Ambiguous figures: living versus nonliving objects

Eleven series of figures were studied, each series ranging from one extreme interpretation via five ambiguous intermediates to a second extreme interpretation. Triplets consisting of an ambiguous exemplar in the middle flanked on the left and right by its two extreme interpretations were presented to large groups of subjects. The initial aim was to establish the levels of perceptual ambiguity of each exemplar in a series, and normative data on the ambiguous figures are provided for future reference and use. However, several biases were encountered and these were examined in more detail. In experiment 1 the subject's task was to compare the middle figure with the flankers and draw an arrow from the middle figure towards the flanking extreme they judged the most similar. Here, an overall preference for the left extreme was found. Therefore the instructions were reversed in experiment 2; flankers had to be compared with the middle figure. The preference for the left extreme remained for figures of living objects, but for nonliving objects the preference switched to the right extreme. To do away with any effect of the arrows, in experiment 3 subjects were divided into two groups each receiving different instructions and were asked to circle one of the extremes. However, the pattern of biases remained the same. The bias found with figures of living objects may be explained on the basis of top-down processes. For nonliving figures, an hypothesis based on bottom-up processes like neural fatigue was considered but rejected.     

On the inhomogeneity of a test compounded of two Rasch homogeneous subscales

Van den Wollenberg stated a theorem specifying the conditions for a test, which is composed of two Rasch homogeneous subscales, as also behaving Rasch homogeneously. In our note, simple numerical counterexamples are given for which this theorem fails.While preparing the final version of this note, Ilse Rop passed away. The first author therefore takes sole responsibility for this final version.     

The development of a simple form of communication

This paper is concerned with situations in which one of two possible stimuli is presented to one subject, the sender, while a second subject is required to make one of two responses. The stimuli are not available to the receiver, but the latter can perceive the sender. Successful performance depends on the sender indicating what stimulus is present to the receiver. It is proposed that the development of this form of communication, initially observed with dolphins, can be understood in the light of recent autoshaping research. An experiment demonstrated that pairs of pigeons can learn to perform appropriately in such a situation and provided evidence supporting an autoshaping analysis.     

Freiwilligkeit oder Zwang

Within Quasi-Compulsory Treatment (QCT) measures for drug dependent offenders, a variety of treatment measures is offered in place of punishment. The present study examines if coerced clients differ from voluntary clients regarding drug history, criminal behaviour, psychological and medical problems as well as their treatment motivation. The data of the present study have been collected in six different treatment institutions in Austria within the framework of the European research project ?QCT-Europe“. A total of 150 clients, who began treatment either ‘voluntarily’ or as a QCT-measure, has been interviewed using standardized questionnaires. The comparison between ‘voluntary’ and QCT-clients suggests that ‘voluntary’ clients seem to suffer more from medical problems and also show more hazardous drug use behaviour.     

Motor-Skill Learning in Alzheimer’s Disease: A Review with an Eye to the Clinical Practice

Since elderly people suffering from dementia want to go on living independently for as long as possible, they need to be able to maintain familiar and learn new practical skills. Although explicit or declarative learning methods are mostly used to train new skills, it is hypothesized that implicit or procedural techniques may be more effective in this population. The present review discusses 23 experimental studies on implicit motor-skill learning in patients with Alzheimer’s disease (AD). All studies found intact implicit motor-learning capacities. Subsequently, it is elaborated how these intact learning abilities can be exploited in the patients’ rehabilitation with respect to the variables ‘practice’ and ‘feedback.’ Recommendations for future research are provided, and it is concluded that if training programs are adjusted to specific needs and abilities, older people with AD are well able to (re)learn practical motor skills, which may enhance their autonomy.     

Social relationships and social support among post‐war youth in Northern Uganda

Although social relationships and social support are salient factors for post‐war adolescents' psychosocial coping and adjustment, there is only limited information regarding war‐affected adolescents' views on social support and the relationships within which social support is provided. This study therefore explored both elements among a clinical sample of 20 adolescents living in post‐war Northern Uganda. Following Braun and Clarke's thematic analysis, we found a prominent role of the biological mother and other primary biological family members in the upbringing of our participants. Spiritual and material support were perceived to be the most important type of support, respectively, while the adolescents were growing up and in their current lives. These findings provide support for the perception that caregiving systems are adaptable to particular sociocultural contexts. Further, the importance of particular functions of social support could signify a potentially selective buffering effect of these functions in adverse contexts. Because of the importance of the primary biological family and the salient role of parent–child relationships in the face of adversity, future research needs to focus on this particular kind of social relationship in contexts of prolonged collective violence.     

Eighteen‐month‐old infants show distinct electrophysiological responses to their own faces

Infants attain the developmental milestone of self‐recognition around 18 to 24 months of age. At 18 months of age, half of the infant population typically shows signs of self‐recognition in the classic mirror test. The current study examined the functional neural correlates of the perception of self in infancy. Eighteen‐month‐old infants observed photographs of their own face, the face of an unfamiliar infant, the face of their caregiver, and the face of an unfamiliar caregiver, while their EEG was registered. The results show that infants show an enhanced response to their own face compared to other faces. The N290, an established face‐selective ERP component in infants, was larger for observation of their own face compared to others’ faces. In addition to the EEG task, the mirror test was administered. Half of the infants in our sample recognized themselves in the mirror. However, there were no differences in the ERP responses between the infants who did and did not recognize themselves in the mirror. This suggests that a distinction between the neural response to self and to others does not necessarily express itself in self‐recognition behavior.     

The effects of age-of-acquisition and frequency-of-occurrence in visual word recognition: Further evidence from the Dutch language

It has been claimed that the frequency effect in visual word naming is an artefact of age-of-acquisition: Words are named faster not because they are encountered more often in texts, but because they have been acquired earlier. In a series of experiments using immediate naming, lexical decision, and masked priming, we found that frequency had a clear effect in lexical tasks when age-of-acquisition is controlled for. At the same time, age-of-acquisition was a significant variable in all tasks, whereas imageability had no effect. These results corroborate findings previously reported in English and Dutch.     

Die Weisen des Gegebenseins im Traum

Ohne Zusammenfassung