Category priming with aliens: analysing the influence of targets' prototypicality on the centre surround inhibition mechanism

Marginally perceptible prototypes as primes lead to slowed reactions to related category exemplars as compared to unrelated ones. This at first glance counterintuitive finding has been interpreted as evidence for a particular mechanism of lateral inhibition, namely the centre surround inhibition mechanism. We investigated the semantic surround of category labels by experimentally manipulating the prototypicality of stimuli. Participants first learned two new categories of fantasy creatures in a 5-day-long learning phase before they worked through a semantic priming task with the category prototypes as primes and category exemplars as targets. For high-prototypical targets we observed benefit effects from related primes, whereas for low-prototypical targets we observed cost effects. The results define when the centre surround inhibition mechanism is applied, and furthermore might explain why previous studies with word stimuli (i.e., material that prevents experimental manipulation of prototypicality) observed mixed results concerning the prototypicality of targets.     

Parental Influence on Children with Attention-Deficit/Hyperactivity Disorder: I. Relationships Between Parent Behaviors and Child Peer Status

We examined associations between children’s peer relationships and (a) their parents’ social competence as well as (b) their parents’ behaviors during the children’s peer interactions. Participants were families of 124 children ages 6–10 (68% male), 62 with ADHD and 62 age- and sex-matched comparison youth. Children’s peer relationships were assessed via parent and teacher report, and sociometric nominations in a lab-based playgroup. Parental characteristics were assessed via parent self-report and observations of behavior during their child’s playgroup. After statistical control of relevant covariates, parents of children with ADHD reported poorer social skills of their own, arranged fewer playdates for their children, and displayed more criticism during their child’s peer interaction than did parents of comparison youth. Parents’ socialization with other parents and facilitation of the child’s peer interactions predicted their children having good peer relationships as reported by teachers and peers, whereas parental corrective feedback to the child and praise predicted poor peer relationships. Parents’ ratings of their child’s social skills were positively associated with ratings of their own social skills, but negatively associated with criticism and facilitation of the child’s peer interactions. Relationships between parental behaviors and peer relationships were stronger for youth with ADHD than for comparison youth. The relevance of findings to interventions is discussed.     

Pharmakotherapie der Begleitdepression

Depressive St?rungen geh?ren bei Allgemeinkrankenhauspatienten zu den h?ufigsten psychischen St?rungen. Sie haben oft negative Auswirkungen auf die Prognose und die Behandlung k?rperlicher Erkrankungen. Selbst für den routinierten und erfahrenen Arzt stellt die antidepressive Pharmakotherapie depressiver Patienten mit somatischen Krankheiten oftmals eine besondere Herausforderung dar. In diesem Kontext gilt es in der Regel, unerwünschte Arzneimittelwirkungen bei Komedikation mit anderen Pharmaka – wie zum Beispiel den Wirkverlust eines zuvor in stabilen Erhaltungsdosen verabreichten Medikaments oder ein erh?htes Risiko für die Entwicklung von Arzneimittelnebenwirkungen – zu vermeiden.     

Optimization of Blocked Designs in fMRI Studies

Blocked designs in functional magnetic resonance imaging (fMRI) are useful to localize functional brain areas. A blocked design consists of different blocks of trials of the same stimulus type and is characterized by three factors: the length of blocks, i.e., number of trials per blocks, the ordering of task and rest blocks, and the time between trials within one block. Optimal design theory was applied to find the optimal combination of these three design factors. Furthermore, different error structures were used within a general linear model for the analysis of fMRI data, and the maximin criterion was applied to find designs which are robust against misspecification of model parameters.     

Elevated disgust sensitivity in blood phobia

In order to demonstrate elevated disgust sensitivity and facilitated disgust learning in patients suffering from blood injection injury phobia, 23 phobics and 20 controls underwent an evaluative conditioning experiment. They were presented with picture pairs consisting of affectively neutral pictures (CS), which were followed by either disgust-inducing, fear-inducing, pleasant, or neutral scenes (US). During the presentation we recorded the electromyogram (EMG) of the musculus levator labii as a specific disgust indicator. Affective ratings for the pictures were determined before and after conditioning. Also, CS-US contingency verbalisation (CV) was assessed. Phobics reported a greater overall disgust sensitivity, experienced stronger feelings of disgust, and showed greater EMG responses while viewing disgust-eliciting scenes than control subjects. Evaluative conditioning occurred equally in both groups and depended on CV.     

The role of cognitive appraisal in media-induced presence and emotions

In the present study, we applied Valins’ (1966) bogus bodily feedback paradigm to investigate the roles of cognitive appraisal (tele)presence, and emotion in the context of media usage. Participants (N=30) viewed short sequences of a TV show, whereby false heart rate feedback was provided. In line with Valins’ paradigm, the manipulation we used in this study included two levels: high vs. low false heart rate feedback. We assessed presence, enjoyment, and the real heart rate. Participants reported stronger experiences of presence and enjoyed the clips more when they wrongly believed that they had been aroused. Since bogus feedback increases the sensation of presence, the results indicate that presence—like emotions—can be influenced by cognitive appraisals. It is likely that the false heart rate feedback was attributed to the stimulus, which in turn enhanced the sensation of presence.     

The effects of physical exercise on psychophysiological reactions under stress

Abstract

The effects of moderate physical exercise during a 20-minute anticipation period of a public speech were investigated. Mood before the anticipation period was manipulated as an additional stress factor. As a third experimental factor the subjects were given the opportunity for task preparation or not. Besides cardiovascular variables and self-reports of bodily symptoms, mood reports served as dependent variables and as indicators of general well-being. Eighty female students took part in the study. Moderate exercise was associated with strongly increased activation and reports of related bodily symptoms. The reported mood changes as a function of exercise included a decrease in anxiety and an increase in self-reliance. This mood repair effect of exercise was especially apparent when the subjects entered the anticipation period in a negative emotional state. The exercised subjects spoke with greater calmness. The task preparation during anticipation led to slightly increased activation and to reports of bodily symptoms as well as increased anxiety and less self-reliance. The prepared subjects made fewer pauses in their speeches.     

Evidence for the integration of audiovisual emotional information at the perceptual level of processing

The present aim was to investigate how emotional expressions presented on an unattended channel affect the recognition of the attended emotional expressions. In Experiments 1 and 2, facial and vocal expressions were simultaneously presented as stimulus combinations. The emotions (happiness, anger, or emotional neutrality) expressed by the face and voice were either congruent or incongruent. Subjects were asked to attend either to the visual (Experiment 1) or auditory (Experiment 2) channel and recognise the emotional expression. The result showed that the ignored emotional expressions significantly affected the processing of attended signals as measured by recognition accuracy and response speed. In general, attended signals were recognised more accurately and faster in congruent than in incongruent combinations. In Experiment 3, possibility for a perceptual-level integration was eliminated by presenting the response-relevant and response-irrelevant signals separated in time. In this situation, emotional information presented on the nonattended channel ceased to affect the processing of emotional signals on the attended channel. The present results are interpreted to provide evidence for the view that facial and vocal emotional signals are integrated at the perceptual level of information processing and not at the later response-selection stages.     

Second language learning in elementary and high school students

Abstract

A cross-sectional approach covering an age range of 10 years was used to compare the developmental changu in picture naming md number naming of 77 high scbool md 74 elementary students who came from Germany to Sweden. For the two different groups of students, length of residcoce in Swedcn was the main independent variable and reaction time on simple naming tasks of pictures and numbers in German and Swedish was the dependent variable. The results provide evidence that elementuy school students achieved a balanced form of bilingualism 2 years earlier than high school students on the picture naming task. Naming two-digit numbers was shown to be a relatively difficult task for elementary school children, as indiated by markedly prolonged response times. Despite this fact, after about 4 years of residence in Sweden, both groups of students reached language ballaced on this task in that they showed identical response times in both languages. The results on the picture naming task were taken as support for the optimal age hypothesis.     

Controlled trial of a minimal-intervention exercise program for middle-aged working women

Abstract

Despite potential for major benefits, middle-aged women have low levels of aerobic exercise. A 12-week minimal-intervention exercise program was evaluated with female university employees aged 40 to 61. Following pre-testing, participants were randomly assigned to exercise or wait-list control. Testing was repeated at 12, 24 and 48 weeks. Exercisers improved significantly in aerobic fitness at 12 and 24 weeks, both groups decreased resting arterial pnssurc and body composition measures, and improved in exercise knowledge. Effects, however, were not well maintained at 48 weeks. These results are comparable to those obtained fmm intensive interventions and, while modest, suggest that a threshold has been reached for the modification of physiological control systems which are important for reducing cardiovascular disease risk. Middle-aged women face major social and practical baniers to regular exercise, and the minimal-intervention approach allows for a combination of flexibility and structure which seems appropriate for this group.