Socioeconomic status modifies the sex difference in spatial skill

We examined whether the male spatial advantage varies across children from different socioeconomic (SES) groups. In a longitudinal study, children were administered two spatial tasks requiring mental transformations and a syntax comprehension task in the fall and spring of second and third grades. Boys from middle- and high-SES backgrounds outperformed their female counterparts on both spatial tasks, whereas boys and girls from a low-SES group did not differ in their performance level on these tasks. As expected, no sex differences were found on the verbal comprehension task. Prior studies have generally been based on the assumption that the male spatial advantage reflects ability differences in the population as a whole. Our finding that the advantage is sensitive to variations in SES provides a challenge to this assumption, and has implications for a successful explanation of the sex-related difference in spatial skill.     

An 8q21 deletion in a patient with comorbid psychosis and mental retardation

Systematic investigations indicate that some of the recognized psychiatric disorders can be identified among those with mental retardation due to chromosomal abnormalities. We report a psychotic patient with mild mental retardation (intelligence quotient: 68) and minor anomalies that had a chromosomal aberration not previously described in a psychotic patient. Our patient highlights the importance of the cytogenetic study in psychiatric patients with comorbid mental retardation or minor anomalies. In addition, her psychosis symptoms may be helpful to propose a new candidate gene for psychosis.     

Reasoning counterfactually: Combining and rending

Counterfactual reasoning occurs when people are asked to assume for the sake of argument that a fact they previously thought was true is now false and to draw a conclusion on that basis. To accomplish this sort of reasoning requires a revising of one's beliefs, which was simulated in the present study. Students were shown a set of statements that they were to assure themselves was consistent. They were then asked to accept a counterfactual assumption as true and reconcile resulting inconsistencies among the set of statements. In these problems, one statement is a generality (e.g., All trees on the plaza are elms), another is a particular (e.g., This tree is a pine), and one is a counterfactual (e.g., Assume this tree is on the plaza). Students preferred to reconcile the inconsistency by identifying the generality as "true" and the particular as "false." They did this more often when the assumption combined categories than when it dislodged categories and when real beliefs were at stake rather than arbitrary generalities. This study tested current models of inference for their ability to account for counterfactual reasoning and found the results to be consistent with natural deduction system, mental models, and conceptual-integration network approaches to everyday reasoning.     

Self-consciousness,role discrepancy,and depressive affect

Abstract

Two studies were conducted to test the hypothesis that depressive affect is a joint function of private self-consciousness and the extent to which an individual's self-concept is discrepant from the requirements of a significant role. In the first study, the role of college student was empirically defined using a technique developed by Burke and Tully (1977). As predicted, the discrepancy between this role definition and subjects' self-ratings was a more significant predictor of depressive affect among high than low private self-conscious individuals. In the second study, measurements were taken at two time periods that were spaced six weeks apart. In a replication of the results of Study 1, the discrepancy between the role definition and subjects' self-ratings was a more significant predictor of depressive affect at Time 1 among high than low self-conscious individuals. In addition, discrepancy at Time 1 was a significant predictor of depression at Time 2 among high but not low self-conscious individuals. On the other hand, depression at Time 1 was unrelated to discrepancy at Time 2 among high self-conscious subjects. On the basis of these results, it is concluded that high private self-consciousness combined with role-identity discrepancy is associated with increased risk of depression. Finally, additional analyses suggested that depression may itself function to increase subsequent self-consciousness.     

Understanding spatial transformations: similarities and differences between mental rotation and mental folding

Mental rotation and mental folding, two widely used measures of spatial ability, both require the dynamic spatial transformation of objects with respect to their internal spatial structure. Traditionally, however, these two skills have been considered quite distinct, based primarily on factor analyses of psychometric data. This paper reviews the similarities and differences between mental rotation and mental folding from a variety of perspectives, including their definitions, component cognitive processes, neurological bases, developmental trajectories, malleability, predictive validity, and psychometric properties. We conclude that mental rotation and mental folding are similar in many respects. However, the tasks differ in whether they require rigid or non-rigid transformations of objects. In addition, mental rotation shows robust sex-related differences whereas mental folding does not. We also identify specific questions for which research is lacking.     

Rule learning by zebra finches in an artificial grammar learning task: which rule?

A hallmark of the human language faculty is the use of syntactic rules. The natural vocalizations of animals are syntactically simple, but several studies indicate that animals can detect and discriminate more complex structures in acoustic stimuli. However, how they discriminate such structures is often not clear. Using an artificial grammar learning paradigm, zebra finches were tested in a Go/No-go experiment for their ability to distinguish structurally different three-element sound sequences. In Experiment 1, zebra finches learned to discriminate ABA and BAB from ABB, AAB, BBA, and ABB sequences. Tests with probe sounds consisting of four elements suggested that the discrimination was based on attending to the presence or absence of repeated A- and B-elements. One bird generalized the discrimination to a new element type. In Experiment 2, we continued the training by adding four-element songs following a ‘first and last identical versus different’ rule that could not be solved by attending to repetitions. Only two out of five birds learned the overall discrimination. Testing with novel probes demonstrated that discrimination was not based on using the ‘first and last identical’ rule, but on attending to the presence or absence of the individual training stimuli. The two birds differed in the strategies used. Our results thus demonstrate only a limited degree of abstract rule learning but highlight the need for extensive and critical probe testing to examine the rules that animals (and humans) use to solve artificial grammar learning tasks. They also underline that rule learning strategies may differ between individuals.     

Trust in Supervisors and Trust in Customers: Their Independent,Relative, and Joint Effects on Employee Performance and Creativity

We examined the relations for hairstylists between trust and routine and creative performance and the extent to which these service employees trust their supervisors and customers. We also investigated whether psychological safety mediated these trust–performance relations. Results suggested that trust in supervisors and trust in customers made significant, independent, and joint contributions to employees' creative performance; however, only trust in supervisors was related to routine performance. Moreover, psychological safety mediated the trust in supervisor–performance links, but did not mediate the trust in customer influence.