Groups did not differ on recall of auditorily presented material or on short-term digit memory. These results may be interpreted as demonstrating that bilateral preference need not be tied to reading difficulty.     

Stimulus modality and short-term memory in rats

Two experimental paradigms are presented aimed at determining the retention of auditory and visual information over brief delay intervals. First, a conditional delayed matching-to-sample procedure was used in which rats were required to symbolically match the modality of the sample stimulus with one of two comparison stimuli. In the second experiment, subjects were trained and tested using a Konorski-type procedure. Despite the conceptual and procedural differences between the two procedures, subjects in both experiments showed steeper forgetting functions for visual events than for auditory events, while performance levels at 0-sec delay intervals were equivalent for both stimuli. These results, when taken together with related research conducted with pigeons, suggest that content of memory may have important influences on the short-term retention abilities of animal subjects.     

Perceptual skills and Arabic literacy patterns for mathematically gifted children with specific learning difficulties

Phonological awareness is a key factor in the development of literacy, and frequently presents itself as an area of weakness in pupils with reading difficulties. In this article, Anies Al-Hroub of the American University of Beirut sets out to define a distinguishing pattern of characteristics that supports the identification of pupils with specific learning difficulties who are gifted in mathematics and reports the assessment of the pupils' visual and auditory perceptual skills, including phonological awareness. The assessments were designed to measure auditory and visual memory skills, auditory and visual analysis skills, speed of information processing and spoken language (receptive and expressive). Furthermore, aspects of language learning such as reading, writing, spelling and parts of listening ability were all assessed for mathematically gifted pupils with specific learning difficulties who scored above the cut-off score of 120 on the WISC-III-Jordan. The article closes with recommendations for further research.     

An instrument in search of a theory: Structural validity of the Kaufman assessment battery for children-second edition normative update at school-age

The present study examined the factor structure of the Kaufman assessment battery for children-second edition normative update with normative sample participants aged 7–18 years (N = 500) using confirmatory factor analysis with maximum likelihood estimation and multidimensional scaling procedures. For the 10 subtest Cattell-Horn-Carroll core battery configuration, an alternative hierarchical model with four group-specific factors (crystallized ability, perceptual reasoning, short-term memory, and long-term storage and retrieval) provided the best fit to the normative data for both age groups. These results suggest caution for interpreting the visual processing and fluid reasoning index scores in isolation given the inability to locate those constructs independently at school-age. Implications for the clinical interpretation of the measurement instrument moving forward are discussed.     

Auditory and visual factors related to spelling success

Compared good and poor spellers at the third- and sixth-grade levels on seven tasks that measured visual and auditory discrimination, memory, analysis and synthesis skills. The results indicated that five tasks discriminated between good and poor spellers at the third-grade level: tasks requiring visual discrimination and visual memory of words; auditory discrimination, memory, analysis and synthesis; and auditory-visual integration. Two tasks discriminated between good and poor spellers at the sixth-grade level: tasks requiring auditory discrimination, memory, analysis and synthesis; and auditory-visual integration. Memory for words and sentences did not discriminate between good and poor spellers at either grade level.     

Cognitive and Linguistic Precursors to Early Literacy Achievement in Children With Specific Language Impairment

This study investigated the role of cognitive and language skills as predictors of early literacy skills in children with Specific Language Impairment. A range of cognitive and linguistic skills were assessed in a sample of 137 eight-year-old children with SLI at the beginning of the school year, and 6 months later on word decoding and reading comprehension. The cognitive and linguistic measures revealed four factors that were called language, speech, short-term memory, and phonological awareness. Structural equation modeling showed word decoding to be predicted by speech, short-term memory, and phonological awareness, whereas reading comprehension was predicted by word decoding skills and short-term memory. It can be concluded that in children with SLI variations in early word decoding are mostly determined by speech abilities and short-term memory, and to a lesser extent by phonological awareness. Moreover, reading comprehension turns out to be highly dependent on word decoding and short-term memory.     

Short-term Memory in While-Listening Comprehension

Short-term memory plays an essential role in successful listening comprehension.The information extracted from short-term memory in listening comprehension is influenced by many factors.This paper explain some ways of improving listening ability while examine,which emphatically point out how to extend short-term memory.     

Which cognitive abilities at age four are the best predictors of reading ability at age seven?

A longitudinal study investigated the relationship between cognitive abilities at age four and reading at age seven. Reading ability was significantly positively correlated with knowledge of grapheme-phoneme correspondence, visual memory, auditory sequential memory, and Draw-a-man scores (intelligence). Once age (20ro) and intelligence (12%) were partialled out, auditory sequential memory scores at age four accounted for 13% of the variance in reading scores with visual sequential memory scores predicting a further 5%. Implications of results are discussed.     

Effects of auditory perception training on reading achievement

This study investigated the effect of an auditory training programme with backward readers who were also deficient in one or more auditory perceptual subskills. Thirty subjects were randomly assigned to one of three groups. The experimental group received a nine hour taped programme devised by the experimenter and designed to teach the skills of auditory discrimination, memory, analysis and synthesis and auditory-visual integration. The comparison group listened to stories on tape for the same duration as the experimental group, while the third group served as a control merely being tested at the beginning and at the end of the experiment. It was found that although the training programme significantly improved the performance of the experimental group over the other two groups on a total auditory perceptual test, there was no corresponding improvement in reading, on word recognition or comprehension tests. The particular auditory subskills which appeared amenable to training were auditory discrimination (rhyme) and auditory synthesis (blending and closure).     

阅读困难者短时记忆缺陷原因探析

为了探讨汉语阅读困难和普通儿童短时记忆缺陷的原因,本研究从北京13个小学筛选出阅读困难儿童并配以相当数量的正常阅读儿童参加数字、汉字短时记忆及阅读测试。方差分析和分层回归分析表明阅读困难者短时记忆显著落后于普通读者,短时记忆的缺陷存在于记忆容量和提取效率上,且受阅读能力的影响。     

视听觉障碍儿童的认知能力

本篇主要探究视听觉障碍儿童的基本认知能力。视觉障碍儿童的听觉注意、听觉记忆和听觉表象比正常人更好 ;听觉障碍儿童的视觉搜索 (视觉注意 )、视觉表象、运动表象和视觉记忆比正常人好。这些实验研究更好地支持了特殊教育的三原则     

Interference and auditory short-term memory in the bottlenosed dolphin

Interference in auditory short-term memory in the bottlenosed dolphin,Tursiops truncatus (Montagu), was studied using a delayed matching-to-sample task. At each trial, one of two sample sounds, chosen randomly, was projected underwater for 4 sec and then, after a variable delay interval, both sounds were presented. A response to the sound matching the initial sample was reinforced. Correct matching was significantly reduced following short intervals between trials in combination with long delays after the sample (proactive interference), or when a near continuous irrelevant sound was inserted into the delay interval (retroactive interference). There was rapid habituation to interference if the irrelevant sound was short in duration relative to the delay interval. For both proactive and retroactive interference, the errors were predominantly responses to the sample sound appropriate to the prior trial rather than to the current trial, indicating that memory for the relative recency of events (temporal memory) was degraded by interference. When interference was deleted or minimized, temporal memory remained nearly perfect over 30-sec delay intervals, the longest tested. The importance of distinguishing between temporal memory and nontemporal, or event, memory in different forms of the delayed matching task was emphasized.