Visual perspective taking for avatars in a Simon task

In modern digital applications, users often interact with virtual representations of themselves or others, called avatars. We examined how these avatars and their perspectives influence stimulus–response compatibility in a Simon task. Participants responded to light/dark blue stimuli with left/right key presses in the presence of a task-irrelevant avatar. Changes in stimulus–response compatibility were used to quantify changes in the mental representation of the task and perspective taking toward this avatar. Experiments 1 and 2 showed that perspective taking for an avatar occurred in orthogonal stimulus–response mappings, causing a compatibility effect from the avatar’s point of view. In the following two experiments we introduced a larger variety of angular disparities between the participant and avatar. In Experiment 3, the Simon effect with lateralized stimulus positions remained largely unaffected by the avatar, pointing toward an absence of perspective taking. In Experiment 4, after avatar hand movements were added in order to strengthen the participants’ sense of agency over the avatar, a spatial compatibility effect from the avatar’s perspective was observed again, and hints of the selective use of perspective taking on a trial-by-trial basis were found. Overall, the results indicate that users can incorporate the perspective of an avatar into their mental representation of a situation, even when this perspective is unnecessary to complete a task, but that certain contextual requirements have to be met.     

A Question of Two Answers: Difference and Determination in Barth and von Balthasar

This essay uses the motif of 'the woman as answer' in Barth and von Balthasar to explore aspects of their accounts of sexual difference in relation to ontological and trinitarian difference. In both cases the motif is shown to be problematic for reasons which become apparent in christology. Barth's characterisation of woman as the 'sufficient answer' to the prior 'question' posed by man indicates a tendency towards the elision of difference in his anthropology, which is reflected in the nonsexuality of Christ - the 'true Man' Ð and in aspects of his trinitarian theology. Von Balthasar's 'double answer' of woman to man moves beyond viewing sexual difference as the locus of man's self-completion, but the overdetermination of 'woman' in his mariology undermines this. The pneumatology of von Balthasar's 'Spiritus Creator' suggests possibilities for the development of a christologically-focused anthropology which maintains difference.     

Quality of Life and Neurological Illness: A Review of the Literature

This article highlights some of the conceptual and methodological problems associated with quality of life (QoL) measurement in individuals with neurological illness. It is suggested that these problems have contributed to the underdeveloped status of QoL research in neurological settings. Many of the existing QoL measures that have been used, or show potential for use with individuals with neurological illness, are reviewed in terms of their theoretical basis, content, and practicality. A large proportion of these measures fail to meet adequate psychometric standards and/or have rarely been psychometrically tested. The confusion that surrounds adequate psychometric standards is discussed, and the dynamic nature of QoL is highlighted as a factor that requires further attention. Research addressing the discrepancies between proxy and patient ratings of patient QoL is also warranted. More focused research in these areas may contribute to a clearer understanding of how to assess QoL in individuals with neurological illness.     

Knowledge level learning and the power law: A soar model of skill acquisition in scheduling

Zusammenfassung. Das hier vorgestellte Modell lernt graduell, Planungsaufgaben aus der Klasse der Maschinenbelegungsprobleme (job-shop-scheduling problems) zu lösen. Mit Hilfe des Chunking-Mechanismus von Soar wird episodisches Wissen über die Belegungsreihenfolge von Aufträgen auf Maschinen memoriert. Bei der Entwicklung des Modells wurden zahlreiche qualitative (z. B. Transfereffekte) und quantitative Befunde (z. B. Bearbeitungszeiten) aus einer früheren empirischen Untersuchung berücksichtigt. In einer Validierungsstudie wurden dieselben Aufgaben von 14 Probanden und dem Modell bearbeitet. Die Passung von Simulationsdaten und empirischen Ergebnissen fiel insgesamt gut aus. Allerdings löst das Modell die Aufgaben schneller und zeigt auch einen etwas besseren Lernverlauf als die Probanden. Das Modell liefert eine Erklärung für das Rauschen, das typischerweise bei Bearbeitungszeiten zu beobachten ist: es handelt sich um erworbenes Wissen, das mehr oder weniger gut und auch unterschiedlich häufig auf neue Situationen übertragen wird. Der Lernverlauf der Probanden entspricht nur für aggregierte Daten einer Potenzfunktion (power law). Der vorgestellte Mechanismus zeigt, wie ein symbolisches Modell der Informationsverarbeitung graduelle Verhaltensänderungen generiert und wie der offensichtliche Erwerb allgemeiner Prozeduren ohne explizites Lernen von deklarativen Regeln erfolgen kann. Es wird nahegelegt, daß es sich hier um die Modellierung einer Form impliziten Lernens handelt. Summary. The model presented here gradually learns how to perform a job-shop scheduling task. It uses Soar's chunking mechanism to acquire episodic memories about the order to schedule jobs. The model was based on many qualitative (e.g., transfer effects) and quantitative (e.g., solution time) regularities found in previously collected data. The model was tested with new data where scheduling tasks were given to the model and to 14 subjects. The model generally fit these data with the restrictions that the model performs the task (in simulated time) faster than the subjects, and its performance improves somewhat more quickly than the subjects' performance. The model provides an explanation of the noise typically found in problem solving times - it is the result of learning actual pieces of knowledge that transfer more or less to new situations but rarely by an average amount. Only when the data are averaged (i.e., over subjects) does the smooth power law appear. This mechanism demonstrates how symbolic models can exhibit a gradual change in behavior and how the apparent acquisition of general procedures can be performed without resorting to explicit declarative rule generation. We suggest that this may represent a type of implicit learning.     

The puzzle of language evolution

Linguistics must again concentrate on the evolutionary nature of language, so that language models are more realistic with respect to human natural languages and have a greater explanatory force. Multi-agent systems are proposed as a possible route to develop such evolutionary models and an example is given of a concrete experiment in the origins and evolution of word-meaning based on a multi-agent approach.     

Therapeutic work with refugees living in exile: Observations on clinical practice

Asylum seekers and refugees fleeing to Britain or other host countries face a range of dilemmas, which are qualitatively different from those facing any other client group. Refugees find themselves in an entirely different country, having often fled at short notice without making preparations. They may have suffered multiple practical and psychological losses. Significant numbers of refugees will have been subject to organised violence in their country of origin. Responding clinically to the needs of some of those becoming refugees has many implications and challenges for existing models of therapeutic intervention. This paper draws upon the author's clinical work in Britain and abroad, it details some observations on therapeutic practice and highlights the challenges and rewards of working with this client group.     

Encouraging counsellor reflection

The evolution of an 'attributes checklist' tool for assisting counsellor development is described. The attributes relate to characteristics of case-notes that indicate evidence of counsellor reflection and consideration of the counselling process. The checklist was initially tested among a sample of 19 counsellors employed by an organisational EAP and was subsequently refined. The final checklist tool was found to be both usable and useful in differentiating 'process' from 'content' notes. The purpose of the checklist tool is not to enable quantitative assessment of counsellor notes, but rather to facilitate counsellor development within a professional supervisory relationship. The findings of the study are discussed, and suggestions for future research in this area are made.     

Alcohol Consumption and the Theory of Planned Behavior: An Examination of the Cognitive Mediation of Past Behaviorid

This study examined the predictive power of the theory of planned behavior (TPB) in explaining alcohol consumption in 3 prospective samples of students ( Ns = 178. 176. and 159). Generally, the TPB performed well. with attitudes, subjective norms and perceived behavioral control (PBC) explaining between 28% and 46% of the variability in intentions. Intentions and PBC explained between 12% and 50% of the variability in behavior. Measures of self-identity as a "drinker" and past behavior contributed to predictions of intentions over and above the contribution of attitudes. subjective norms. and PBC. Measures of past behavior but not self-identity consistently contributed to predictions of behavior over and above the contributions from intentions and PBC. The direct relationship between past behavior and intention and between past behavior and behavior (independent of the TPB variables or self-identity) could not be attributed to common method variance.