Total IQ Scores Research Articles

COGNITIVE FUNCTION AND EVENT-RELATED POTENTIALS IN PATIENTS WITH CEREBROVASCULAR DISEASES

In order to study differences between event-related potentials generated during counting and button-pressing tasks, the auditory event-related potentials from 103 patients (62 males, 41 females) aged 43-90 years with chronic cerebrovascular diseases were recorded. All patients were evaluated for severity of cognitive deterioration with Hasegawa's Dementia Score (HDS) examination, and 44 also underwent Wechsler Adult Intelligence Scale (WAIS) examination.The target stimulus was a pure tone with a frequency of 2, 000 Hz delivered binaurally at 75 dB in 20 % of trials, and the non-target stimulus was a pure tone with a frequency of 1, 000 Hz delivered at 75 dB in 80 % of trials. On the counting task, the patient was instructed to keep a mental record of the number of target tones, and on the button-pressing task, to press the button switch as quickly and precisely as possible whenever he recognized the target tone. Responses were recorded from Cz and Pz electrode placements on the scalp (International 10 : 20 system) referred to linked mastoids. Waveforms were averaged on-line by a signal processor (7 T17 or 7 T18), which also controlled the stimulus presentation and artifact rejection.The button-pressing task was easier to perform than the counting task, and the P300 waveforms were clearer in the former than in the latter. The P300 latency of the button-pressing task was shorter than that of the counting task.The P300 latency of both tasks was found to be negatively correlated with HDS, and the button-pressing task showed higher correlation than the counting task.On the button-pressing task, the P300 latency was found to be negatively correlated with Total IQ, Verbal IQ, Performance IQ and many subtest scores, while on the counting task it showed negative correlation with Performance IQ and only a few subtest scores. Most negative correlations between the P300 latency and subtest scores were greater on the button-pressing task than on the counting task, indicating that the former is a better measure of cognitive function than the latter.Of the subtests, Object Assembly, Digit Symbol, Block Design and Picture Completion scores showed highly negative correlations with the P300 latency. We therefore presume that the P300 component strongly reflects constructional ability in cognitive function.HDS and Performance IQ showed significant negative correlations with the P300 latency of both tasks. Analysis of covariance for their regression lines showed significant differences.In the counting task, the N100 latency was negatively correlated with the score of one subtest, namely, Vocabulary. However, the N200 and P200 latencies did not correlate significantly with WAIS IQs or subtest scores on either the counting task or the button-pressing task.

A survey of a Cambridge suburb: familial resemblances and IQ components.

SummaryThis study presents parent–offspring and sibling resemblances for verbal and visuospatial IQ components and total IQ scores in both non-manual and manual social groups. Offspring on mid parent regression coefficients provided upper limits to phenotypic IQ similarity. There were no significant differences in regressions between social groups.The sex linked hypothesis for spatial ability was examined but neither parent–offspring nor sibling correlations were in the order predicted by the hypothesis.

A biological survey of a Cambridge suburb: Assortative marriage for IQ and personality traits

An account is given of a study, carried out in a Cambridge suburb, which measured the similarity in IQ and some personality traits between spouses. In both sexes mean IQ scores tended to diminish from social class I to V. Lower IQ scores were associated with higher levels of extraversion, neuroticism and inconsistency. Assortative marriage was found for IQ components, Total IQ, extraversion-introversion and inconsistency scores. Both geographical and social stratification were shown to affect the degree of assortative marriage.

Social mobility and IQ components.

SummaryThis study examines the relationship between verbal, performance and total IQ scores and social class of 193 male householders living in a Cambridge suburb. The correlation coefficients between IQ scores and present occupational status were significantly higher than the correlations between IQ scores and social class of origin, suggesting that intragenerational social mobility is positively related to IQ.Parent–offspring data were available for 85 father–son pairs. Analysis of the IQ differences between fathers and sons in relation to their social class differences provided further evidence for selective migration related to both IQ components and total IQ scores. In this sample there was a simple relationship between the extent of social mobility and the degree of difference between the father's and son's IQ scores.

Intelligence and Imagery in Personality

One hundred college undergraduates were administered the Richardson revision of the Gordon Test of Visual Imagery Control, the Betts-Sheehan Questionnaire Upon Mental Imagery, and the Shipley-Hartford Institute of Living Scale. The latter provided a conceptual quotient (CQ) score of intellectual impairment based upon a ratio between vocabulary and abstraction scores. Subjects with CQs above 100 had significantly higher control scores (p less than .02). High control subjects had significantly higher total IQ scores than did low control subjects (p less than .04). Subjects with high and medium range control had higher vocabulary scores than those with low control. This suggests possible assessment of proneness toward introverted and extraverted neuroticism based upon a combination type of imagery score and the ratio between abstract or vocabulary scores. The connection of imagery with dimensions of IQ may be a start toward a more refined measure of this aspect of personality. Problems and implications are discussed.

A Validation Study of a Transferred Group Intelligence Test

Abstract The purpose of the research was to conduct a validation study of a transferred group intelligence test. The Lorge-Thorndike Intelligence Test, Level A, Form 1 was translated to Hebrew and administered to an Israeli sample comparable to the original norming group. The results obtained were concerned with variability, reliability, validity, item analysis, intercorrelations among subtests, and factor analysis. While few comparisons of the Israeli sample with the original data were made, the validation of the transferred test was examined in the light of other criteria for evaluating a new test. The suitability of the transferred test for Israeli high achievers from high-status families was supported by the results. The major conclusions were: (1) the total mean IQ scores of Israeli students were approximately the same as the American mean; (2) mean raw scores increased with age; (3) relative difficulty of individual items remained stable through translation and administration in Israeli culture, in ...

Verbal and performance IQ for discrimination among psychiatric diagnostic groups.

WAIS Verbal and Performance IQ scores were obtained from medical records of 500 psychiatric inpatients recently admitted to a large university hospital. With a subsample of the original 500 patients for whom there was diagnostic agreement between two independent clinicians, a multivariate analysis of variance was carried out to determine the extent to which the Verbal and Performance scores discriminated among eight diagnostic categories into which patients were classified. In the multivariate ANOVA, statistical techniques were employed to control for concomitant background variation that otherwise might have been confounded with true diagnostic group differences in Verbal and Performance IQ. Although mentally retarded and organic brain syndrome patients could be distinguished significantly from other diagnostic groups on the basis of their lower total IQ scores, the data did not support the persistent clinical belief that functional psychiatric disorders differed in the WAIS measurement space.

Quick word test validity with adults.

Quick Word Test (QWT) total and part scores for 178 adults were correlated with WAIS IQ scores. Pearson rs of .77 and .74 were found between total QWT scores and WAIS verbal and total IQ scores, respectively. Data indicate that the QWT appears to be a valid measure of general mental ability.