Cognitive control of rotation in depth

Abstract

Five experiments examined the ability of observers to control the direction of rotation of parallel (Experiments 1–4) and polar (Experiment 5) projections of transparent objects using a control strategy based on the idea that attended surfaces are given front/convex default interpretations. Experiments 1 and 2 measured observers' degree of control and evaluated the role of attention in the control strategy. Experiment 3 examined whether attentional constraints limit the use of the strategy with dual rotating objects. Experiment 4 measured control with unambiguous stimuli in which the direction of rotation was specified by occlusion or proximity luminance covariance, and Experiment 5 measured the control of structure (rigid, non-rigid) as well as motion by examining the control of rotating displays presented in polar perspective. The General Discussion evaluates several hypotheses concerning the nature and rationale of an attentional bias in surface interpretation.     

Older adults’ associative deficit in episodic memory: Assessing the role of decline in attentional resources

In this study, we evaluated an associative deficit hypothesis. This hypothesis suggests that the deficit seen in the episodic memory performance of older adults is due, in considerable part, to older adults’ difficulty in binding together unrelated components of an episode into a cohesive entity (Naveh-Benjamin, 2000). The study extended the conditions under which older adults show a differential deficit in tests requiring associations among the episode components to situations in which the item and the associative recognition tests are equated on the response mode used and on the amount of information displayed. In addition, we tested the potential role of a decrease in attentional resources in the associative deficit of older adults by comparing their performance to that of younger adults under conditions of reduced attentional resources. The results of the study, which indicate that younger adults under divided attention do not show an associative deficit, are interpreted as indicating that the associative deficit of older adults is due to factors other than depleted attentional resources.     

Comparison of optimal cutoff points for single and multiple tests in personnel selection

This paper compares the determination of optimal cutoff points for single and multiple tests in the field of personnel selection. Decisional skills of predictor tests composing the multiple test are assumed to be endogenous variables that depend on the cutting points to be set. It is shown how the predictor cutoffs and the collective decision rule are determined dependently by maximizing the multiple test's common expected utility. Our main result specifies the condition that determines the relationship between the optimal cutoff points for single and multiple tests, given the number of predictor tests, the collective decision rule (aggregation procedure of predictor tests' recommendations) and the function relating the tests' decisional skills to the predictor cutoff points. The proposed dichotomous decision-making method is illustrated by an empirical example of selecting trainees by means of the Assessment Center method.     

Schizophrenia risk and paternal age: a potential role for de novo mutations in schizophrenia vulnerability genes

How schizophrenia (SZ) is maintained at roughly 1% of the population despite diminished reproduction is one puzzle currently facing researchers. De novo mutations were first proposed over half a century ago as a source for new SZ genes. Current evidence linking advancing paternal age to SZ risk makes revisiting this hypothesis important. Advancing paternal age is the major source of new mutations in the human population. This article will examine potential mechanisms whereby parental age may impact new mutations, as well as review recent data supporting such a hypothesis.     

Acculturation models of immigrant Soviet adolescents in Israel

This study probed acculturation in Israel of immigrant students from the former U.S.S.R. from the perception of the host society and the students. The finding from a questionnaire distributed to Israeli-born and immigrant students indicated that most but not all of the Israel-born students applied an assimilatory model while the immigrants were split between those who accepted the Israeli students and those who resisted them. Thus, ethnic relation typologies and critical sociology of education concepts can explain only part of the immigrants' attitudes. It was found that both the host society and the immigrants have different attitudes toward the culture of the other, and thus use different acculturation strategies.     

Attentional Modulation of Size Contrast

A test circle surrounded by smaller context circles appears larger if presented in isolation, whereas a test circle surrounded by large context circles is seen as smaller than in isolation. Two experiments are reported indicating that this phenomenon, the Ebbinghaus illusion, depends on whether subjects are attending to the context circles. Subjects first saw a reference circle and then a briefly presented (150 msec) test circle. Their task was to determine whether the test circle was larger or smaller than the reference. The test circle was surrounded by smaller context circles of one colour arrayed along a horizontal axis centred on the test, and larger context circles of a different colour arrayed along a vertical axis centred on the test. Subjects judged both the size of the test and the colours of either the small or large context circles. Perceived test size changed systematically, depending on which context circles were task-relevant.     

Illness perceptions or recurrence risk perceptions: What comes first? A longitudinal cross-lagged examination among cardiac patients

Objectives: Previous research suggested that illness perceptions provide the basis for illness risk perceptions through an inductive reasoning process. This study aimed to assess the direction of relationships between illness and recurrence risk perceptions over time, among cardiac patients.

Design: A longitudinal study was conducted among 138 patients undergoing coronary angioplasty. Self-report questionnaires measured perceived recurrence risk and illness perceptions one day and one month after catheterisation.

Results: Cross-lagged Panel Model Analyses revealed that higher perceptions of timeline, consequences and emotional representations of illness at hospitalisation were associated with higher recurrence risk perceptions one month later. Perceived personal control was the only illness perception with bi-directional associations: higher perceived personal control at hospitalisation was associated with higher recurrence risk perceptions one month later; and higher recurrence risk perceptions at hospitalisation was associated with lower personal control one month later.

Conclusions: The findings suggest that the associations between recurrence risk and illness perceptions can only partly be explained by inductive reasoning. Halo effects and defensive processes are suggested as complementary explanations for the observed associations between risk and illness perceptions.     

One team must win,the other need only not lose: an experimental study of an asymmetric participation game

We studied asymmetric competition between two (three‐person) groups. Each group member received an initial endowment and had to decide whether or not to contribute it. The group with more contributions won the competition and each of its members received a reward. The members of the losing group received nothing. The asymmetry was created by randomly and publicly selecting one group beforehand to be the winning group in the case of a tie. A theoretical analysis of this asymmetric game generates two qualitatively different solutions, one in which members of the group that wins in the case of a tie are somewhat more likely to contribute than members of the group that loses, and another in which members of the group that loses in the case of a tie are much more likely to contribute than members of the group that wins. The experimental results are clearly in line with the first solution. Copyright © 2005 John Wiley & Sons, Ltd.