Institut für Psychologie
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Many perceptual and cognitive tasks permit or require the integrated cooperation of specialized sensory channels, detectors, or other functionally separate units. In compound detection or discrimination tasks, 1 prominent general mechanism to model the combination of the output of different processing channels is probability summation. The classical example is the binocular summation model of Pirenne (1943), according to which a weak visual stimulus is detected if at least 1 of the 2 eyes detects this stimulus; as we review briefly, exactly the same reasoning is applied in numerous other fields. It is generally accepted that this mechanism necessarily predicts performance based on 2 (or more) channels to be superior to single channel performance, because 2 separate channels provide "2 chances" to succeed with the task. We argue that this reasoning is misleading because it neglects the increased opportunity with 2 channels not just for hits but also for false alarms and that there may well be no redundancy gain at all when performance is measured in terms of receiver operating characteristic curves. We illustrate and support these arguments with a visual detection experiment involving different spatial uncertainty conditions. Our arguments and findings have important implications for all models that, in one way or another, rest on, or incorporate, the notion of probability summation for the analysis of detection tasks, 2-alternative forced-choice tasks, and psychometric functions.
Studies on habitual reading motivation (RM) indicate positive relations between intrinsic RM and text comprehension. Extrinsic RM in contrast is not or negatively correlated with text comprehension. However, it is unknown on which sub-dimensions - in particular of intrinsic RM these relationships are based and whether they apply to the understanding of literary and expository texts equally. Therefore, we examined in a sample of 1500 9th graders whether there are differential relationships between single subdimensions of intrinsic RM (object- vs. experience-related) and extrinsic RM (competition- vs. achievement-related) and comprehension of literary and expository texts. Results indicate that both dimensions of extrinsic RM are negatively (competition-related RM) or not significantly (achievement-related RM) associated with comprehension of literary and expository texts. While object-related RM has equally strong positive effects on both types of text comprehension, experience-related RM is exclusively associated with literary, but not with expository text comprehension.
Capacity-Oriented Behavior Therapy in Mental Disorders Mental disorders come along with the impairment of activities and capacities of daily live. Behavior therapy often uses capacity trainings for improving compensatory behavior, beside symptom reduction as such. This article gives an overview on how behavior therapy techniques can be used to improve compensatory behavior in different capacity domains that were conceptually derived from the International Classification of Functioning, Disability and Health (ICF) and which are often impaired in mental disorders.
Background: The appetite-stimulating hormone ghrelin is a fundamental regulator of human energy metabolism. A series of studies support the notion that long-term appetite and weight regulation may be already programmed in early life and it could be demonstrated that the intrauterine environment affects the ghrelin system of the offspring. Animal studies have also shown that intrauterine programming of orexigenic systems persists even until adolescence/adulthood. Methods: We hypothesized that plasma ghrelin concentrations in adulthood may be associated with the intrauterine exposure to cigarette smoke. We examined this hypothesis in a sample of 19-year-olds followed up since birth in the framework of the Mannheim Study of Children at Risk, an ongoing epidemiological cohort study of the long-term outcome of early risk factors. Results: As a main finding, we found that ghrelin plasma concentrations in young adults who had been exposed to cigarette smoke in utero were significantly higher than in those without prenatal smoke exposure. Moreover, individuals with intrauterine nicotine exposure showed a significantly higher prevalence of own smoking habits and lower educational status compared to those in the group without exposure. Conclusion: Smoking during pregnancy may be considered as an adverse intrauterine influence that may alter the endocrine-metabolic status of the offspring even until early adulthood.