Binocular masking induced by a moving object

Movement in a part of either of two binocular fields can, under some conditions, produce temporary obliteration of the corresponding part of the other field. This paper is a mainly qualitative study of this rather surprising phenomenon. The effect is found to increase from the fovea to the periphery, to be greatest at a velocity of about 20° visual angle per sec. and to vary with the orientation of the fixation point in the visual field. Some further lines of research designed to elucidate the relation of the effect described here to certain other visual phenomena are suggested.     

Children's alcohol cognitions prior to drinking onset: discrepant patterns from implicit and explicit measures

Prior to drinking onset, children report stronger negative versus positive beliefs on self-report alcohol expectancy questionnaires, with some attenuation of this negativity as they transition into adolescence. Traditional alcohol expectancy assessments, however, capture endorsement of deliberative propositions about drinking outcomes. Measurement of implicit alcohol associations may elucidate automatic evaluations, clarifying the role of nondeliberative cognition in the initiation of alcohol use among youth. Few studies have assessed implicit alcohol cognition among children and younger adolescents, with inconsistent findings regarding the nature of these automatic associations within and between age groups. Eighty-nine 3rd and 4th graders and 91 7th and 8th graders completed an alcohol expectancy measure and two unipolar alcohol Implicit Association Tests (IAT) measuring positive and negative alcohol associations independently. On the explicit measure older compared with younger participants rated positive drinking outcomes as more likely and negative outcomes as less likely. Older compared with younger students were also more neutral/moderate in their evaluations of positive drinking outcomes. On the IATs, scores for the full sample indicated negative alcohol associations, and Negative IAT scores were higher for older compared with younger participants. However, the valence of implicit alcohol associations was qualified by the order of explicit versus implicit assessment; for those who completed the IATs prior to the explicit expectancy measure, alcohol associations were positive. Findings replicate and extend prior research conducted with preonset youth. Implications regarding the role of automatic and controlled processes in drinking onset and directions for future work on children's alcohol cognition are discussed.     

A Beta Unfolding Model for Continuous Bounded Responses

An unfolding model for continuous bounded responses is proposed, derived both from a hypothetical interpolation response mechanism and from the hypothesis of two opposite sources of item refusal being collapsed. These two sources of refusal are made explicit in a three-component Dirichlet response model and then collapsed to obtain a (two-component) beta response model. The two natural parameters of the beta are interpreted as acceptance and refusal parameters and expressed as functions of person-item distances on a latent continuum. The potentially bimodal shape of the beta is exploited to model chaotic response choices among ambivalent subjects.     

Academic achievement and behavioral health among Asian American and African American adolescents: testing the model minority and inferior minority assumptions

The present study tested the model minority and inferior minority assumptions by examining the relationship between academic performance and measures of behavioral health in a subsample of 3,008 (22 %) participants in a nationally representative, multicultural sample of 13,601 students in the 2001 Youth Risk Behavioral Survey, comparing Asian Americans (N = 408) and African Americans (N = 2,600). Specifically, the study examined associations of students’ self-reported grades with suicide risk, substance abuse, and violent behaviors. The findings revealed that high academic performance is a protective factor against behavioral health problems for both ethnic groups. The results raise questions about the focus on high achievement among Asian Americans versus academic underachievement among African Americans. Implications for theory, research, training and practice in addressing the mental health implications of achievement behavior in Asian American and African American youth are discussed.     

Cancer as a defence against depressive pain

An association between object loss and the predisposition to develop physical illness is well established in the psychosomatic literature. This paper describes a psychotherapeutic consultation with a woman who developed breast cancer after the death of her father by cancer, and the loss of her mother by dementia. Her cancer was preceded by persecutory dreams which ‘predicted” the cancer, and which ceased when the cancer was diagnosed. It is argued that the cancer represented a somatic defence against intolerable guilt and despair, which constitute depressive anxiety as described by Klein and Riviere. Cancer is felt by such patients to be preferable to grief and madness. Possible unconscious meanings and functions of the dreams and the cancer are discussed, as well as the patient's inability to avail herself of psychotherapeutic help.     

An Analysis of Air-Stepping in Normal Infant Vervet Monkeys

Limb movements during air-stepping were analyzed in three neonatal vervet monkeys over a three-week period. The movements had similar temporal organization both across animals and across time. For example, the duration of both the hind and the forelimb cycle equaled about 500 ms, with the hind limb return strokes lasting much longer than the hind limb power strokes. Furthermore, there were clear indications of both intra- and interlimb coordination. Specifically, all the joints of a limb tended to flex and extend simultaneously, and contralateral and ipsilateral limb pairs had an average phase relationship of approximately 50% of cycle duration. Despite a qualitative similarity between limb movements during air-stepping in the neonates and overground locomotion in older animals, there were notable differences both in temporal relationships and joint displacement patterns. Finally, there appeared to be important similarities between air-stepping in these monkeys and stepping in newborn humans. Most notably, both tended to disappear after a limited period. The implications of these similarities, as well as the overall results, are discussed in relation to the understanding of the development of locomotor behavior in human and nonhuman primates, using approaches based both upon the hard-wired and dynamic models.     

Introduction to special issue on contributions of mathematical psychology to clinical science and assessment

Evolution of clinical mathematical psychology, exemplifying integrative, translational psychological science, is considered in light of target, idealized scientific systems. It is observed that mutual benefits to psychological clinical science, and quantitative theory, potentiated through their interlacing as exemplified in this special issue, stand to parallel the historical symbiosis between older disciplines and mathematics. Enumerated are the range of psychological processes and clinical groups addressed, forms of modeling implemented, and clinical issues engaged, the latter ranging from intervention, to elucidation of deviant basic processes. A denouement comprising cogent quotations from historical figures in science concludes this Introduction.