Moderate level alcohol during pregnancy, prenatal stress, or both and limbic-hypothalamic-pituitary-adrenocortical axis response to stress in rhesus monkeys

This study examined the relationship between moderate-level prenatal alcohol exposure, prenatal stress, and postnatal response to a challenging event in 6-month-old rhesus monkeys. Forty-one rhesus monkey (Macaca mulatta) infants were exposed prenatally to moderate level alcohol, maternal stress, or both. Offspring plasma cortisol and adrenocorticotrophic hormone (ACTH) were determined from blood samples before maternal separation and after separation. Behavioral observations were made repeatedly across separation. Moderate-level prenatal alcohol exposure was associated with significantly higher plasma ACTH response to maternal separation. Offspring exposed to prenatal alcohol, prenatal stress, and prenatal alcohol and stress showed reduced behavioral adaptation to stress compared with controls. Baseline, 2-hr, and 26-hr plasma ACTH levels were intercorrelated and predicted behavior during separation.     

Brain Activity During Performance of Naming Tasks: Comparison Between Dyslexic and Regular Readers

This research was aimed at contributing to the current understanding of the underlying factors of naming speed and the causes of naming speed deficits. Forty regular readers and 40 dyslexic university students participated in the study. Electrophysiological (Event-Related Potentials [ERPs]) and behavioral measures were employed. Behavioral baseline tasks assessed general ability, reading skills, reading-related cognitive abilities, and standard Rapid Automatized Naming (RAN) and Rapid Alternating Stimulus tests. ERP tasks included letter and object naming tasks adapted for electrophysiological research presentation. The dyslexics were significantly slower and less accurate than the controls on most of the baseline measures. On all the naming tasks, the peak ERP latencies were elicited later, reaction times were longer, and the P300 latency width was wider among the dyslexics as compared to the regular readers. On the choice reaction time naming tasks, accuracy for both groups was almost perfect. When naming presentation time was controlled by the experiment, the dyslexics were significantly less accurate than the controls. Our data indicated that effective naming speed was related to an earlier P200 latency peak among regular readers and to an earlier P300 latency peak and narrower area component activation in the dyslexic group. The results from this study suggest that effective RAN speed among regular readers might be a result of efficient processing of RAN information at the input stage of stimulis perception and evaluation as well as of updating and processing the information in short-term memory among dyslexics.     

Antecedents of Maternal Sensitivity During Distressing Tasks: Integrating Attachment,Social Information Processing,and Psychobiological Perspectives

Predictors of maternal sensitivity to infant distress were examined among 259 primiparous mothers. The Adult Attachment Interview, self‐reports of personality and emotional functioning, and measures of physiological, emotional, and cognitive responses to videotapes of crying infants were administered prenatally. Maternal sensitivity was observed during three distress‐eliciting tasks when infants were 6 months old. Coherence of mind was directly associated with higher maternal sensitivity to distress. Mothers' heightened emotional risk was indirectly associated with lower sensitivity via mothers' self‐focused and negative processing of infant cry cues. Likewise, high physiological arousal accompanied by poor physiological regulation in response to infant crying was indirectly associated with lower maternal sensitivity to distress through mothers' self‐focused and negative processing of infant cry cues.     

Prenatal Alcohol Exposure,Child Externalizing Behavior,and Maternal Stress

Objective. This study examined linkages between prenatal exposure to alcohol, current maternal alcohol use, child externalizing behavior, and maternal stress in a sample of 4- to 6-year-old children and their mothers. Design. Questionnaires, interviews, and behavioral observations were used to assess study variables in 42 mother - child dyads. Results. Current maternal alcohol use did not relate to children's behavior problems. However, children with higher levels of prenatal exposure to alcohol exhibited more externalizing behavior. In turn, higher levels of child externalizing behavior were associated with increased maternal stress. An alternative model, in which maternal stress was assumed to relate to less supportive mother - child interactions and higher levels of current maternal alcohol consumption, which in turn were expected to relate to higher rates of child externalizing behavior, did not fit the data. Conclusions. The impact of prenatal alcohol exposure likely extends to caregivers. Interventions must focus not only on affected individuals but also on their families, who may experience significant stress in trying to care for such individuals.     

Cognitive processing rates among disabled and normal reading young adults: A nine year follow-up study

Forty adults who had been diagnosed as reading disabled when they were children and 40 adults from a matched control group of normal readers were tested to assess the diagnostic utility of a newly developed set of tests as well at to ascertain whether or not reading disability persists into early adulthood. The new measures, designed to examine cognitive processing rates in disabled and normal adult readers, included expressive verbal fluency, confrontation naming, and perceptual speed. Evidence for significantly slower cognitive processing rates and persistent problems in reading and spelling was apparent among the young adult disabled readers. Spatial and mathematical ability levels were well within the normal range.     

Updating and Not Shifting Predicts Learning Performance in Young and Middle‐Aged Adults

The goal of this study was to investigate whether single executive function (EF) tests were predictive for learning performance in mainly young and middle‐aged adults. The tests measured shifting and updating. Processing speed was also measured. In an observational study, cognitive performance and learning performance were measured objectively in 851 adult students and analyzed using multiple linear regression. EFs and processing speed were measured via cognitive tests. Learning performance was evaluated after 14 months. The results show that updating performance is predictive for learning performance, with a small effect size, while shifting performance was not. This means that a single updating test has predictive value for learning performance acquired over a longer period of time. However, as the effect size is rather small, the test on its own does not serve as a proper selection tool for determining whether a student will be successful or not.     

Information processing deficits in children with attention-deficit/hyperactivity disorder, inattentive type, and children with reading disability

We examined the information processing capabilities of children diagnosed with the inattentive subtype of attention-deficit/hyperactivity disorder (ADHD) who had been characterized as having a sluggish cognitive tempo. Children referred for school-related problems (n = 81) and nonreferred community controls (n = 149) participated. Of the referred children, 24 met criteria for ADHD, 42 met criteria for reading disability (RD), and 9 of these were comorbid for RD and ADHD. Children with ADHD differed from those without ADHD on a visual search task but not on an auditory processing task; the reverse was true for children with RD. Decomposition of the visual search task into component operations demonstrated that children in the ADHD group had a slow processing rate that was not attributable to inattention. The children with ADHD were not globally poor at information processing or inattentive, but they demonstrated diminished speed of visual processing.     

Modeling teachers’ reactions to unexpectedness

BackgroundEven experienced teachers make inconsistent classroom decisions in unexpected situations. From the cognitive load theory perspective, the effective handling of the novel, unexpected events by teachers depends on the cognitive load of the task, the teaching context in which the unexpectedness appears, and the available cognitive capacity.AimsTeachers’ reactions to unexpected mathematical events, in particular the unexpectedness of the arithmetic calculation, was modeled, investigated experimentally, and explained within the theoretical framework of cognitive load theory.Sample64 mathematics teacher trainees took part in the experiment.MethodsIn a dual-task arrangement, participants verified alternative answers to simple mathematical questions while memorizing task-irrelevant information. The answers represented low (schematic good responses), and high (unexpected good responses) processing load conditions, and control condition (incorrect responses). The memory load was low or high representing levels of extraneous load. The participants’ cognitive capacity was estimated by a complex working memory span task.ResultsThe verification of unexpected but correct answers was slow and more error-prone as compared with the processing speed and accuracy of schematic answers, presumably due to elevated processing (intrinsic) load. The increase in memory load resulted in slower and more inaccurate verifications. However, working memory capacity was found to mediate the extraneous load effect.ConclusionsThe results stress the importance of well-organized schemas for effective reactions to unexpected classroom events. Furthermore, it highlights the importance of accurately understanding and being aware of the impact of cognitive load on teachers to improve teaching practice.     

Differential effects of prenatal rhythmic stimulation on neonatal arousal states.

This study tested Salk's hypothesis that the human fetus is prenatally imprinted to the repetitive intermittent sound of the maternal heartbeat. 2 groups of neonates were selected prior to birth based on low (70-80 bpm) and high (100-110 bpm) maternal resting heart rates. At 24-48 hours old, the neonates were exposed to a 75-bpm, 105-bpm, or a no-sound tape, each prior to 1 of 3 different mealtimes. The prediction, based on Salk's hypothesis, that neonates would quiet most to their own mother's heart rate compared with the unfamiliar heart rate was not supported. Greater arousal reduction was found for any rhythmic sound compared with no sound. M-st important, clear prenatal influences on postnatal quieting behavior were demonstrated. Babies born to low-heart-rate mothers fell asleep faster, slept longer, and cried less under all conditions than did high-maternal-heart-rate children.     

Attainment of skill in using science processes II. Grade and task effects

Two studies were used to examine developmental and task effects in estimation problems. Time to solution data were collected on students' performance to describe their efficiency in processing information. Study One demonstrated developmental differences in speed of processing between younger students (first grade) and older students (third and sixth grade), with younger students performing at a slower rate. Study Two demonstrated that the amount of feedback information present influenced speed of processing. Results were discussed in terms of student and task characteristics and the implications of such variables for an information processing model of learning. Implications for science teaching were also discussed in terms of diagnosing learning problems and designing science curriculum.     

Effect of Maternal Social Support on Attachment: Experimental Evidence

The present study used an experimental format to evaluate the influence of maternal social support on the development of attachment. 46 WIC primigravidas were randomly assigned to an experimental or control condition. Volunteer coaches, trained to provide maternal support and information, met with experimentals prenatally and during the first postpartum year. Experimentals and controls did not differ on demographics, ego level, verbal ability, affect, or perceived social support. At 14 months, experimental infants scored higher on an Attachment Ratings cluster from Waters and Deane's new Q-sort procedure. This cluster was more sensitive than a Criterion Sort measure in detecting the effect of the manipulation and as or more sensitive to maternal affect, perceived support, and the HOME. These findings provide experimental evidence regarding the importance of social support on infant attachment and support for an alternative approach for reducing data from the attachment Q-sort.     

Memory and Processing Speed in Preterm Children at Eleven Years: A Comparison with Full-Terms

This study examined the effects of prematurity on 11-year-olds' performance on 2 specific aspects of cognition—memory and processing speed, using a new computer-administered battery, the Cognitive Abilities Test (CAT: Detterman). Preterms performed more poorly than their full-term controls on all memory tasks; this relative deficit was associated with the presence and severity of neonatal Respiratory Distress Syndrome (RDS). Preterms were also slower on selected aspects of processing speed but not on motor speed. Memory and processing speed, taken together, accounted for much of the 10-point difference in WISC-R IQ between groups.     

Influence of postpartum shock controllability on subsequent maternal behavior in rats

Responses of mother rats were observed 24 h before and 24 and 72 h after exposure to one of three 8-day postpartum treatments: shock escape training, yoked inescapable shock, or restrained with no shock. In contrast to those in the other two groups, the dams given inescapable shock showed slower speed to approach the nest, shorter durations of being on the nest, and lower frequency and shorter total duration of oral contact with their pups. These dams also retrieved their pups less frequently, but this measure, as well as the frequency of leaving the nest, did not result in significant differences between groups. Since the traditional interpretations of the learned-helplessness effect were not entirely able to account for these findings, the observed uncontrollable-stress-produced changes in maternal behavior were examined from an ethological perspective.     

Pathways from prematurity and infant abilities to later cognition

This study examined the relation of information processing in 7-month-old preterms (<1750 g at birth) and full-terms to Bayley Mental Development Indexes (MDIs) at 2 and 3 years. The infant measures were drawn from four cognitive domains: attention, speed, memory, and representational competence. Structural equation modeling showed that these measures of infant information processing mediated the effects of prematurity, and that there was a cascade of effects, with infant processing speed influencing memory and representational competence, which in turn influenced later MDI. This study shows that infant information processing mediates the effect of prematurity on later cognition, and delineates pathways whereby infant abilities relate to one another and to later outcome.     

Individual differences in speed of mental processing and human cognitive abilities: Toward a taxonomic model

Extensive research within the field of learning and individual differences focuses upon the relationship between general intelligence and process measures derived from elementary cognitive tasks (ECTs). This emphasis has ignored data indicating that cognitive abilities are best described by three levels (or strata). It has also been suggested that mental speed is a unitary construct, although it is more likely to have a complex structure. To address shortcomings evident in this literature, a multivariate investigation (N = 179) was conducted. Factor analysis of 25 psychometric indices gave seven factors postulated under the theory of fluid (G_f) and crystallized (G_c) intelligence. Correlations between cognitive abilities and parameters derived from 11 ECTs indicated that G_f (alone) was related to processing speed. This relationship is seemingly dependent upon experimental manipulations of task complexity. Regarding the factorial structure of mental speed, the results were unequivocal: Broad second-order factors may be derived from both ECTs and psychometric tests. These constructs are independent from abilities defined by accuracy scores and collectively define a general cognitive speed factor. Implications of these findings are discussed. It would appear that mental speed is more intricate than proposed, and that cognitive complexity (reflected in stimulus-response compatibility effects) plays a crucial role in its ontogenesis. In addition, several explanatory models linking intelligence to processing speed are untenable. It is likely that the search for a basic process of intelligence by means of mental speed frameworks (alone) is misguided.Recently, within the field of individual differences, there has been “an explosion of experimental studies into the speed of mental processes” (H.J. Eysenck 1995, p. 225). Various tasks, ranging from those paradigms assessing simple, psychomotor movements and on up through to measures of complex problem solving and psychometric test performance, have been employed (Stankov & Roberts 1997). The present study was designed to explore speed of processing constructs within a structural model of human cognitive abilities. Utilizing the evidence presented in Carroll's (1993) extensive reanalysis of the main data sets collected within the psychometric discipline this century, the structural model of cognitive abilities adopted is that known as the theory of fluid and crystallized intelligence (see Horn & Noll 1994; Stankov et al. 1995). In contrast, the mental speed measures selected for investigation in this study were chosen on the basis of both experimental and psychometric findings that rely on disparate accounts (e.g., information theory). Notably, mental speed constructs are not presently encapsulated within a single unifying model. Another major aim of the present study was to redress this imbalance by establishing a rapprochement between conceptual models of mental speed and human cognitive abilities.     

Habituation and maternal encouragement of attention in infancy as predictors of toddler language, play, and representational competence

In a longitudinal study, infants' habituation and mothers' encouragement of attention were assessed at 5 months, and toddlers' language comprehension, language production, and pretense play and mothers' encouragement of attention were assessed at 13 months. Structural equation modeling was used to examine the unique contributions of infant habituation and maternal stimulation to toddlers' cognitive abilities. Habituation predicted language comprehension, pretense play, and a latent variable of language and play after the influences of both 5- and 13-month maternal encouragement of attention were partialed. Likewise, early maternal encouragement of attention explained unique variance in toddlers' language comprehension and the language-and-play latent variable after infant habituation was controlled. These findings indicate that links between early habituation and later cognitive development are direct and not solely mediated by maternal stimulation, and that maternal stimulation of young infants influences the development of children's representational competence over and above infants' own information-processing abilities.     

An Exploration of the Interaction between Speech Rate,Gender, and Cognitive Style in their Effect on Recall

This paper explores how the interaction between cognitive style, gender, and type of task predicts task outcome, particularly when presentation speed is varied. A sample of 91 11‐year‐old pupils completed the Cognitive Style Analysis. Pupils were assigned to one of two groups balanced for gender and cognitive style. Group 1 listened to a recording of a passage presented at 84wpm; Group 2 listened to the same passage at 197wpm. Pupils were then required to comprehend and recall information from the passage that required assimilation of distantly positioned information. Male verbalisers and female imagers performed well in the slow condition but poorly in the fast condition. Female verbalisers showed improved performance in the fast condition. Results indicate that the interaction between verbal–imagery style and gender predicts the outcome of verbal tasks, especially when processing speed is restricted. These results support differences in information processing between genders and also suggest that this processing is mediated by verbal–imagery cognitive style.     

Visual processing of verbal and nonverbal stimuli in adolescents with reading disabilities

This study investigated whether a group of children with reading disabilities (RD) were slower at processing visual information in general (compared to a group of children of comparable age and a group of children of comparable reading level), or whether their deficit was specific to the written word. Computerized backward masking and temporal integration tasks were used to assess the speed of visual information processing. Stimulus complexity (simple, complex) and type (verbal, nonverbal) were varied, creating a 2 x 2 matrix of stimulus conditions: simple nonverbal, complex nonverbal, simple verbal, and complex verbal. Adolescents with RD demonstrated difficulties in processing rapidly presented verbal and nonverbal visual stimuli, although the effect was magnified when they were processing verbal stimuli. Thus, the results of this study suggest that some youth with reading disabilities have visual temporal processing deficits that compound difficulties in processing verbal information during reading.     

Mathematical development: the role of broad cognitive processes

This study investigated the role of broad cognitive processes in the development of mathematics skills among children and adolescents. Four hundred and forty-seven students (age mean [M] = 10.23 years, 73% boys and 27% girls) from an elementary school district in the US southwest participated. Structural equation modelling tests indicated that calculation complexity was predicted by long-term retrieval and working memory; calculation fluency was predicted by perceptual processing speed, phonetic coding, and visual processing; problem solving was predicted by fluid reasoning, crystallised knowledge, working memory, and perceptual processing speed. Younger students’ problem solving skills were more strongly associated with fluid reasoning skills, relative to older students. Conversely, older students’ problem solving skills were more strongly associated with crystallised knowledge skills, relative to younger students. Findings are consistent with the theoretical suggestion that broad cognitive processes play specific roles in the development of mathematical skills among children and adolescents. Implications for educational psychologists are discussed.     

The Timing of Prenatal Exposure to Maternal Cortisol and Psychosocial Stress Is Associated With Human Infant Cognitive Development

The consequences of prenatal maternal stress for development were examined in 125 full-term infants at 3, 6, and 12 months of age. Maternal cortisol and psychological state were evaluated 5 times during pregnancy. Exposure to elevated concentrations of cortisol early in gestation was associated with a slower rate of development over the 1st year and lower mental development scores at 12 months. Elevated levels of maternal cortisol late in gestation, however, were associated with accelerated cognitive development and higher scores at 12 months. Elevated levels of maternal pregnancy-specific anxiety early in pregnancy were independently associated with lower 12-month mental development scores. These data suggest that maternal cortisol and pregnancy-specific anxiety have programming influences on the developing fetus.