Does evaluative learning rely on the perception of contingency?: manipulating contingency and US density during evaluative conditioning

An experiment is reported studying the impact of objective contingency and contingency judgments on cross-modal evaluative conditioning (EC). Both contingency judgments and evaluative responses were measured after a contingency learning task in which previously neutral sounds served as either weak or strong predictors of affective pictures. Experimental manipulations of contingency and US density were shown to affect contingency judgments. Stronger contingencies were perceived with high contingency and with low US density. The contingency learning task also produced a reliable EC effect. The magnitude of this effect was influenced by an interaction of statistical contingency and US density. Furthermore, the magnitude of EC was correlated with the subjective contingency judgments. Taken together, the results imply that propositional knowledge about the CS-US relationship, as reflected in contingency judgments, moderates evaluative learning. The data are discussed with respect to different accounts of EC.     

Can you see me in the snow? Action simulation aids the detection of visually degraded human motion

Using a novel paradigm, we demonstrate that action simulation can directly facilitate ongoing perception of people's movements. Point-light actors (PLAs) representing common human motions were shown embedded in a visual noise reminiscent of "TV snow". At first, the PLAs were perceived clearly, then occluded from view for a short duration, during which it was hypothesized that a real-time action simulation was generated tracking the motion's course. The PLA then reappeared in motion at variable visibility against the noise, whilst detection thresholds for the reappearance were measured. In the crucial manipulation, the test motion was either temporally congruent with the motion as it would have continued during occlusion, and thus temporally matching the simulation, or temporally incongruent. Detection thresholds were lower for congruent than for incongruent reappearing motions, suggesting that reappearing motion that temporally matched the internal action simulation was more likely to be detected.     

Disentangling the adult attention-deficit hyperactivity disorder endophenotype: parametric measurement of attention

Attention deficit hyperactivity disorder (ADHD) persists frequently into adulthood. The decomposition of endophenotypes by means of experimental neuro-cognitive assessment has the potential to improve diagnostic assessment, evaluation of treatment response, and disentanglement of genetic and environmental influences. We assessed four parameters of attentional capacity and selectivity derived from simple psychophysical tasks (verbal report of briefly presented letter displays) and based on a "theory of visual attention." These parameters are mathematically independent, quantitative measures, and previous studies have shown that they are highly sensitive for subtle attention deficits. Potential reductions of attentional capacity, that is, of perceptual processing speed and working memory storage capacity, were assessed with a whole report paradigm. Furthermore, possible pathologies of attentional selectivity, that is, selection of task-relevant information and bias in the spatial distribution of attention, were measured with a partial report paradigm. A group of 30 unmedicated adult ADHD patients and a group of 30 demographically matched healthy controls were tested. ADHD patients showed significant reductions of working memory storage capacity of a moderate to large effect size. Perceptual processing speed, task-based, and spatial selection were unaffected. The results imply a working memory deficit as an important source of behavioral impairments. The theory of visual attention parameter working memory storage capacity might constitute a quantifiable and testable endophenotype of ADHD.     

Berufliche Leistungsfähigkeit

In different fields of law the assessment of capability of performance is important and often poses a particular challenge for medical or psychological experts. The present article introduces a model for the assessment of capability of performance developed on the background of a multicenter and interdisciplinary research project. This approach of assessment assumes that the performance capability of a person with psychiatric or psychosomatic disorders does not arise from symptomatology alone; instead, it is also a consequence of interactions between coping processes of the individual and environmental factors. The presented model of the assessment of performance capability is mainly oriented to the “International Classification of Functioning” (ICF; WHO) whose central diagnostic categories are, in addition to the disorder and the somatic and psychiatric functions, the levels of activity and participation. The different assessing levels are operationalized in the assessment model. In this article the various diagnostic levels and their interactions and the criteria which have been formulated are described. The process of decision-making is explored as well. This assessment model aims to make a more reliable, valid and transparent process of expert decision-making in order to increase the objectivity and justice of the assessment procedure.     

Activation of the infralimbic cortex in a fear context enhances extinction learning

Activation of the infralimbic region (IL) of the medial prefrontal cortex (mPFC) reduces conditioned fear in a variety of situations, and the IL is thought to play an important role in the extinction of conditioned fear. Here we report a series of experiments using contextual fear conditioning in which the IL is activated with the GABAa antagonist picrotoxin (Ptx) during a single extinction session in the fear context. We investigate the impact of this manipulation on subsequent extinction sessions in which Ptx is no longer present. First, we demonstrate that a single treatment with intra-IL Ptx administered in a conditioned fear context greatly accelerates the rate of extinction on the following days. Importantly, IL-Ptx also enhances extinction to a different fear context than the one in which IL-Ptx was administered. Thus, IL-Ptx primes extinction learning regardless of the fear context in which the IL was initially activated. Second, activation of the IL must occur in conjunction with a fear context in order to enhance extinction; the extinction enhancing effect is not observable if IL-Ptx is administered in a neutral context. Finally, this extinction enhancing effect is specific to the IL for it does not occur if Ptx is injected into the prelimbic region (PL) of the mPFC. The results indicate a novel persisting control of fear induced by activation of the IL and suggest that IL activation induces changes in extinction-related circuitry that prime extinction learning.     

Essentialist theory of ‘hybrids’: From animal kinds to ethnic categories and race

This article presents a theory of the perception of hybrids, resulting from cross‐breeding natural animals that pertain to different species and of children parented by couples with a mixed ethnic or racial background. The theory states that natural living beings, including humans, are perceived as possessing a deeply ingrained characteristic that is called ‘essence’ or ‘blood’ or ‘genes’ in everyday discourse and that uniquely determines their category membership. If, by whatever means, the genes or essences of two animals of different species are combined in a hybrid, the two incompatible essences collapse, leaving the hybrid in a state of non‐identity and non‐belonging. People despise this state and reject the hybrid (Study 1). This devaluation effect holds with cross‐kind hybrids and with hybrids that arise from genetically combining animals from incompatible habitats across three cultures: Austria, India and Japan (Study 2). In the social world, groups and ethnic or racial categories frequently are essentialized in an analogue way. When people with an essentialist mindset judge ethnically or racially mixed offspring, they perceive a collapse of ethnic or racial essence and, consequently, denigrate these children, as compared to children from ‘pure’ in‐group or out‐group parents (Study 3). The findings are discussed in terms of the widespread ‘yuck factor’ against genetically modified animals, in terms of the cultural concepts of monstrosity and of racism and prejudice.     

Learning of magnetic compass directions in pigeons

A proof of magnetic compass learning by pigeons under laboratory conditions has been attempted for decades, but all experiments have failed so far. The aim of the present study was to test whether pigeons can learn magnetic compass directions in an operant chamber if magnetic cues are presented as true spatial cues. Experimental sessions were carried out in the local geomagnetic field and in magnetic fields with matched total intensity and inclination, but different directions generated with Helmholtz-coils. Birds demonstrated successful learning with a performance level comparable to that in learning studies with magnetic anomalies. In addition, we compared the data from magnetic learning in the laboratory with performance from homing experiments in the field. The birds that were more successful in the learning experiment had vanishing bearings farther away from the home direction than the group mean at unfamiliar, but not at familiar sites. This might suggest that better learners explore unknown locations in a different way. Our findings represent the first evidence for operant magnetic compass learning in pigeons and also provide a link between behavioural data from the field and the laboratory.     

The information content of panoramic images II: view-based navigation in nonrectangular experimental arenas

Two recent studies testing navigation of rats in swimming pools have posed problems for any account of the use of purely geometric properties of space in navigation (M. Graham, M. A. Good, A. McGregor, & J. M. Pearce, 2006; J. M. Pearce, M. A. Good, P. M. Jones, & A. McGregor, 2004). The authors simulated 1 experiment from each study in a virtual reality environment to test whether experimental results could be explained by view-based navigation. The authors recorded a reference image at the target location and then determined global panoramic image differences between this image and images taken at regularly spaced locations throughout the arena. A formal model, in which an agent attempts to minimize image differences between the reference image and current views, generated trajectories that could be compared with the search performance of rats. For both experiments, this model mimics many aspects of rat behavior. View-based navigation provides a sufficient and parsimonious explanation for a range of navigational behaviors of rats under these experimental conditions.     

Was ist seit BGHSt 45, 164 geschehen? Ein Überblick über die neuere Rechtsprechung des Bundesgerichtshofs zur Beurteilung der Glaubhaftigkeit von Zeugenaussagen

Zusammenfassung  Der 1. Strafsenat des Bundesgerichtshofs hat in seinem Urteil vom 30. Juli 1999 (BGHSt 45, 164) die wissenschaftlichen Anforderungen beschrieben, die an eine aussagepsychologische Begutachtung (Glaubhaftigkeitsgutachten) zu stellen sind, und die Richter verpflichtet, zukünftig darauf zu achten, dass diese Mindeststandards bei der Erstattung von Gutachten eingehalten werden. Ausgehend von dieser Entscheidung stellt der Beitrag die seitherige Entwicklung der Rechtsprechung zur Glaubhaftigkeitsbeurteilung von Zeugenaussagen dar. Er geht dabei über die an das Gutachten zu stellenden Anforderungen hinaus und befasst sich auch damit, wann ein solches Gutachten erforderlich, von wem es zu erstatten und in welcher Weise es vom Richter in den Entscheidungsgründen darzustellen ist. Zudem schildert er, welchen Einfluss die Anerkennung der hypothesengeleiteten, kriterienorientierten Aussageanalyse auf die Beweiswürdigung durch den Tatrichter und deren überprüfung durch das Revisionsgericht hat.

Kriminologische Verlaufsforschung zu Jugendkriminalität

This paper presents a short overview of the developmental research of antisocial behavior in adolescence and young adulthood. We first discuss offending patterns based on official and self-reported data and their limitations and problems. Secondly, we discuss the idea of the ubiquity of juvenile delinquency and the frequent occurrence of desistance in the transition to adulthood. The cessation of criminal activities is also found by so called ?chronic juvenile offenders“. We than discuss two important developmental theories of crime: the taxonomic theory of Moffitt and the age-graded informal social control theory of Sampson and Laub. Based on the qualitative desistance study of serious young offenders, Stelly and Thomas not only demonstrate the different pathways out of crime, the results also demonstrate the limitation of the available theories.