A chronometric study of mental addition in profoundly deaf children

In attempting to account for inferior mathematical attainment among deaf children of all ages, some researchers have proposed that observed deficits may be partly the result of an absence of vocalization and subvocalization in the acquisition and execution of arithmetic by the deaf. When performing mental arithmetic, hearing children, it is claimed, rely on covert counting mechanisms based on internalized speech, while their deaf counterparts, due to a lack of articulatory prowess, are unable to utilize such mechanisms and instead are forced to adopt other less effective methods based on associative retrieval of arithmetical facts from long-term memory. The present study sought to throw light on these assertions. Ten prelingually profoundly deaf 12-13-year-olds, and 10 hearing controls were required to solve the 100 simple addition combinations. Analysis of response times revealed strong similarities between the two groups, with all children appearing to employ mechanisms based on covert counting. Implications of the present results are discussed in the light of previous findings.     

The Role of Individual Differences in the Accuracy of Confidence Judgments

Generally, self-assessment of accuracy in the cognitive domain produces overconfidence, whereas self-assessment of visual perceptual judgments results in under-confidence. Despite contrary empirical evidence, in models attempting to explain those phenomena, individual differences have often been disregarded. The authors report on 2 studies in which that shortcoming was addressed. In Experiment 1, participants (N = 520) completed a large number of cognitive-ability tests. Results indicated that individual differences provide a meaningful source of overconfidence and that a metacognitive trait might mediate that effect. In further analysis, there was only a relatively small correlation between test accuracy and confidence bias. In Experiment 2 (N = 107 participants), both perceptual and cognitive ability tests were included, along with measures of personality. Results again indicated the presence of a confidence factor that transcended the nature of the testing vehicle. Furthermore, a small relationship was found between that factor and some self-reported personality measures. Thus, personality traits and cognitive ability appeared to play only a small role in determining the accuracy of self-assessment. Collectively, the present results suggest that there are multiple causes of miscalibration, which current models of over- and underconfidence fail to encompass.     

Psychological effects of permanently implanted false teeth: A 2-year follow-up and comparison with dentate patients

Abstract

The treatment of patients who have suffered total tooth loss (edentulism) has always posed many problems in dental care, since removable dentures cannot restore function completely and can often result in pain and mouth ulcers. An important recent advance is the development of “osseointegrated implants”. This technique involves the insertion of titanium screws into the jawbone and the denture is then attached to this fixed bridge. A previous controlled study (Kent and Johns, 1991) has shown that in the short term this technique is associated with a reduction in psychological distress and the number of dentally disabling symptoms, but no change in self-esteem. The aims of the current study were to (a) conduct a longer-term follow-up of these patients (the implant group) and (b) compare their adjustment with patients who possess their natural teeth (the dentate group). Twenty implant patients completed the General Health Questionnaire (GHQ), Rosenberg's self-esteem scale (Rosenberg, 1965) and a check-list of disabling symptoms on three occasions: before treatment, six months and 24 months post-treatment. Sixty-one dentate patients from four general dental practices completed the same questionnaires on a single occasion. In the implant group at 24 months, the number of psychological symptoms (GHQ) had returned to the pre-treatment level, even though the reduction in the number of disabling symptoms was maintained. Self-esteem remained unchanged. There was considerable individual variation in changes in GHQ scores, although, on average, the implant group's level of well-being at 24 months was similar to the dentate patients' on all measures.     

Attention Deficits in Children with < 750 gm Birth Weight

Although attention deficit disorders are frequently diagnosed in low birth-weight children, it is not clear if attention problems are apparent in neuropsychological testing. The present study examined the performances of a regional sample of 68 children with birth weights <750 gm on several psychometric measures of attention given at early school age. Matched groups of 65 children with birth weights between 750–1499 gm and 61 term controls were also assessed. The group <750 gm performed more poorly on one attention test than did either comparison group, even when overall cognitive ability was taken into account. Performances on the attention tests were also related to academic skills and ratings of behavior. Findings confirm the hypothesis that children with birth weights <750 gm have specific attentional weaknesses and support the validity of attention tests as predictors of learning and behavior problems.     

Prevalence and Correlates of Depressive Symptoms Following Traumatic Brain Injuries in Children

The prevalence and correlates of depressive symptoms following childhood traumatic brain injuries (TBI) were examined using data drawn from a prospective longitudinal study. Participants included 38 children with severe TBI, 51 with moderate TBI, and 55 with orthopedic injuries (OI). Assessments occurred shortly after injury (baseline) and at 6- and 12-month follow-ups. Children completed the Child Depression Inventory (CDI). Parents rated depressive symptoms using the Child Behavior Checklist (CBC), with baseline ratings reflecting premorbid status. Assessments also included measures of children's neurocognitive functioning and the family environment. The three groups did not differ overall in self-reported symptoms on the CDI, but did display different trends over time. The three groups did not differ on parent ratings of premorbid depressive symptoms on the CBC, but parents reported more depressive symptoms in the TBI groups than in the OI group at 6- and 12-month follow-ups. Child and parent reports were correlated for children in the TBI groups, but not for those in the OI group. Depressive symptoms were related to socioeconomic status in all groups. Socioeconomic status also was a significant moderator of group differences, such that the effects of TBI were exacerbated in children from more disadvantaged homes. Although self-reports of depressive symptoms were related inconsistently to children's verbal memory, parent reports of depressive symptoms were unrelated to IQ or verbal memory. The findings suggest that TBI increases the risk of depressive symptoms, especially among more socially disadvantaged children, and that depressive symptoms are not strongly related to post-injury neurocognitive deficits.     

A mediating role for anticipated regret in predicting retirement savings intention between groups with (without) past behaviour

A recent global trend has been the shifting of responsibility for retirement income planning from the public purse to individuals, with an associated encouragement to contribute more to retirement savings. This research investigated the influence of anticipated regret on the intention to make extra voluntary retirement savings. Results revealed that anticipated regret plays a powerful affective role in the formation of behavioural intention by conveying the influence of attitude and subjective norm to intention. Implications of the results with respect to possible interventions relating to behaviour change are considered.     

Boundary Conditions of the High‐Investment Human Resource Systems‐Small‐Firm Labor Productivity Relationship

Although a few published, multiindustry, firm‐level, empirical studies have linked systems of high‐investment or high‐performance human resource management practices to enhanced small‐firm performance, this stream of strategic human resource management research is underdeveloped and equivocal. Accordingly, in this study, we use a sample of for‐profit, private‐sector, small Canadian firms with fewer than 100 employees from a variety of industry sectors to examine boundary conditions of the relationship between firm‐level high‐investment human resource systems and objective small‐firm labor productivity. Congruent with contingency theory, this study's results indicate that the extent and nature of the influence of high‐investment human resource systems on objective small‐firm labor productivity is contingent on internal (differentiation strategy and firm capital intensity) and external boundary conditions (industry dynamism and industry growth). Implications and limitations of this research study as well as avenues for future research are discussed.     

A DILEMMA FOR SINNOTT-ARMSTRONG'S MODERATE PYRRHONIAN MORAL SCEPTICISM

In order for us to have epistemic justification, Sinnott-Armstrong believes we do not have to be able to rule out all sceptical hypotheses. He suggests that it is sufficient if we have 'modestly justified beliefs', i.e., if our evidence rules out all non-sceptical alternatives. I argue that modest justification is not sufficient for epistemic justification. Either modest justification is independent of our ability to rule out sceptical hypotheses, but is not a kind of epistemic justification, or else modest justification is a kind of epistemic justification, but is not truly independent of our ability to rule out sceptical hypotheses.     

The importance of impulse purchasing behaviour in the international airport environment

Airports are unique retail environments due to the environmental and psychological issues linked with the travel process. Travellers experience feelings of anxiety, stress and excitement which make them react in unusual ways. Airport retail environments therefore differ from more day‐to‐day channels of distribution. Consequently, retailers' approaches must also differ in order to maximise performance. There is evidence of a considerable impulse purchasing effect in airport retail operations which, if understood and harnessed by airport retailers, can enhance performance. The impulse effects will differ significantly between customer segments due to both the psychological effects of the travel experience and the existence of normative traits. Retailers must create an environment that minimises inherent stress and accentuates or at least maintains natural levels of excitement, while also virtuously motivating impulse purchasing by reducing or eliminating barriers to purchase. Development of an impulse strategy, which should permeate all elements of airport retail activities, is essential for maximising performance and profitability. Copyright © 2002 Henry Stewart Publications Ltd.