On Usnadze's volume illusion

Summary Contrary to what was expected, subjects overestimated the volume in heavier objects, when making estimations with no visual cues available (a positive volume illusion). This finding contradicts the result of Usnadze. He found, that the heavier of two spheres, equal in volume, was perceived as the smaller by most subjects, with their eyes closed.The stimuli used were spheres and cylinders of different weights and volumes. In four experiments, the subjects reported their volume ratings with the help of two direct scaling methods, magnitude estimation or ratio estimation. Lifting stimuli with one sphere in each hand gave, as a result, a difference between hands. This difference was interpreted to imply, that the subjects did not just follow a strategy to give higher volume estimates to heavier objects.The positive volume illusion phenomenon, that appeared in all four experiments, was affected by such sources of variation as time (trial number), and size-weight interaction, defined as a stimulus context variable. Neither a strategy which assumes that the subjects judge density instead of volume, nor any other sizeweight interaction model is effective in explaining the volume illusion. The search for such a model was suggested as a line for future research, though.

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Zusammenfassung Gegensatz zur Erwartung scheinen schwerere Versuchskörper größeres Volumen zu haben als die leichteren, wenn Vpn die Volumina vergleichen, ohne sie anzusehen (eine positive Volumtäuschung). Dieses Resultat stimmt nicht mit den Ergebnissen von Usnadze. Er fand, daß wenn man zwei verschieden schwere, im übrigen aber ganz gleichartige Körper mit geschlossenen Augen, bloß tastend, auf ihre Größe vergleicht, so erscheint der Schwere kleiner, der Leichtere größer.Die Versuchskörper waren Kugeln und Zylinder verschiedenen Gewichtes und Volumens. In vier Versuchen schätzen die Vpn das Volumen mit Hilfe von zwei direkten Schätzmethoden, Magnitudenschätzung (magnitude estimation) und Verhältnisschätzung (ratio estimation), jedoch ohne die Versuchskörper sehen zu dürfen. Das Heben der Versuchskörper mit einer Kugel in jeder Hand gab als Resultat einen Unterschied zwischen den Händen. Dieser Unterschied schien zu bedeuten, daß die Vpn nicht automatisch schweren Körpern ein größeres Volumen gaben.Die positive Volumtäuschung, die in allen vier Versuchen erschien, war durch solche Faktoren wie Zeit (Nummer der Vergleichsfälle), und Größe-Gewichtwechselwirkung, definiert in der Verschiedenheit der vorhandenen Versuchskörper, beeinflußt. Die Versuchsdaten stützen nicht die Hypothese, daß die Vpn versuchten die Dichte der Versuchskörper zu schätzen. Auch wurde kein brauchbares Modell für die Wechselwirkung gefunden um die Volumtäuschung zu illustrieren. Ein solches Modell wurde doch für zukünftige Forschung vorgeschlagen.

     

Effects of white noise and irrelevant information on speeded classification: A developmental study

The study examined how well subjects were able to ignore the presence of irrelevant stimulus information in noise and in silence, as a function of age. Children aged six and nine, and adults, performed speeded card-sorting tasks with one binary dimension relevant and zero or two dimensions irrelevant. The presence of irrelevant information interfered with performance, the magnitude of interference declining with age. The interfering effects of irrelevant information were greater when it was (relatively) more salient than when it was less salient, but there was no interaction between relative salience and the effects of noise. Noise (95 dB(A)) slowed down sorting performance of adult subjects in all conditions, it slightly improved the performance of nine-year-old children, and it improved the performance of six-year-old children significantly when irrelevant information was present. The effects of noise on attentional control are discussed, mainly with reference to inhibitory effects of noise on subvocal activity.     

Stress and happiness among adolescents with varying frequency of physical activity

The aim of this cross-sectional study was to investigate associations between physical activity, stress, and happiness, as well as possible sex and age differences on these variables in a survey of 1,508 adolescent pupils (13 to 18 yr.) in middle Norway. Adolescents who reported they participated in physical activity 2 to 3 times per week or more scored significantly lower on stress and higher on happiness than those who participated in physical activity 1 day per week or less. There was no significant difference on stress and happiness between those being physically active 2 or 3 times a week and those being active almost every day. There was no sex difference in physical activity frequency. Girls had higher mean scores on stress, and boys scored higher on happiness. Adolescents 15 to 16 years old showed higher stress scores than those 17 to 18 years old, but there were no significant differences between the different age groups when looking at happiness and physical activity. A statistically significant two-way interaction of sex by age was found on both stress and happiness.     

Perceived Conflict and Leader Dominance: Individual and Contextual Factors Behind Preferences for Dominant Leaders

Recent research finds that political candidates and leaders with dominant, masculine physical features are more preferred under conditions of conflict than of cooperation. Importantly, however, methodological limitations of past research have hindered the identification of whether this effect reflects that voters intuitively view (1) dominant leaders as more competent in solving problems of conflict, (2) nondominant leaders as more competent in solving problems of cooperation, or (3) both. In this article, we utilize recent advances in evolutionary psychology to form precise predictions on the nature of the underlying psychology and employ an unprecedented array of data types—including highly controlled experiments, natural experiments, and behavioral measures—to investigate the validity of these predictions. Using large approximately nationally representative surveys of 2,009 Poles and Ukrainians fielded during the Crimea crisis in 2014, we find that preferences for leader dominance are exclusively driven by the intuition that dominant leaders are better able to facilitate aggressive responses during social conflict and that these preferences are regulated by contextual conditions and individual predispositions related to such responses.     

Upper‐Body Strength and Political Egalitarianism: Twelve Conceptual Replications

Animal models of conflict behavior predict that an organism's behavior in a conflict situation is influenced by physical characteristics related to abilities to impose costs on adversaries. Stronger and larger organisms should be more motivated to seek larger shares of resources and higher places in hierarchies. Previous studies of human males have suggested that measures of upper‐body strength are associated with measures of support for inequality including Social Dominance Orientation (SDO), a measure of individual differences in support for group‐based hierarchies. However, other studies have failed to replicate this association. In this article, we reexamine the link between upper‐body strength and support for inequality using 12 different samples from multiple countries in which relevant measures were available. These samples include student and locally representative samples with direct measures of physical strength and nationally representative samples with self‐reported measures related to muscularity. While the predicted correlation does not replicate for every single available measure of support for inequality, the overall data pattern strongly suggests that for males, but not females, upper‐body strength correlates positively with support for inequality.     

The unique effects of blatant dehumanization on attitudes and behavior towards Muslim refugees during the European ‘refugee crisis’ across four countries

Blatant dehumanization has recently been demonstrated to predict negative outgroup attitudes and behaviors. Here, we examined blatant dehumanization of Muslim refugees during the ‘Refugee Crisis’ among large samples in four European countries: the Czech Republic (N = 1307), Hungary (N = 502), Spain (N = 1049), and Greece (N = 934). Our results suggest that blatant dehumanization of Muslim refugees is (a) prevalent among Europeans, and (b) uniquely associated with anti‐refugee attitudes and behavior, beyond political ideology, prejudice, and—of particular relevance to the refugee crisis—empathy. We also find that blatant dehumanization of Muslim refugees is significantly higher and more strongly associated with intergroup behavior in the Eastern European countries (especially the Czech Republic) than in Spain and Greece. Examining a range of outgroup targets beyond refugees, our results further illustrate that blatant dehumanization is not purely an ethnocentric bias: while individuals across contexts feel warmer towards their group than all others, they rate several high‐status outgroups as equally or more fully ‘evolved and civilized’ than the ingroup. Our research extends theoretical understanding of blatant dehumanization, and suggests that blatant dehumanization plays an important and independent role in the rejection of Muslim refugees throughout Europe.     

Science-Based Neurorehabilitation: Recommendations for Neurorehabilitation From Basic Science

ABSTRACT

Neuroscience has fundamentally changed the understanding of learning and memory within recent years. Here, the authors discuss a number of specific areas where they believe new understanding of the CNS from basic science is having a fundamental impact on neurorehabilitation and is leading to new therapeutic approaches. These areas have constituted a basis for development of some basic principles for neurorehabilitation: Optimal rehabilitation should involve (a) active (patient) participation in the training, (b) training that does not only involve many repetitions, but also continues to challenge the skill of the training person, (c) motivation and reward, (d) intensive training and practice over a long time, (e) careful organization of the training in relation to other activities, and (f) incorporation of other potentially beneficial parameters such as sleep and diet. It should in this relation also be pointed out that albeit neurorehabilitation may be predicted to have the most optimal effect early in life and as soon after injury as possible, there is no reason to believe that beneficial effects of training may not be obtained late in life or several years after injury.     

Why Not Community? An Exploration of the Value of Community in Cohen's Socialism

Res Publica - The work of prominent analytical Marxist G. A. Cohen provides a vision of socialism which has distributive justice and community at its core. While Cohen's view of distributive...