Eine informationstheoretische Methode zur Bestimmung der ästhetischen Wirkung von Flächenmustern

Zusammenfassung In dieser Arbeit entwickeln wir eine Form der informationsanalytischen Charakterisierung von Flächenmustern, welche es ermöglicht, schön wirkende von häßlich wirkenden Mustern zu trennen. Wir betrachten ein Flächenmuster als eine Menge von Rasterpunkten. Jeder Rasterpunkt kann hinsichtlich der drei Variablen horizontale Lage, vertikale Lage und Farbton kategorisiert werden. Wir charakterisieren durch eine multivariate Informationsanalyse die statistischen Beziehungen zwischen den genannten Variablen mit zwei Kennwerten. Diese Kennwerte sind die Interaktion zwischen den drei Variablen und ein Balancekoeffizient für die Variablen horizontale und vertikale Lage. Hinsichtlich dieser beiden Kennwerte unterscheiden sich Muster, die von Vpn als schön empfunden werden von solchen, die als häßlich empfunden werden. Schöne Muster haben signifikant höhere Interaktionen und signifikant niedrigere Balancekoeffizienten als häßliche. Hinsichtlich beider Parameter streuen schöne Muster signifikant weniger als häßliche.

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An information analytic method to estimate the esthetical effect of pictures

Summary In this paper we show, that multivariate information analysis can be used to separate pictures regarded as nice from pictures regarded as ugly. A picture may be considered as a set of pictureelements. Each pictureelement can be classified with regard to three variables, namely vertical position, horizontal position and colour tone. We characterize the statistical relations between these variables by multivariate information analysis which results in two parameters. These parameters are the interaction between the variables and a balance coefficient for the variables vertical- und horizontal-position. In respect of these parameters pictures, which are regarded as nice by human subjects are separable from ugly pictures. Nice pictures show significantly higher interactions and lower balance coefficients than ugly ones. The dispersion of interactions and balance coefficients is lower at nice pictures.

     

Acute non-traumatic transverse syndrome from a neurosurgical standpoint]

With a seventh of 233 neuro-surgical patients operated on in the area of the spinal canal, an acute or sub-acute transverse syndrome had become manifest before operation. The analysis of these cases shows that 2 out of 12 cervical, and 12 out of 100 lumbar cases of dislocation of the disk cause an acute or sub-acute transverse lesion of the cord with paraplegia. In 56 cases of intradural extra-medullary tumours, no acute development was observed. However, this was seen in 55% of the extra-dural tumour growths. The role of a vasal component in the event of speedy development of the transverse symptomatology in such cases is mentioned.     

What is magic about the magical number four?

Summary Previous studies have shown that the apprehension of number can be represented by three models according to the experimental procedure and the data analysis. The present experiment was designed to test the effect of figural characteristics of pattern on the response time. The subjects were asked to perform a same/different judgment, i.e., they were requested to decide whether a dot pattern, shown on a monitor, equalled a previously defined target number (n=2–6) or not. Different types of pattern were used and learning effects were studied. As was expected, the slopes for random and linear patterns were not so steep when the target number was low. With patterns in the dice mode, however, the slope was zero. Repeated presentations led to a slight reduction in slope for random and linear patterns only. In the case of the patterns in the dice mode, the repeated presentations caused only a change in the absolute reaction times (RTs) but had no effect on the slope. When the target numbers were larger (n=5–6), the repeated presentations led to remarkable reductions in slope for random and linear patterns. The slope discontinuity at n=4 occurred with all types of pattern but it became less pronounced in the course of training at least in the case of random and linear patterns. This result is explained by clustering effects, use of figural cues, and a more efficient scanning process.     

The effects of attractiveness, dominance, and attribute differences on information acquisition in multiattribute binary choice

Two process tracing studies investigated how the information acquisition process in a binary choice task is influenced by the overall level of attractiveness of alternatives, by the magnitude of differences in attractiveness of alternatives, and by the dominance of one alternative. All three factors influenced the subjects' information selection process regarding the multiattribute choice alternatives. Subjects selected more information when the attractiveness difference was small and when one of the alternatives was not dominant. Moreover, they considered more information when the choice alternatives were both unattractive. These findings were obtained when information was presented about the alternatives both numerically and nonnumerically. The experimental results were explained within a sequential sampling strategy framework.     

Assessing the Influence of Psychosocial and Career Mentoring on Organizational Attractiveness

Past research on mentoring in organizational settings has focused on psychosocial and career mentoring functions more senior employees provide to new hires. In this study, we examined whether the perceived quality of psychosocial and career functions of pre‐hire mentoring and realistic job previews (RJPs) provided to students through mentoring impact organizational attraction and potential applicants' intentions to pursue or accept jobs at their mentors' organization, and ultimately their acceptance of positions with their mentors' organization. We compared face‐to‐face mentoring with online mentoring. A field study was conducted (n=194 European graduate students). Findings indicate that the quality of psychosocial mentoring plays a larger role in organizational attraction and intentions to pursue jobs than the perceived level/quality of career mentoring functions, with RJPs functioning as a suppressor variable. Obtaining a job with the mentors' organization was related to career, but not to psychosocial mentoring functions or RJPs.     

Tool use as a way to assess cognition: how do captive chimpanzees handle the weight of the hammer when cracking a nut?

Tool use in apes has been considered a landmark in cognition. However, while most studies concentrate on mental operations, there are very few studies of apes’ cognition as expressed in manual skills. This paper proposes theoretical and methodological considerations on movement analysis as a way of assessing primate cognition. We argue that a privileged way of appraising the characteristics of the cognitive abilities involved in tool use lies at the functional level. This implies that we focus on how the action proceeds, and more precisely, on how the functional characteristics of the task are generated. To support our view, we present the results of an experiment with five captive chimpanzees investigating the way how chimpanzees adapt to hammers of various weights while cracking nuts. The movement performed in the hammering task is analyzed in terms of energy production. Results show that chimpanzees mobilise passive as well as active forces to perform the compliant movement, that is, they modulate the dynamics of the arm/tool system. A comparison between chimpanzees suggests that experience contributes to this skill. The results suggest that in tool use, movements are not key per se, but only in as much as they express underlying cognitive processes. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.

A randomized controlled trial of expressive writing in breast cancer survivors with lymphedema

Objective: Breast cancer survivors who develop lymphedema report poorer quality of life (QoL) than those without lymphedema. Expressive writing is a potential intervention to address QoL.

Design: Adult women (N = 107) with breast cancer and chronic Stage II lymphedema were randomised to writing about thoughts and feelings specific to lymphedema and its treatment (intervention) or about daily activities (control) for four, 20-min sessions.

Main Outcome Measures: Outcome measures were several indicators of QoL assessed at baseline, one, three, and six months post-intervention (total scores and subscales of Upper Limb Lymphedema 27 and Functional Assessment of Cancer Therapy–Breast). Hypothesised moderators of change in QoL were dispositional optimism, avoidant behaviours, and time since lymphedema diagnosis.

Results: There was no statistically significant intent-to-treat main effects of expressive writing on QoL. Statistically significant moderating effects on change in different indicators of QoL were observed for all three moderators. Expressive writing was more effective for improving QoL in women who were higher on optimism, lower on avoidance and had less time since a lymphedema diagnosis.

Conclusion: These results provide further evidence that there are subsets of individuals for whom expressive writing is more effective. Future research may investigate targeting expressive writing based on identified moderators.     

Endurance exercise selectively impairs prefrontal-dependent cognition

Two experiments are reported that examine the possibility that exercise selectively influences different types of cognition. To our knowledge, these experiments represent the first attempt to study higher-cognitive processes during exercise. Theoretical thinking was guided by the transient hypofrontality hypothesis. In both experiments, athletes who exercised at a sustained, moderate pace were compared to sedentary controls on two neuropsychological tests, one that is generally regarded as heavily dependent on prefrontal cognition and one that is relatively insensitive to prefrontal operation. Results showed that during exercise performance on tests demanding prefrontal-dependent cognition was impaired, while at the same time, cognitive processes requiring little prefrontal activity were unaffected.     

Keeping it short: a comparison of methods for brief picture presentation

Abstract— Research has shown that backward masking is a powerful tool for studying unconscious mental processes. Whereas studies have traditionally presented stimuli using cathode-ray tube (CRT) monitors or mechanical shutters together with slide projectors, recent studies (mainly in functional magnetic resonance imaging, fMRI) have begun to use methods based on liquid crystal displays (LCDs) and thin-film transistor (TFT) technology. However, because of differences in technology, all methods may not be equally suited for masking. When methods were compared for their accuracy in presenting pictures at short durations, LCD and TFT presentations had poor accuracy, but shutter and CRT presentations had better accuracy. Because CRTs interfere with the imaging process in fMRI, we recommend the use of mechanical shutters. However, our results may not generally apply to all displays, so we advise researchers to validate the presentation parameters of their displays. The procedure described here may be useful for that purpose.