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PubMed1991

Intelligence and educational level in adult males at the extremes of stature.

Stature and intellectual ability are commonly found to correlate positively (r approximately 0.2). In this study we have assessed whether this relationship holds true at the extremes of stature in adults. From a representative study population of 76,111 young Danish men, we defined an extremely short group as those below the 2d percentile (less than or equal to 163 cm) and an extremely tall group as those above the 98th percentile (greater than or equal to 191 cm). The short group had intelligence test scores and educational levels lying at approximately two-thirds of a standard deviation below the overall means. The tall group had means lying approximately one-half standard deviation above the overall means. These deviations are to a large degree in agreement with the observed overall correlations of height with intelligence test scores (r = 0.244) and with educational level (r = 0.264). Both groups, however, appear to score somewhat below the levels expected from a purely linear relationship. For the short group there appear to be local factors that are particularly detrimental to intellectual ability. For the tall group corresponding local factors are relatively independent of intellectual ability.

Adolescent↗
PubMed2002

Cognitive, behavioral, and social outcome in survivors of childhood stem cell transplantation.

PURPOSE: To evaluate prospectively the cognitive functioning and to obtain ratings of cognitive, behavioral, and social functioning for children receiving stem cell transplantation (SCT). PATIENTS AND METHODS: Forty-seven children treated with SCT for malignant or nonmalignant disorders who had no previous cranial radiation therapy, no central nervous system tumors, and were aged birth to 16 years were administered the Bayley Scales of Infant Development or IQ test before SCT and an intelligence test 1 and 2 years after SCT. Children and parents rated behavior and social functioning, and parents reported on everyday cognitive abilities (including academic ability) 2 to 6 years after SCT. RESULTS: There were no statistically significant differences in IQ over the course of time (before SCT to 2 years after SCT). Only parent ratings of academic ability were significantly lower than the normal standardization sample. Mean mental scale scores for children younger than 3 years were lower than mean IQ scores for children older than 3 years at the pre-SCT assessment. Mean test scores not only decreased for younger children but also were 16 points lower than mean scores for older children at 2 years after SCT. CONCLUSIONS: The cognitive, behavioral, and social functioning of children 3 years and older is not detrimentally affected 2 years after SCT. Parents of older children report no cognitive ability problems but lower academic ability. Children younger than age 3 years may be at risk for decreased cognitive skills.

Adolescent↗
PubMed2004

Children with low motor ability have lower visual-motor integration ability but unaffected perceptual skills.

The purpose of this study was to examine perceptual, visual-motor abilities and intellectual skills in children with low, average and above average motor abilities. The participants were 144 children (aged 6-10 years) attending elementary school. Three groups of children were identified on the basis of their performance at the TGMD (Test of Gross Motor Development; [Ulrich, D.A. (1985). TGMD, Test of Gross Motor Development. Austin, Texas: PRO-ED. Edizione Italiana a cura di D. Ianes, TEST TGM. Test di valutazione delle abilita grosso-motorie. 1994, Trento: Edizioni Centro Studi Erickson]). Each child received an intelligence test (K-BIT; [Kaufman, A.S., & Kaufman, N.L. (1990). K-BIT. Kaufman Brief Intelligence Test. Circle Pines, MN: American Guidance Service]) and was evaluated for perceptual and visual-motor integration abilities (DTVP; [Hammill, D.D., Pearson, N.A., & Voress, J.K. (1993). Developmental Test of Visual Perception (2nd ed.). Austin, Texas: PRO-ED. Edizione Italiana a cura di D. Ianes, TEST TPV. Test di percezione visiva e integrazione visuo-motoria. Trento: Edizioni Centro Studi Erickson]). Results highlight a significant difference in visual-motor integration between children with high and low gross-motor abilities, in the absence of significant differences in perceptual skills or intellectual ability. The findings are discussed with reference to the concept of atypical brain development [Gilger, J.W., & Kaplan, B.J. (2001). Atypical brain development: A conceptual framework for understanding developmental learning disabilities. Developmental Neuropsychology, 20, 465].

Child↗
PubMed1979

The electroencephalogram (EEG) as a research tool in human behavior genetics: psychological examinations in healthy males with various inherited EEG variants. II. Results.

The results of psychological examinations on 298 adult male probands with various inherited EEG variants are described. They may be summarized as follows: 1) The low-voltage (N) group scored high in intelligence tests, especially in spatial orientation. Personality scores revealed this group as 'normal', extravert, group-dependent, and not very energetic. 2) The borderline low-voltage (NG) group showed slight weakness in abstract thinking, short-time memory, and motor skills and a relatively strong tendency to have 'neurotic' complaints. Reaction time and motor skills were poor. 3) The occipital fast alpha-variants (BO) group performed very well in tests of abstract thinking and motor skills. 4) The monotonous alpha (R) group showed average performance in most intelligence scores but above-average in short-time memory and in precision under stress conditions. Personality scores indicated high spontaneous activity and toughmindedness. 5) The BG (fronto-precentral beta-group) category showed very low MMPI scores, indicating little neurotic tendency. Intelligence could be above average. 6) The diffuse beta (BD) group scored low in intelligence tests, especially in spatial orientation, and had a high error rate in tests measuring concentration and precision. Most differences were relatively small; the whole range of test scores could be found in all EEG groups.

Adult↗
PubMed1998

Improvements in cognitive functioning following intensive behavioural rehabilitation.

Serial evaluation of intelligence tests performed with long-term patients in psychiatric hospitals frequently reveal deterioration in cognitive functioning. Despite early success in the amelioration of cognitive symptoms of schizophrenia, little effort at cognitive remediation is currently directed to long-term psychiatric patients. In contrast, in the brain injury rehabilitation community, cognitive remediation is strongly supported despite mixed results in clinical literature. Within this context, individuals with brain injury in psychiatric hospitals may have little prospect of receiving cognitive remediation services. Utilizing performance on intelligence testing spanning 20 years, the following study evaluates changes in cognitive functioning of a severely brain injured individual, who had been replaced in a long-term psychiatric hospital and treated in an intensive behavioural rehabilitation programme. Results found that the patient demonstrated a significant improvement in overall verbal and nonverbal cognitive functioning during treatment. These improvements were maintained for a 1-year period. It was suggested that the use of 'low tech', small group interventions, within intensive behavioural rehabilitation programmes, may lead to the recovery of cognitive functioning for individuals who are significantly post-injury.

Adult↗
PubMedDate not supplied

[Relationship between psychogenic symptomatology and intelligence].

Corresponding to variables "leading symptoms in the psychic area" and "psychosomatic diseases in a restricted sense" 493 patients have been divided in four groups. Taking the hypothesis that patients with a different symptomatic show different results in the HAWIE (Hamburg-Wechsler-Intelligence-Test for Adults) four groups have been compared corresponding to their HAWIE-scores. It turns out that patients with a psychic leading symptomatic without important somatic disease and patients with psychosomatic illness in a restricted sense without psychic symptoms showed better results compared with other patients in the verbal tests. For this correlations of the higher scores in the verbal part of the intelligence-test with the phenomena that the investigator more often found the diagnosis of a psychic leading symptom or a psychosomatic disease in a restricted sense the following interpretations are considered: 1. The innerpsychic effort connected with different psychogenic disorders is reflected in the cognitive efficiency. 2. The diagnosis of limited psychomatic illness is also a result of the verbal interaction of doctor(s) and patient.

Humans↗
PubMed2001

There are stable individual differences in performance variability, both from moment to moment and from day to day.

Individual differences in decision speed have been regarded as direct reflections of a "primitive" functional neurophysiological characteristic, which affects performance on all cognitive tasks and so may be regarded as the "biological basis of intelligence", or of age-related changes in mental abilities. More detailed analyses show that variability within an experimental session (WSV) is a stable individual difference characteristic and that mean choice reaction times (CRTs) are gross summary statistics that reflect variability, rather than maximum speed of performance. A total of 98 people aged from 60 to 80 years completed 36 weekly sessions on six different letter categorization tasks. After effects of practice and of circadian variability had been eliminated, individuals with lower scores on the Cattell Culture Fair intelligence test had slower CRTs and greater WSV on all tasks. A simulation study showed that the greater WSVs of low Cattell scorers led directly to the significantly greater variability of their mean CRTs from session to session. However because CRTs on tasks co-varied from session to session it was apparent that, besides being affected by WSV, individuals' between-session variabilities (BSVs) also vary because of state changes that affect their performance from day to day. It seems that both variability in performance from trial to trial during a session and variability in average performance from day to day are correlated, stable, individual difference characteristics that vary inversely with intelligence test performance. Methodological consequences of these results for interpretations of age-related cognitive changes, for variability between as well as within individuals, for individual differences in decision speed, and for circadian variability in performance are discussed.

Aged↗
PubMed1985

Sleep, dreaming, and adaptation to a stressful intellectual activity.

Sixteen male subjects slept in the laboratory for 4 consecutive nights. Night 1 was an adaptation night and night 2 was a baseline night of uninterrupted sleep. On nights 3 and 4 subjects were asked to complete "intelligence" tests prior to sleep. One half of the subjects attempted to complete difficult versions of "intelligence" tests without knowing that they could not be completed in te time allotted. The other subjects were given easier versions of the same tests that they were able to complete in the time allotted. Night 3 was a night of uninterrupted sleep and night 4 involved REM period awakenings for the purpose of dream collection. Stressful manipulation consisted of telling the subjects before the administration of either set of tests that an average university student should complete most of the items within the allotted time. On night 3 both groups showed a significant increase in sleep latency and a significant decrease in REM density compared to the baseline night. On night 4 subjects in the difficult condition experienced significantly more anxiety in their dreams and somewhat higher levels of incorporation of the presleep material than subjects in the easy condition. Our findings suggest that following a stressful experience uninterrupted sleep has more short term adaptive value than a procedure which enhances dream recall and that subjects who incorporate elements from a presleep stressful event into their remembered dreams show less adaptation on awakening than subjects who do not.

Adaptation, Psychological↗
PubMed1984

Determinants of relapse among alcoholics: a cross-cultural replication study.

This study reports on a replication of Marlatt and Gordon's (1980) findings concerning relapse determinants among alcoholics. It was undertaken in a somewhat different drinking culture (Sweden) and with a group of alcoholics also containing patients relapsing after a longer period of abstinence than those in the Marlatt and Gordon study. The difference in drinking culture is reflected in the finding that most subjects in this study took their first drink at home. The group studied by Marlatt and Gordon in Seattle most frequently started to drink in a bar or restaurant. In spite of the differences between the groups, we arrive at a similar picture when it comes to the distribution of relapse determinants according to the model proposed by Marlatt and Gordon. The categories not only have face validity but also construct validity, reflected in meaningful correlations with results on an intelligence test and a personality inventory. A descriptive analysis shows that subjects with poorer results on the intelligence test and having a high tendency to muscle tension and somatized anxiety tended to relapse in intrapersonal situations. Patients who do not readily adjust to other persons' opinions relapsed in interpersonal conflicts, and patients who are more impulsive could not resist social pressure to drink.

Adult↗
PubMed1995

Structural equation model of intellectual change and continuity and predictors of intelligence in older men.

This study examined the effects of abilities as a young adult, an engaged lifestyle, personality, age, and health on continuity and change in intellectual abilities from early to late adulthood. A battery of measures, including a verbal and nonverbal intelligence test, was given to 326 Canadian army veterans. Archival data provided World War Two enlistment scores on the same intelligence test for this sample: Results indicated relative stability of intellectual scores across 40 years, with increases in vocabulary and decreases in arithmetic, verbal analogies, and nonverbal skills. Young adult intelligence was the most important determinant of older adult performance. Predictors for verbal intelligence were consistent with an engagement model of intellectual maintenance but also indicated the importance of introversion-extraversion and age. Nonverbal intelligence in late life was predicted by young adult nonverbal scores, age, health, and introversion-extraversion.

Aged↗
PubMed2003

On the importance of early reflections for speech in rooms.

This paper presents the results of new studies based on speech intelligibility tests in simulated sound fields and analyses of impulse response measurements in rooms used for speech communication. The speech intelligibility test results confirm the importance of early reflections for achieving good conditions for speech in rooms. The addition of early reflections increased the effective signal-to-noise ratio and related speech intelligibility scores for both impaired and nonimpaired listeners. The new results also show that for common conditions where the direct sound is reduced, it is only possible to understand speech because of the presence of early reflections. Analyses of measured impulse responses in rooms intended for speech show that early reflections can increase the effective signal-to-noise ratio by up to 9 dB. A room acoustics computer model is used to demonstrate that the relative importance of early reflections can be influenced by the room acoustics design.

Adult↗
PubMed2005

Impaired memory and general intelligence related to severity and duration of patients' disease in Type A posttraumatic stress disorder.

Studies of short-term memory and general intelligence associated with duration and severity of posttraumatic stress disorder (PTSD) on observed Type A scores are rare. The authors' aim was to assess Type A behavior and identify subgroups of patients who performed most poorly on memory and intelligence tests and Type A scores related to the severity and duration of their disease. They administered nonverbal memory and intelligence tests to 30 men with PTSD and 20 men without PTSD who responded. During their initial contact with the participants, 2 experts assessed 3 major coronary-prone characteristics (hyperalertness, tight facial musculature, and explosive speech). They found significant differences between the PTSD and control groups in total Type A scores. Those with the most severe PTSD performed most poorly on visual retention tests and showed the highest scores on self-reported and subjective diastolic blood pressure reactivity during magnetic resonance imaging. In the PTSD group, high error scores on the visual retention test predicted Type A behavior and low scores on the picture memory block design tests predicted high Type A scores. A significant positive correlation was found between Type A and clinician-assessed subjective distress, whereas the correlations were significantly negative between picture memory and Type A behavior Suppressed fear is commonly associated with PTSD; decades of research on Type A behavior have isolated fear as a crucial factor in cardiovascular disease.

Adult↗
PubMed1980

Effectiveness and safety of prenatal phenobarbital for the prevention of neonatal jaundice.

The effect of 100 mg of phenobarbital (PB) at bedtime for the last few wk of pregnancy on the incidence and severity of neonatal hyperbilirubinemia was studied. No effect was observed in the newborns of mothers who took less than ten tablets. In the 1310 newborns of adequately treated mothers (PB greater than or equal to 1.0 g), the incidence of marked jaundice (bilirubin > 16.0 mg/dl) and the need to perform an exchange transfusion were reduced by a factor of six in relation to the incidence in 1553 control infants. A randomly selected group of 415 children (182 control, 233 PB) were reexamined at 61 to 82 months of age. There was no difference in the overall morbidity and mortality between the control and treatment group. A detailed neurologic assessment failed to reveal any differences between the two groups. In the VisuoMotor Integration test, the PB group scored significantly better than the control group. In the Draw-A-Woman and the Verbal Intelligence Test, the difference was in the same direction but was not statistically significant. The degree of jaundice was not found to significantly influence the performance in the neurological examination and the intelligence tests. Sensorineural hearing defect was significantly more common in the children with moderate or marked jaundice (bilirubin > 12 mg/dl) than in those with lesser degrees of jaundice. Prenatal PB is a practical, effective, and safe method for decreasing the incidence of neonatal hyperbilirubinemia.

Bilirubin↗
PubMed2004

Practice and drop-out effects during a 17-year longitudinal study of cognitive aging.

Interpretations of longitudinal studies of cognitive aging are misleading unless effects of practice and selective drop-out are considered. A random effects model taking practice and drop-out into account analyzed data from four successive presentations of each of two intelligence tests, two vocabulary tests, and two verbal memory tests during a 17-year longitudinal study of 5,899 community residents whose ages ranged from 49 to 92 years. On intelligence tests, substantial practice effects counteracted true declines observed over 3 to 5 years of aging and remained significant even with intervals of 7 years between successive assessments. Adjustment for practice and drop-out revealed accelerating declines in fluid intelligence and cumulative learning, linear declines in verbal free recall, and no substantial change in vocabulary. Socioeconomic status and basal levels of general fluid ability did not affect rates of decline. After further adjustment for demographics, variability between individuals was seen to increase as the sample aged.

Aged↗
PubMedDate not supplied

Single-word intelligibility in speakers with repaired cleft palate.

Many speakers with repaired cleft palate have reduced intelligibility, but there are limitations with current procedures for assessing intelligibility. The aim of this study was to construct a single-word intelligibility test for speakers with cleft palate. The test used a multiple-choice identification format, and was based on phonetic contrasts which are problematic for speakers with cleft palate. Fifteen Cantonese speakers with repaired cleft palate served as speakers. The intelligibility score of each speaker was calculated, based on the number of words correctly identified by eight naive listeners. The most problematic contrasts, based on mean error proportions, were place of articulation (stops and nasals), stop versus fricative, and stop versus affricate. The most robust contrasts were also determined, and physiological and language-specific interpretations offered. Single-word intelligibility could be predicted with 91% accuracy using three phonetic contrasts. The importance of an 'explanatory' intelligibility test, for focusing treatment and monitoring severity, is discussed.

Adolescent↗
PubMed2002

Genetic and environmental influences on the development of intelligence.

Measures of intelligence were collected in 209 twin pairs at 5, 7, 10, and 12 years of age, as part of a longitudinal project on intelligence, brain function, and behavioral problems. Intelligence was measured at 5, 7, and 10 years of age with the RAKIT, a well-known Dutch intelligence test, consisting of 6 subscales. At 12 years of age, the complete WISC-R was administered (12 subscales). Both intelligence tests resulted in a measure of full-scale IQ (FSIQ). Participation rate is around 93% at age 12. Correlation coefficients over time are high: (r(5-7) = .65; r(5-10) = .65; r(5-12) = .64; r(7-10) = .72; r(7-12) = .69 and r(10-12) = .78). Genetic analyses show significant heritabilities at all ages, with the expected increase of genetic influences and decrease of shared environmental influences over the years. Genetic influences seem to be the main driving force behind continuity in general cognitive ability, represented by a common factor influencing FSIQ at all ages. Shared environmental influences are responsible for stability as well as change in the development of cognitive abilities, represented by a common factor influencing FSIQ at all ages and age-specific influences, respectively.

Child↗
PubMed1985

Hearing disorder and cognitive function of individuals with Down syndrome.

The relationship between hearing disorder and performance on intelligence tests among 28 children and young adults with Down syndrome was investigated. Intellectual and audiological assessments were obtained and evaluated in a multiple regression analysis. Performance on intelligence tests by individuals with abnormal tympanograms was inferior to that of individuals with normal tympanograms. Hearing sensitivity measures were uncorrelated. Findings suggest the need for an awareness of the potential impact of middle ear disorder when assessing intellectual functioning and the importance of otological care for infants and young children with Down syndrome.

Acoustic Impedance Tests↗