A neurobiological theory of automaticity in perceptual categorization

A biologically detailed computational model is described of how categorization judgments become automatic in tasks that depend on procedural learning. The model assumes 2 neural pathways from sensory association cortex to the premotor area that mediates response selection. A longer and slower path projects to the premotor area via the striatum, globus pallidus, and thalamus. A faster, purely cortical path projects directly to the premotor area. The model assumes that the subcortical path has greater neural plasticity because of a dopamine-mediated learning signal from the substantia nigra. In contrast, the cortical-cortical path learns more slowly via (dopamine independent) Hebbian learning. Because of its greater plasticity, early performance is dominated by the subcortical path, but the development of automaticity is characterized by a transfer of control to the faster cortical-cortical projection. The model, called SPEED (Subcortical Pathways Enable Expertise Development), includes differential equations that describe activation in the relevant brain areas and difference equations that describe the 2- and 3-factor learning. A variety of simulations are described, showing that the model accounts for some classic single-cell recording and behavioral results.     

Intervention Styles With Suicidal Callers at Two Suicide Prevention Centers

Callers to suicide prevention centers are mainly helped by volunteers trained to face these crisis situations. This study evaluated this process of intervention in order to better understand the nature of the interventions and their determinants. A total of 617 calls with suicidal clients were classified with a 20-category rating instrument, the Helper's Response List. Cluster analysis determined that the 617 intervention profiles could match one of two styles: nondirective (“Rogerian”-391 calls) or directive (226 calls). Further analyses indicated that the particular style of intervention was related more to the characteristics of the callers themselves than to characteristics of volunteers.     

Work plan availability and performance: An assessment of task strategy priming on subsequent task completion

The relation of task strategy planning to task performance was explored using a series of laboratory investigations. The first study examined the influence of providing a subject a work strategy and a specific work goal on his or her subsequent performance. A total of 72 subjects participated in a 2 (goal) × 2 (task strategy priming) × 3 (performance period) × 3 (task type) repeated measures, factorial design study. The results demonstrate that task strategy priming and goal setting increase the amount of an individual's planning and directs the type of plan developed. A second study was conducted (n = 90) to further explore the effect of task strategy priming on planning and performance. Taken together, the results of the studies demonstrate that (a) goal setting increases strategic planning, (b) priming influences the amount and type of planning engaged in by an individual, and (c) task performance varies as the result of the type of plan an individual develops. The results are discussed as a means of expanding the use of cognitive constructs in theories of work motivation.     

A case of collective responsibility: who else was to blame for the Columbine high school shootings?

Two studies examined perceptions of collective responsibility for the April 20, 1999, shootings at Columbine High School in Littleton, Colorado. Collective responsibility refers to the perception that others, besides the wrongdoers themselves, are responsible for the event. In Study 1, the authors assessed perceptions of the shooters' parents and their peer group (the Trenchcoat Mafia), whereas Study 2 tested perceptions of collective responsibility across a range of groups. In both studies, perceptions of a target group's entitativity predicted judgments of collective responsibility. This relationship was mediated by two situational construals that justify applying collective responsibility: responsibility by commission (encouraging or facilitating the event) and responsibility by omission (failing to prevent the event). Study 2 also determined that perceptions of authority predicted judgments of collective responsibility for the Columbine shootings and was mediated by inferences of omission. Future directions in collective responsibility research are discussed.     

Prävention chronischer Krankheiten und Gesundheitsförderung

Zusammenfassung In den vergangenen 50 Jahren konnten große Fortschritte in der Entwicklung und der Umsetzung des verhaltensmedizinischen Wissens über die Gesundheit von Individuen und Populationen erzielt werden. Allerdings kamen Gesundheitsförderung und Krankheitsprävention nicht allen Bevölkerungsschichten in und zwischen den einzelnen Ländern in gleichem Maße zugute. Die Ungleichheit der sozialen, psychischen und körperlichen Gesundheit zwischen den wohlhabendsten und ärmsten Bevölkerungsgruppen ist im Wesentlichen gleichgeblieben oder sogar gewachsen. Das Wissen darüber, wie solche Unterschiede in der Gesundheit entstehen, ist allerdings erst dann von Bedeutung, wenn es dazu verwendet wird, geeignete, langfristige und nachhaltige Präventionsstrategien auf mehreren Ebenen zu erarbeiten. Bei solchen Strategien spielen verschiedene Aspekte der globalen natürlichen ökologischen Umwelt und das Streben nach einer sog. gesundheitserhaltenden Umwelt eine wichtige Rolle. Mit dem wachsenden Einfluss der Globalisierung auf die Gesundheit stellt sich die Frage, welche Folgen jenseits der traditionellen nationalen Grenzen für die Krankheitsprävention und für die Gesundheitsförderung zu erwarten sind. Sie sollte uns anregen, darüber nachzudenken, dass die Verbreitung von wirksamen Interventionen auf institutioneller oder politischer Ebene nicht nur innerhalb eines Landes, sondern auch zwischen verschiedenen Ländern von höchster Wichtigkeit ist. In Anbetracht der global und schnell voranschreitenden ökonomischen und sozialen Veränderungen und des gewaltigen Einflusses von globalen Umweltveränderungen auf die Gesundheit müssen die Bandbreite und die Praxis der Verhaltensmedizin erweitert werden.Aus dem Englischen übersetzt von Dipl.-Psych. Erika Nemény, Berlin und Prof. Dr. Ulrike Ehlert, Zürich     

Barking up the wrong tree? Industry funding of academic research. A case study with commentaries

This case raises ethical issues involving conflicts of interest arising from industrial funding of academic research; ethical responsibilities of laboratories to funding agencies; ethical responsibilities in the management of a research lab; ethical considerations in appropriate research design; communication in a research group; communication between advisor and graduate student; responsibilities of researchers for the environment; misrepresentation or withholding of scientific results.     

Continuous attention: rationale and discriminant validation of a test designed for use in psychopharmacology

The continuous attention task (CAT) is a test designed to assess changes in attention due to a variety of factors, for example, drugs. Subjects view a series of 3x3 patterns of squares on a monitor screen, each displayed for 100 msec at intervals of 1.5–2.5 sec, and respond whenever two successive patterns are identical. For such a measure to be validr factors other than attention should be investigated, and shown not to be a factor in performance. Nineteen subjects took part in a study in which information-processing rate and recall of CAT figures was measured. The results showed that a viewing time of 50–60 msec was sufficient for 50% correct recognition of CAT figures, and that recognition with a masked presentation of 100 msec did not differ significantly from an unmaske presentation of 100 msec. Mean recall of CAT figures 2 sec after a 100-msec exposure was 98.2%. These results suggest that performance on the CAT is not limited by either information-processing speed or memory capacity, but is a valid measure of the ability to sustain attention.