A specific calculating ability

We report two experiments that investigate the calculating strategy used by a low IQ savant to identify prime numbers. Hermelin and O'Connor (1990) had suggested previously that this subject may use a procedure first described by Eratosthenes to detect a prime number, namely, dividing a target number by all primes up to the square root of the target number and testing for a remainder. In the first experiment, we compare the reaction times of the savant to decide whether a number is prime with those of a control subject proficient in mathematical calculation. In addition, we measured the savant's speed of information processing using an inspection time task. We found that the reaction times of the savant, although generally faster, followed the same pattern of the control subject who reported using the Eratosthenes procedure. The savant's inspection time indicated that his speed of processing was far superior to that expected from someone of his IQ. In the second experiment, we measured the time it takes mathematics students to divide by different prime numbers and we also tested them on the prime identification task. We used their division times to simulate their performance on the prime number identification task under the assumption that they used the Eratosthenes procedure. We also simulated the reaction times that would result from a simple memory-based procedure for identifying primes. We found that the Eratosthenes simulation, in contrast to the memory simulation, provided a good fit to both the students' and the savant's reaction times. We conclude that the savant is using a complex computational algorithm to identify primes and suggest two explanations of how the apparent contradiction between his low general intelligence and his superior numerical ability might be resolved.     

Modularity,mental retardation and speed of processing

This paper briefly outlines Anderson's (1992) theory of the minimal cognitive architecture underlying intelligence and development and briefly discusses its application to understanding mental retardation and specific cognitive deficits. An experiment on the relationship between face perception and mental retardation serves as an illustration of how the theory might be informative about the relationship between intelligence and cognitive architecture.     

Characteristics of the relapse situation of alcoholics treated with aversion conditioning

Recently, there has been considerable interest in applying the principles of learning theory and operant conditioning to the problems of alcoholism. One principle which may be of value is stimulus control. The principle of stimulus control would suggest that there should be some degree of similarity between the environmental circumstances in which alcoholics do their drinking and the situation where they take their first, post-treatment, drink. The principle of stimulus control also suggests that alcoholics treated with aversion therapy would tend to relapse under environmental conditions that were in some way different from their usual drinking environments.Whether we are able to observe a difference in drinking environments before and after treatment depends on whether we have selected the appropriate stimulus dimensions. The present author is in agreement with Lunde and Vogler (1970) who suggest that; types of liquor consumed; drinking associates; whether at home alone, with others or at a bar; are some of the important characteristics of an alcoholic's learning history. These stimulus conditions could be further simplified to location, type of beverage and social or non-social drinking.Since it is physically impossible to turn time backwards or to have observers follow patients everywhere they go, we must rely on self-reports of alcoholics about their drinking history. Although many clinicians have reservations about the veracity of alcoholics. Guze et al. (1963) report that 97 per cent of alcoholics in a prison population could be correctly diagnosed from their own self-report. Thus, it appears that at least when interviewed in the context of a research study where no contingencies are placed on their behavior, verbal or otherwise, self-report by alcoholics can indeed be reliable. The present study examined the relapse situation of alcoholics in terms of the location of the first drink episode, the social environment, and type of beverage consumed and compared this situation to the usual (most frequent) drinking situation prior to treatment.     

Discrepancy in Personality Perceptions Is Related to Relationship Satisfaction: Findings from Dyadic Latent Discrepancy Analyses

The current study investigated discrepancies in self‐, partner‐, and meta‐perceptions of the Big Five traits and their associations with relationship satisfaction in intimate couples. The study was based on a subsample of the Swiss study “Co‐Development in Personality: Longitudinal Approaches to Personality Development in Dyads Across the Life Span” (CoDiP) including cross‐sectional data of 216 heterosexual couples. We adapted the Latent Congruence Model (LCM) for the study of discrepancies in personality perceptions in dyads. Beyond personality trait levels, the discrepancies between self‐ and partner‐perceptions and between partner‐ and meta‐perceptions of the Big Five traits were related to relationship satisfaction as actor and partner effects. In general, flattering and favorable partner‐perceptions in relation to self‐ and meta‐perceptions seem to positively contribute to relationship satisfaction. The present study implies that not only personality trait levels but also discrepancies between personality perceptions are important for understanding relationship satisfaction.     

Can Word Puzzles be Tailored to Improve Different Dimensions of Verbal Fluency? A Report of an Intervention Study

Verbal fluency is commonly used as a proxy measure of executive functioning, as it involves cognitive flexibility, working memory, and inhibitory control. Previous research has demonstrated that crosswords can be a useful means of improving verbal fluency, results consistent with the cognitive reserve hypothesis; the form of verbal fluency affected has, however, differed across studies. The present study sought to assess the extent to which it was possible to target phonemic (PVF) and semantic verbal fluency (SVF) separately through word puzzles designed to focus on semantic/thematic and structural clues respectively. Fifty-three university students were randomly assigned to one of three groups: semantic/thematic, structural, or a daily diary control group. They were assessed on PVF and SVF at baseline, and immediately following a four-week intervention. Age, sex, and depression scores were controlled for. A 2 × 3 mixed ANCOVA showed that the structural group improved significantly more in PVF during the intervention period than did the semantic/thematic or control groups, with the improvement linked to improved switching performance. The effect size was large. No significant difference in improvement in SVF emerged, although the effect size was moderate. The findings support the notion that it is possible to improve specific forms of verbal fluency through tailored brief word-puzzle interventions.     

A Guide to Conducting a Meta-Analysis

Meta-analysis is widely accepted as the preferred method to synthesize research findings in various disciplines. This paper provides an introduction to when and how to conduct a meta-analysis. Several practical questions, such as advantages of meta-analysis over conventional narrative review and the number of studies required for a meta-analysis, are addressed. Common meta-analytic models are then introduced. An artificial dataset is used to illustrate how a meta-analysis is conducted in several software packages. The paper concludes with some common pitfalls of meta-analysis and their solutions. The primary goal of this paper is to provide a summary background to readers who would like to conduct their first meta-analytic study.     

Youth Self-Views,Coping with Stress,and Behavioral/Emotional Problems: The Role of Incremental Self-Theory

Previous research has established associations between stress and coping processes and internalizing and externalizing problems among adolescents and emerging adults. The purpose of the present study was to integrate this literature with research demonstrating the importance of self-theory—views that individuals hold about themselves and their abilities. We examined the extent to which self-theory may influence both coping processes and internalizing and externalizing problems among adolescents and emerging adults. Using moderated mediation, we tested whether coping serves as a mechanism through which self-theory of both intelligence and personality influences internalizing and externalizing problems among adolescents and emerging adults. One hundred and forty participants (adolescents aged 14–17; emerging adults aged 18–30; 60 % female; 8.5 % ethnic minority) completed questionnaires on self-theory, coping responses, and behavioral/emotional problems. Results of moderated mediation analyses were consistent with coping as a mechanism through which self-theory influences psychopathology symptoms such that more malleable beliefs are associated with increased productive coping strategies and lower levels of internalizing and externalizing problems. The current findings also indicate that these associations were significant for adolescents but not for emerging adults. Although cross-sectional, findings suggest that fostering malleable beliefs among adolescents may increase the use of productive coping strategies and positively influence adjustment.     

Probabilities,causation, and logic programming in conditional reasoning: reply to Stenning and Van Lambalgen (2016)

Oaksford and Chater (2014 Oaksford, M., &; Chater, N. (2014). Probabilistic single function dual process theory and logic programming as approaches to non-monotonicity in human vs. artificial reasoning. Thinking and Reasoning, 20, 269–295. doi:10.1080/13546783.2013.877401[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar], Thinking and Reasoning, 20, 269–295) critiqued the logic programming (LP) approach to nonmonotonicity and proposed that a Bayesian probabilistic approach to conditional reasoning provided a more empirically adequate theory. The current paper is a reply to Stenning and van Lambalgen's rejoinder to this earlier paper entitled ‘Logic programming, probability, and two-system accounts of reasoning: a rejoinder to Oaksford and Chater’ (2016) in Thinking and Reasoning. It is argued that causation is basic in human cognition and that explaining how abnormality lists are created in LP requires causal models. Each specific rejoinder to the original critique is then addressed. While many areas of agreement are identified, with respect to the key differences, it is concluded the current evidence favours the Bayesian approach, at least for the moment.