Knowledge alters visual contrast sensitivity

Research has shown that the visual system’s sensitivity to variations in luminance (visual contrast) within a particular area of the retina is affected in a bottom-up fashion by the ambient contrast levels in nearby regions. Specifically, changes in the ambient contrast in areas surrounding the target area alter the sensitivity to visual contrast within the target area. More recent research has shown that paying attention to the target or target area modulates contrast sensitivity, suggesting a top-down influence over contrast sensitivity that is mediated by attention. Here we report another form of top-down influence over contrast sensitivity that is unlikely to be mediated by attention. In particular, we show that knowledge and/or expectations about the levels of visual contrast that may appear in upcoming targets also affect how sensitive the observer is to the contrast in the target. This sort of knowledge-driven, top-down contrast sensitivity control could be used to preset the visual system’s contrast sensitivity to maximize discriminability and to protect contrast-sensitive processes from a contrast overload. Overall, our results suggest that existing models of contrast sensitivity might benefit from the inclusion of top-down control mechanisms.     

Diagnostic Discrimination of Patients with Different OCD Main Symptom Domains from each Other and from Anxious and Depressive Controls

The extent to which the subscales of multidimensional OCD measures accurately distinguish patients with specific OCD main symptom domains from controls at different cutscores has not yet been examined. Diagnostic accuracy of OCD measures usually is determined by comparing the total scores of heterogeneous OCD samples and controls and therefore may underestimate the measures’ discrimination potential. In the current study, subtype-specific diagnostic accuracy and criterion-related validity of the Obsessive-Compulsive Inventory-Revised (OCI-R) subscales were examined in 327 patients with OCD, anxiety, and/or depressive disorders. All subscales demonstrated good to excellent criterion-related validity and diagnostic accuracy for distinguishing patients with specific OCD main symptom domains from controls. As expected, the single OCI-R subscales lead to more accurate diagnostic decisions than the total scale. Thus, the subscale-specific cutscores significantly improve the OCI-R’s utility for subtype-specific treatment planning and outcome measurement. Furthermore, an alternative classification algorithm distinguishing patients with OCD from controls based on subscale cutscores leads to a better sensitivity, but also to a lower specificity than discrimination based on the total scale cutscore.     

The Biobehavioral Model of Persuasion: Generating Challenge Appraisals to Promote Health1

By borrowing from the biopsychosocial model of challenge and threat, we may understand when health communications adequately motivate behavior change or when they are overly distressing and inhibit behavior change. The present studies were guided by the biobehavioral model of persuasion, which predicts that different health appeals should evoke different appraisals, as well as psychological and physiological responses that motivate the adoption or rejection of health behaviors. Challenging messages should be associated with approach motivational tendencies, whereas threatening messages should be linked to avoidance. Findings from 2 experiments support the biobehavioral model of persuasion and offer mechanisms that confer message effectiveness. By understanding the psychological and physiological processes that drive message effectiveness, message designers can create more effective health appeals.     

Operant generalization of auditory tempo in quail neonates

Operant generalization, a building block of cognition, has never been studied in neonates. We developed a preparation for newly hatched quail in order to investigate the form of the generalization gradient very early in development. For their first 4–5 days after hatching, northern bobwhite chicks pecked for brief heat presentations while hearing a high-pitched sound repeated at a constant rate (nondifferential training). Tempo generalization was then assessed in extinction. A significantly excitatory average gradient resulted despite minimal postnatal experience.     

Therapie des chronisch-komplexen Tinnitus

Tinnitus ist ein Ph?nomen, welches für fast jeden Menschen physiologisch unter ruhigen Umgebungsbedingungen subjektiv wahrnehmbar wird. Im psychosomatisch-psychotherapeutischen Setting ist dieses Symptom in der Regel im Rahmen einer Somatisierungsst?rung (F45.0; F45.1) oder des chronisch-komplexen Tinnitus (F54.0, H93.1) anzutreffen. In der vorliegenden Arbeit wird ein integrativer HNO-?rztlicher und psychosomatischer Therapieansatz vorgestellt: Ziel der Behandlung ist es, die Komponenten der akustischen Wahrnehmung zu reorganisieren, das Ohrger?usch und die psychisch emotionale Wertung zu entkoppeln sowie dessen psychologische Bedeutung zu ?ndern. Weiters wird ein Modell vorgestellt, wie die Depression – als h?ufigste komorbide Achse-I-St?rung – in das diagnostisch- therapeutische Erkl?rungsmodell integriert werden kann. Zuletzt werden M?glichkeiten er?rtert, wie Patienten mit chronisch-komplexem Tinnitus zur Aufnahme einer psychotherapeutischen Behandlung motiviert werden k?nnen.     

Erinnerungen an Hannes

Dein Tod hat eine Leere hinterlassen, die schwer zu füllen sein wird. Seltsamerweise ist kein Schmerz in mir, nur ein dankbares Erinnern an fünf Jahre, die ich für dich da war, für dich da sein durfte. T?glich bin ich um die Mittagszeit zu dir gefahren, um dich zu füttern, dir ein wenig Gesellschaft zu leisten, dein unweigerliches Versinken in deine eigene Welt, wenn schon nicht aufzuhalten, denn das war unm?glich, so doch zumindest ein wenig hinauszuz?gern.     

A Multi‐Source,Multi‐Study Investigation of Job Performance Prediction by Political Skill

Political skill is a social effectiveness construct with a demonstrated capacity to predict job performance. However, because performance prediction research in this area to date has made exclusive use of self‐reports of political skill, and due to frequent distrust of self‐ratings of constructs in important personnel decisions, there is a need to investigate how multiple alternative sources of political skill and job performance measures relate, thus raising both theoretical and methodological issues. In three studies, employing a triadic data collection methodology, and utilising both cross‐sectional and longitudinal designs, this research tested the hypotheses that employee political skill, measured from the perspective of employees' assessor A, will positively predict job performance rated by assessor B (i.e. Hypothesis 1a), and vice versa, that employee political skill measured by assessor B will predict job performance ratings measured by assessor A (i.e. Hypothesis 1b).