Verbal-Performance IQ Discrepancies Research Articles

Relations between intelligence index score discrepancies and psychopathology symptoms in the EDEN mother-child birth cohort

The aim of this study was to provide a comprehensive understanding of the potential linkages between intelligence and psychopathology across the full IQ range, while considering both absolute IQ scores and discrepancies between them. We drew data from the EDEN mother-child birth cohort, gathered at two time points: 5.5 and 11.5 years of age. We examined three instruments assessing psychopathology: the Strength and Difficulties Questionnaire, the Child Behavior Checklist, and the Mental Health and Social Inadaptation Assessment for Adolescents. We focused on four distinct scales: internalizing disorder, conduct disorder, social problems, and ADHD symptoms.Our analyses first examined correlations between Full-scale IQ, Verbal IQ, Performance IQ, and psychopathology scores. Subsequently, we explored correlations between absolute and relative verbal-performance IQ discrepancies and psychopathology scores. In general, we found that relations between intelligence index scores and psychopathology scales were generally null or negative (high IQ associated with fewer psychopathology symptoms). Our results do not lend support to the hypothesis that high intelligence or index score discrepancies are risk factors for psychopathology in children and adolescents.

Prevalence and significance of verbal-performance IQ discrepancies in pediatric OCD

Prevalence and significance of verbal-performance IQ discrepancies in pediatric OCD

Preoperative IQ predicts seizure outcomes after anterior temporal lobectomy

Purpose IQ tests are frequently used in the preoperative neuropsychological assessment of candidates for anterior temporal lobectomy (ATL). We reviewed IQ test results and surgery outcomes to evaluate the roles of IQ tests in the preoperative work-up. Methods A total of 205 adult patients who had undergone ATL and whose seizure outcomes were followed for 2 years after surgery were included. The short form WAIS-R was used to estimate intelligence. Multiple linear regression and logistic regression analyses were used to examine the variables for IQ and seizure outcomes. Results Education, duration of epilepsy and gender were factors that accounted for 24.6% of the variance in the full-scale IQ (FSIQ) scores. The verbal IQ and performance IQ discrepancies at various magnitudes could not lateralize the seizure foci. Freedom of seizure was noted in 128 (62.4%) of the patients. Seizure outcomes, however, correlated with the preoperative FSIQ. After adjustment for variables that affect seizure outcomes, the FSIQ was an independent predictor of postoperative seizure outcomes (OR 1.04, 95% CI 1.01–1.06, p = 0.003). Of patients who had FSIQ lower than 70, 50% became free from seizures by 2 years after surgery. Conclusions In our study, IQ tests were unable to lateralize seizure foci but may serve as an independent predictor of postoperative seizure outcomes. Since a longer duration of epilepsy had deleterious effects on intelligence, earlier surgical intervention might better preserve neuropsychological function and, consequently, allow better seizure control after ATL. Nonetheless, patients with lower IQ scores could still benefit from ATL.

Do Verbal-Performance IQ Discrepancies at 5 Years Persist and Predict School Performance at 8 Years in High Risk Children?

s: Abstracts of Papers Accepted for Presentation at the Annual Meeting of the Society for Developmental and Behavioral Pediatrics: Plenary Session III, Monday, September 18, 2006, 8: 30 a.m. - 9: 15 a.m.: Abstract # 60

The external validity of Asperger disorder: Lack of evidence from the domain of neuropsychology.

The present study compared individuals with high-functioning autism (HFA) and Asperger disorder (AD) in intellectual, motor, visuospatial, and executive function domains. Participants with AD demonstrated significantly higher Verbal and Full Scale IQ scores, significantly larger Verbal-Performance IQ discrepancies, and significantly better visual-perceptual skills than those with HFA. Once the superior intellectual abilities of the AD group were controlled (both statistically through analysis of covariance and by examining IQ-matched subgroups of HFA and AD participants), no significant group differences in motor, visuospatial, or executive functions were evident, save a marginally significant trend toward poorer fine motor performance in the AD group. This suggests that AD may simply be "high-IQ autism" and that separate names for the disorders may not be warranted. The relation of these findings to theories of autism and AD are discussed.

Development and Preliminary Validation of a Satz-Mogel Short form of the Wais-III in a Sample of Persons with Substance Abuse Disorders

We developed a Satz-Mogel short form of the WAIS-III and evaluated its accuracy for predicting IQs of 50 men with substance abuse disorders. Means for age, education, and Full Scale IQ were 44.20years (SD = 7.23), 12.82 years (SD = 1.53), and 98.06 (SD = 11.93). Correlations between the forms were significant for the 11 subtests (all rs ≥. 79) and three IQs (all rs ≥. 93). Short form estimated Verbal. Performance, and Full scale IQs were within →6 points of the WAIS-III 92% 80% and 90% of the time. The abbreviation may be used to estimate general intelligence, but interpretation of short-form-based IQ discrepancies should be avoided. The short form detected reliable WAIS-III Verbal-Performance IQ discrepancies only 67% of the time.

Cognitive imbalance and antisocial personality characteristics.

A cognitive imbalance, in which intellectual functioning is elevated in the performance area in comparison to verbal IQ, has been posited as an antecedent condition in relation to antisocial behaviors. The current investigation was based on the notion of a developmental arrest in which verbal, analytical, controlling brain processes (analogous to verbal IQ) fail to develop commensurately with the more impulsive actions mediated by the motor areas of the cerebral cortex (analogous to performance IQ). The simple verbal IQ performance IQ discrepancy index used in prior studies was reformulated as a causal theoretical model consisting of shared and unique performance IQ variance. The participants were 325 adults including 141 prison inmates. They were administered the Wechsler Adult Intelligence Scale-Revised (WAIS-R) and the Psychopathic Deviate (Pd) and Mania (Ma) scales of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2). These were the manifest (measured) variables in the model tested by means of structural equation modeling procedures. Several statistical indices suggested an excellent model-data congruence.

Cognitive imbalance and antisocial personality characteristics

A cognitive imbalance, in which intellectual functioning is elevated in the performance area in comparison to verbal IQ, has been posited as an antecedent condition in relation to antisocial behaviors. The current investigation was based on the notion of a developmental arrest in which verbal, analytical, controlling brain processes (analogous to verbal IQ) fail to develop commensurately with the more impulsive actions mediated by the motor areas of the cerebral cortex (analogous to performance IQ). The simple verbal IQ performance IQ discrepancy index used in prior studies was reformulated as a causal theoretical model consisting of shared and unique performance IQ variance. The participants were 325 adults including 141 prison inmates. They were administered the Wechsler Adult Intelligence Scale-Revised (WAIS-R) and the Psychopathic Deviate (Pd) and Mania (Ma) scales of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2). These were the manifest (measured) variables in the model tested by means of structural equation modeling procedures. Several statistical indices suggested an excellent model-data congruence. © 1997 John Wiley & Sons, Inc. J Clin Psychol 53: 351–354, 1997.

Clinical utility of a seven subtest WAIS-R short form in the neuropsychological assessment of traumatic brain injury

Comparison of IQ scores from the standard Wechsler Adult Intelligence Scale-Revised (WAIS-R) and the Ward (1990) seven-subtest short form (WAIS-R/7 SF) was performed on a sample of 459 patients with traumatic brain injury due to head trauma. The results indicate that this short form provides Verbal, Performance, and Full Scale IQ scores that vary little from the complete WAIS-R, at approximately one-half the typical administration time. The seven subtest short form predicted WAIS-R Full Scale IQ within 6 points in 95% of this clinical sample, with Verbal-Performance IQ discrepancies that were highly correlated (r(s) =.85, p <.0001). No differential gender effect in proration of IQs was found. Applications and pitfalls of abbreviated neuropsychological testing batteries are discussed, with utilization of the WAIS-R/7 SF offered as a means to reduce intelligence testing time while maintaining the ability to detect subtle information processing abnormalities with appropriate supplemental tasks.

Clinical utility of a seven subtest WAIS-R short form in the neuropsychological assessment of traumatic brain injury

Comparison of IQ scores from the standard Wechsler Adult Intelligence Scale-Revised (WAIS-R) and the Ward (1990) seven-subtest short form (WAIS-R/7 SF) was performed on a sample of 459 patients with traumatic brain injury due to head trauma. The results indicate that this short form provides Verbal, Performance, and Full Scale IQ scores that vary little from the complete WAIS-R, at approximately one-half the typical administration time. The seven subtest short form predicted WAIS-R Full Scale IQ within 6 points in 95% of this clinical sample, with Verbal-Performance IQ discrepancies that were highly correlated (r s = .85, p < .0001). No differential gender effect in proration of IQs was found. Applications and pitfalls of abbreviated neuropsychological testing batteries are discussed, with utilization of the WAIS-R/7 SF offered as a means to reduce intelligence testing time while maintaining the ability to detect subtle information processing abnormalities with appropriate supplemental tasks.

Comparison of IQs and Verbal-Performance IQ Discrepancies Estimated from Two Seven-Subtest Short Forms of the WAIS-R

The present study compared IQs and Verbal-Performance IQ discrepancies estimated from two seven-subtest short forms of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) in a sample of 100 subjects referred for neuropsychological assessment. The short forms of Warrington, James, and Maciejewski (1986) and Ward (1990) yielded similar correlation coefficients and absolute error rates with respect to WAIS-R IQs, although the Warrington short form requires more time to administer and score. Both short forms were able to detect significant Verbal-Performance IQ discrepancies 70% of the time. However, they incorrectly yielded significant discrepancies for approximately 25% of the sample who did not have significant differences on the full WAIS-R. The results do not support reporting and interpreting significant Verbal-Performance IQ discrepancies estimated from these short forms.

WAIS-R verbal-performance IQ discrepancies in persons with lateralized lesions: Utility of a seven subtest short form

WAIS-R Verbal-Performance IQ difference scores for Ward's (1990) seven subtest short form and the complete WAIS-R were examined in patients with lateralized and diffuse lesions. For both versions, the expected Performance > Verbal pattern was observed in the right hemisphere lesion group, while no summary score differences were seen in the left hemisphere group. Verbal-Performance IQ discrepancies for the short form fell within +/- 5 points of the WAIS-R discrepancy scores in about 75%of the cases, regardless of lesion location. Statistically reliable IQ differences between the complete and abbreviated WAIS-R attained 66%, 91%, and 89% agreement for the left, right, and diffuse groups, respectively. The results support the clinical utility of the seven subtest short form.

WAIS-R verbal-performance IQ discrepancies in persons with lateralized lesions: Utility of a seven subtest short form

WAIS-R Verbal-Performance IQ difference scores for Ward's (1990) seven subtest short form and the complete WAIS-R were examined in patients with lateralized and diffuse lesions. For both versions, the expected Performance > Verbal pattern was observed in the right hemisphere lesion group, while no summary score differences were seen in the left hemisphere group. Verbal-Performance IQ discrepancies for the short form fell within ± 5 points of the WAIS-R discrepancy scores in about 75%of the cases, regardless of lesion location. Statistically reliable IQ differences between the complete and abbreviated WAIS-R attained 66%, 91%, and 89% agreement for the left, right, and diffuse groups, respectively. The results support the clinical utility of the seven subtest short form.

Verbal-Performance IQ Discrepancies on the Mainland Chinese Version of the Wechsler Adult Intelligence Scale (WAIS-RC)

Verbal IQ (VIQ) minus Performance IQ (PIQ) discrepancies were examined for the mainland Chinese version of the Wechsler Adult Intelligence Scale (WAIS-RC), using the urban standardization sample as the data source. At the .05 level of significance, a 14-point discrepancy was required; 18 points were needed at the .01 level. The occurrence of reliable discrepancies, regardless of direction, was not related meaningfully to gender or age, although significant relationships were obtained with years of education and intelligence level. When the Chinese sample was compared with American subjects from the Wechsler Adult Intelligence Scale-Revised (WAIS-R) normative group, cross-cultural similarities and differences in VIQ-PIQ relationships were demonstrated. Interpretative strategies developed on the WAIS-R may not generalize to the WAIS-RC.

Wechsler Adult Intelligence Scale‐Revised in the Evaluation of Anterior Temporal Lobectomy Candidates

We wished to (a) determine the ability of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) to discriminate between patients with epilepsy of left or right temporal lobe (LTLE, RTLE) origin and (b) examine the ability of Kaufman's (1990) WAIS-R short forms to estimate actual Full-Scale IQ (FSIQ). We administered the WAIS-R to 215 nonretarded, left hemisphere dominant patients with invasively verified epilepsy of unilateral TL origin without lesions demonstrated by magnetic resonance imaging (MRI) (excluding mesial temporal sclerosis, MTS). LTLE (n = 106) and RTLE (n = 109) groups were compared on the WAIS-R subtests and summary IQ scores. Verbal-Performance IQ (VIQ-PIQ) discrepancies of various magnitudes, and Verbal Comprehension (VC) and Perceptual Organization (PO) scores derived by factor analysis. The LTLE group scored significantly lower on the Vocabulary subtest, and none of the other indexes reliably distinguished LTLE from RTLE patients. The Kaufman 2, 3, and 4 subtest short forms were significant predictors of FSIQ, with the 4 subtest short form having the highest correlation and lowest error of estimate.

Neurodiagnostic implications of abnormal verbal-performance IQ discrepancies on the WAIS-R: A comparison with the standardization sample

The neurodiagnostic value of Wechsler Adult Intelligence Scale-Revised (WAIS-R) Verbal-Performance IQ (VIQ-PIQ) discrepancies was evaluated in a brain-damaged sample. The VIQ-PIQ differences of 260 neurologically impaired patients was compared to the WAIS-R standardization sample. The average VIQ-PIQ discrepancy of the patients was significantly larger than the mean IQ difference for normals. Comparison of the number of subjects whose VIQ-PIQ discrepancy equaled or exceeded 95% of the controls revealed no differences for the total sample and for individuals with low average or average intelligence. Conversely, the frequency of abnormal VIQ-PIQ differences was significantly greater among patients with Full Scale IQs <or= 79. The occurrence of an abnormal VIQ-PIQ discrepancy in persons with IQs <or= 79 should serve as a stimulus for further assessment.

Neurodiagnostic implications of abnormal verbal-performance IQ discrepancies on the WAIS-R: A comparison with the standardization sample

The neurodiagnostic value of Wechsler Adult Intelligence Scale-Revised (WAIS-R) Verbal-Performance IQ (VIQ-PIQ) discrepancies was evaluated in a brain-damaged sample. The VIQ-PIQ differences of 260 neurologically impaired patients was compared to the WAIS-R standardization sample. The average VIQ-PIQ discrepancy of the patients was significantly larger than the mean IQ difference for normals. Comparison of the number of subjects whose VIQ-PIQ discrepancy equaled or exceeded 95% of the controls revealed no differences for the total sample and for individuals with low average or average intelligence. Conversely, the frequency of abnormal VIQ-PIQ differences was significantly greater among patients with Full Scale IQs ≤ 79. The occurrence of an abnormal VIQ-PIQ discrepancy in persons with IQs ≤ 79 should serve as a stimulus for further assessment.

Empirically observed and statistically derived Verbal-Performance IQ discrepancies for the old age WAIS-R standardization sample.

A formula for the estimation of abnormal VIQ-PIQ discrepancies was evaluated against the actual distribution of Verbal-Performance difference scores in the WAIS-R old age standardization sample. Results showed that the formula is sufficiently accurate for persons 75 years and older.

Effects of major depression on estimates of intelligence.

This study examined whether patients with major depressive disorder manifest deficits in intelligence during affective episodes and following clinical improvement. WAIS-R scores were contrasted in 100 patients in an episode of major depression with 50 normal controls, matched to the patient sample in terms of demographic variables and estimates of premorbid IQ. The groups were equivalent in verbal IQ, but, in line with previous studies, the depressed patients had a pronounced deficit in performance IQ. A patient subsample was administered the WAIS-R under unlimited time conditions to determine whether the time constraints of performance IQ subtests contributed to the magnitude of the verbal-performance IQ discrepancy. This discrepancy was only slightly reduced with untimed scoring. Subgroups of depressed patients were retested with the WAIS-R within one week (n = 26) or two months (n = 33) following treatment with electroconvulsive therapy. In both subsamples, IQ scores were improved at posttreatment testing relative to pretreatment, but with little change in the verbal-performance IQ discrepancy. These and related findings suggested that a performance IQ deficit is characteristic of depressed patients regardless of affective state.

Subtest profiles of the WISC-R and WAIS in mentally retarded patients with epilepsy.

In this study, WISC-R and WAIS subtest profiles of mentally retarded patients with epilepsy are analysed with respect to the Verbal-Performance IQ Discrepancy scores and rank order of mean subtest scores. The relative strengths and weaknesses in cognitive patterns of this sample are compared with subtest profiles mentioned in the literature on mentally retarded populations and samples of normal intelligent patients with epilepsy in order to determine the impact of epilepsy factors on cognition. The results indicate that people with mental retardation have problems with the verbal subtests Arithmetic, Vocabulary and Information, while patients with epilepsy have problems with Coding (Digit Symbol), Digit Span and Information. For this sample of mentally retarded patients with epilepsy, the most difficult subtests are Digit Span and Coding. The results concerning subtest profiles in different populations are discussed in light of the deleterious impact of epilepsy on cognition, which may superimpose the general effect of brain damage in mentally retarded patients. It is suggested that especially attentional processes, as measured with the subtest Coding, are vulnerable for epilepsy factors.