Structural Inference from Conditional Knowledge Bases

There are several approaches implementing reasoning based on conditional knowledge bases, one of the most popular being System Z (Pearl, Proceedings of the 3rd conference on theoretical aspects of reasoning about knowledge, TARK ’90, Morgan Kaufmann Publishers Inc., San Francisco, CA, USA, pp. 121–135, 1990). We look at ranking functions (Spohn, The Laws of Belief: Ranking Theory and Its Philosophical Applications, Oxford University Press, Oxford, 2012) in general, conditional structures and c-representations (Kern-Isberner, Conditionals in Nonmonotonic Reasoning and Belief Revision: Considering Conditionals as Agents, vol. 2087 of LNCS, Springer, Berlin, 2001) in order to examine the reasoning strength of the different approaches by learning which of the known calculi of nonmonotonic reasoning (System P and R) and Direct Inference are applicable to these inference relations. Furthermore we use the recently proposed Enforcement-postulate (Kern-Isberner and Krümpelmann, Proceedings of the 22nd international joint conference on artificial intelligence, vol. 2, IJCAI’11, AAAI Press, pp. 937–942, 2011) to show dependencies between these approaches.     

Positive fantasies about idealized futures sap energy

Positive fantasies allow people to mentally indulge in a desired future. Whereas previous research found that spontaneously generated positive fantasies about the future predict poor achievement, we examined the effect of experimentally induced positive fantasies about the future. The present four experiments identify low energy, measured by physiological and behavioral indicators, as a mechanism by which positive fantasies translate into poor achievement. Induced positive fantasies resulted in less energy than fantasies that questioned the desired future (Study 1), negative fantasies (Study 2), or neutral fantasies (Study 3). Additionally, positive fantasies yielded a larger decrease in energy when they pertained to a more rather than a less pressing need (Study 4). Results indicate that one reason positive fantasies predict poor achievement is because they do not generate energy to pursue the desired future.     

The appeal of the devil’s eye: social evaluation affects social attention

Humans typically exhibit a tendency to follow the gaze of conspecifics, a social attention behaviour known as gaze cueing. Here, we addressed whether episodically learned social knowledge about the behaviours performed by the individual bearing the gaze can influence this phenomenon. In a learning phase, different faces were systematically associated with either positive or negative behaviours. The same faces were then used as stimuli in a gaze-cueing task. The results showed that faces associated with antisocial norm-violating behaviours triggered stronger gaze-cueing effects as compared to faces associated with sociable behaviours. Importantly, this was especially evident for participants who perceived the presented norm-violating behaviours as far more negative as compared to positive behaviours. These findings suggest that reflexive attentional responses can be affected by our appraisal of the valence of the behaviours of individuals around us.     

Rescuing stimuli from invisibility: Inducing a momentary release from visual masking with pre-target entrainment

At near-threshold levels of stimulation, identical stimulus parameters can result in very different phenomenal experiences. Can we manipulate which stimuli reach consciousness? Here we show that consciousness of otherwise masked stimuli can be experimentally induced by sensory entrainment. We preceded a backward-masked stimulus with a series of rapid visual events presented at 12 Hz for 800 ms. Peaks in visual sensitivity (d′) were observed when the target appeared at the time that the next entraining stimuli would have occurred. Observers’ sensitivity for identical masked near-threshold stimuli increased by factors as large as 55%, but only at this precise moment in time. These data thus reveal that awareness of near-threshold stimuli can be manipulated by entrainment to rhythmic events, supporting the functional role of induced oscillations in underlying cortical excitability, and suggest a plausible mechanism of temporal attention.     

Transfer of skill engendered by complex task training under conditions of variable priority

We explored the theoretical underpinnings of a commonly used training strategy by examining issues of training and transfer of skill in the context of a complex video game (Space Fortress, Donchin, 1989). Participants trained using one of two training regimens: Full Emphasis Training (FET) or Variable Priority Training (VPT). Transfer of training was assessed with a large battery of cognitive and psychomotor tasks ranging from basic laboratory paradigms measuring reasoning, memory, and attention to complex real-world simulations. Consistent with previous studies, VPT accelerated learning and maximized task mastery. However, the hypothesis that VPT would result in broader transfer of training received limited support. Rather, transfer was most evident in tasks that were most similar to the Space Fortress game itself. Results are discussed in terms of potential limitations of the VPT approach.     

Ambulante Psychotherapie in Deutschland aus Sicht der Patienten

This study analyzed the provision of outpatient psychotherapy services in Germany in standard practice settings. A total of 1,212 subjects who received or were still receiving outpatient psychotherapy during the past 6 years provided information about their experiences via a telephone survey. Outpatient psychotherapy was sought for many different conditions and was rated as highly effective. The improvement rates for all complaints were higher than 50%, except for obesity (37%) and sexual dysfunctions (44%). Patient ratings of worsening were less than 8% throughout. Treatment had very positive results not only for target symptoms but also for other aspects of patients?? lives. Almost 90% of those questioned stated that they were satisfied with their therapist. High agreement ratings were reported specifically with respect to positive therapeutic relationship, stable working alliance, experience of autonomy during therapy and therapists?? competency and ethical conduct. Patients gave their psychotherapists excellent evaluations and were highly satisfied with the changes achieved through treatment.     

Schwere Anorexia nervosa

Background

Psychosomatic support during acute medical treatment of patients with anorexia nervosa is a special need but up to now a rare constellation. These patients can barely accept necessary somatic procedures even if they suffer from severe consequences of the eating disorder. The ambivalence of patients towards treatment is explained by the loss of the right perception of their bodies and the strong obsession with further weight loss.

Methods

This article reports on eight consecutively treated patients on a medical ward who received a liaison psychosomatic, psychotherapeutic visit twice a week. The aim was to maintain better therapy adherence, to support oral food intake and understanding of the disorder as well as to motivate patients for further psychosomatic treatment.

Results

By means of a respectful cooperation between the departments of internal medicine and psychosomatics it was possible to gain psychotherapeutic access to the patients in this highly complicated situation.

Consequence

The psychodynamic aspects of this collaboration are discussed with a focus on the triangulation of the therapeutic process.     

Auditory Hallucinations as Social Self-Positions: A Theoretical Discussion from a Single-Case Study

This work uses social positioning analysis to investigate the phenomenon of the auditory verbal hallucination (AVH) in schizophrenia in order to describe its social and interactive nature. We focus in detail on a single-case study of a patient who verbalized her AVHs. We analyze 3 significant excerpts from an interview with a person with paranoid schizophrenia. This interview is part of a larger study conducted with 18 participants about life narrative construction in the sociocultural context of care homes. The interaction between the patient and her voices is examined closely to reveal the dynamic between interviewer, patient, and voices. The analysis differentiates the voice of the patient from that of the hallucination and reveals “social interaction” between this dyad and the interviewer. We discuss a possible social and interactive framework to understand the origin of AVHs and the self-construction process.     

Principles derived from the study of simple skills do not generalize to complex skill learning

We review research related to the learning of complex motor skills with respect to principles developed on the basis of simple skill learning. Although some factors seem to have opposite effects on the learning of simple and of complex skills, other factors appear to be relevant mainly for the learning of more complex skills. We interpret these apparently contradictory findings as suggesting that situations with low processing demands benefit from practice conditions that increase the load and challenge the performer, whereas practice conditions that result in extremely high load should benefit from conditions that reduce the load to more manageable levels. The findings reviewed here call into question the generalizability of results from studies using simple laboratory tasks to the learning of complex motor skills. They also demonstrate the need to use more complex skills in motor-learning research in order to gain further insights into the learning process.     

Patterns of comprehension performance in agrammatic Broca's aphasia: a test of the Trace Deletion Hypothesis

We tested the core prediction of the Trace Deletion Hypothesis (TDH) of agrammatic Broca's aphasia, which contends that such patients' comprehension performance is normal for active reversible sentences but at chance level for passive reversible sentences. We analyzed the comprehension performance of 38 Italian Broca's aphasics with verified damage to Broca's area, who completed sentence-to-picture matching tasks using active and passive reversible sentences as stimuli. The results failed to confirm the predictions made by TDH: only a small minority (15%) performed at chance on passive sentences and better than chance on active sentences. Furthermore, the distribution of the 38 subjects' performance on passive sentences differed from that predicted by the TDH since many more subjects performed at better-than-chance levels than expected. We discuss the implication of these results for claims about the distribution of language processing mechanisms in the brain.