Beiträge zur Psychologie der Gestalt

Zusammenfassung Im Teil I bestätigten wir das Resultat von Fuchs über den Einfluß einer Form auf die Farbe ihrer Teile und erbrachten einiges Material zur quantitativen Bestimmung dieses Einflusses. Liegen von 12 auf der Peripherie eines Kreises angeordneten gelben Scheibchen einige hinter einem blauen Episcotister, so werden diese von den außerhalb liegenden gelb gefärbt. Der Grad dieser Färbung hängt ab 1. von dem Verhältnis der Zahl der außen liegenden Scheibchen zu der Zahl der im Episcotisterfeld befindlichen, 2. von figuralen Faktoren: je stärker der figurale Zusammenhang zwischen den Scheibchen drinnen und draußen, um so stärker die färbende Wirkung.Im II. Teil versuchten wir den Faktoren nachzugehen, von denen die Durchsichtigkeit eines Episcotisters konstanter Öffnung abhängt. Als solche Faktoren ergaben sich: Helligkeit des Hintergrundes, Helligkeit des Episcotisters (beide wirken im entgegengesetzten Sinn), Helligkeitsdifferenz zwischen Episcotister und Hintergrund und Ausgeprägtheit der auf dem Hintergrund erscheinenden Figur. Es ergaben sich Bedingungen, unter denen der Episcotister unsichtbar wurde, und es ließ sich diese Unsichtbarkeit als höchster Grad von Durchsichtigkeit auffassen. Die Durchsichtigkeit ging ferner Hand in Hand mit anderen Strukturbeschaffenheiten des Episcotisters, auch die phänomenale Helligkeit des Episcotisters war von dem Grad seiner Durchsichtigkeit nicht unabhängig.     

Social Media in Disaster Risk Reduction and Crisis Management

This paper reviews the actual and potential use of social media in emergency, disaster and crisis situations. This is a field that has generated intense interest. It is characterised by a burgeoning but small and very recent literature. In the emergencies field, social media (blogs, messaging, sites such as Facebook, wikis and so on) are used in seven different ways: listening to public debate, monitoring situations, extending emergency response and management, crowd-sourcing and collaborative development, creating social cohesion, furthering causes (including charitable donation) and enhancing research. Appreciation of the positive side of social media is balanced by their potential for negative developments, such as disseminating rumours, undermining authority and promoting terrorist acts. This leads to an examination of the ethics of social media usage in crisis situations. Despite some clearly identifiable risks, for example regarding the violation of privacy, it appears that public consensus on ethics will tend to override unscrupulous attempts to subvert the media. Moreover, social media are a robust means of exposing corruption and malpractice. In synthesis, the widespread adoption and use of social media by members of the public throughout the world heralds a new age in which it is imperative that emergency managers adapt their working practices to the challenge and potential of this development. At the same time, they must heed the ethical warnings and ensure that social media are not abused or misused when crises and emergencies occur.     

Effects of anonymous peer observation on adolescents' preference for immediate rewards

Research suggests that the presence of peers influences adolescent risk‐taking by increasing the perceived reward value of risky decisions. While prior work has involved observation of participants by their friends, the current study examined whether observation by an anonymous peer could elicit similarly increased reward sensitivity. Late adolescent participants completed a delay discounting task either alone or under the belief that performance was being observed from a neighboring room by an unknown viewer of the same gender and age. Even in this limited social context, participants demonstrated a significantly increased preference for smaller, immediate rewards when they believed that they were being watched. This outcome challenges several intuitive accounts of the peer effect on adolescent risk‐taking, and indicates that the peer influence on reward sensitivity during late adolescence is not dependent on familiarity with the observer. The findings have both theoretical and practical implications for our understanding of social influences on adolescents' risky behavior.     

Infinitesimals are too small for countably infinite fair lotteries

We show that infinitesimal probabilities are much too small for modeling the individual outcome of a countably infinite fair lottery.     

Idealized and perspectival representations: some reasons for making a distinction

I argue that an adequate understanding of the practice of constructing models in physics requires a distinction between two strategies that are commonly both labeled ‘idealization’. The formal characteristic of both methods is to let a parameter in the equations for a target system go to zero. But the discussion of examples from various applications of perturbation theory shows that there is in general a difference with respect to the aims such limiting procedures are supposed to serve; and with different aims comes the need to characterize the means (the interpretation of the limits) differently. I therefore suggest that we distinguish ‘idealizations’ from ‘perspectives’ or perspectival representations.     

Happy but unhealthy: The relationship between social ties and health in an emerging network

Social connections are essential to health and well‐being. However, when pursing social acceptance, people may sometimes engage in behavior that is detrimental to their health. Using a multi‐time‐point design, we examined whether the structure of an emerging network of students in an academic summer school program correlated with their physical health and mental well‐being. Participants who were more central in the network typically experienced greater symptoms of illness (e.g., cold/flu symptoms), engaged in riskier health behaviors (e.g., binge drinking), and had higher physiological reactivity to a stressor. At the same time, they were happier, felt more efficacious, and perceived less stress in response to a strenuous math task. These outcomes suggest that social ties in an emerging network are associated with better mental well‐being, but also with poorer physical health and health behaviors. Copyright © 2014 John Wiley & Sons, Ltd.     

Is there a dilemma for the truthmaker non-maximalist?

Mark Jago has presented a dilemma for truthmaker non-maximalism—the thesis that some but not all truths require truthmakers. The dilemma arises because some truths that do not require truthmakers by the non-maximalist’s lights (e.g., that Santa Claus does not exist) are necessitated by truths that do (e.g., that Barack Obama knows that Santa Claus does not exist). According to Jago, the non-maximalist can supply a truthmaker for such a truth only by conceding the primary motivation for the view: that it allows one to avoid positing strange ‘negative’ entities without adopting a non-standard account of the necessary features of ordinary things. In this paper, I sketch out and defend two plausible non-maximalist proposals that evade Jago’s dilemma.