Gödelizing the Yablo Sequence

We investigate what happens when ‘truth’ is replaced with ‘provability’ in Yablo’s paradox. By diagonalization, appropriate sequences of sentences can be constructed. Such sequences contain no sentence decided by the background consistent and sufficiently strong arithmetical theory. If the provability predicate satisfies the derivability conditions, each such sentence is provably equivalent to the consistency statement and to the Gödel sentence. Thus each two such sentences are provably equivalent to each other. The same holds for the arithmetization of the existential Yablo paradox. We also look at a formulation which employs Rosser’s provability predicate.     

Łukasiewicz and Popper on Induction

We compare Jan ?ukasiewicz's and Karl Popper's views on induction. The English translation of the two ?ukasiewicz's papers is included in the Appendix.     

Social orientations and adolescent health behaviours in Hungary

Adolescent health behaviours are influenced by a variety of social factors, including social orientations, such as social comparison or competitiveness. The main goal of the present study was to investigate the role that these social orientations might play in health behaviours (both health‐impairing and health‐promoting). Data were collected from high school students (N = 548; ages 14–20 years; 39.9% males) in two counties of the Southern Plain Region of Hungary. The self‐administered questionnaires contained items on sociodemographics, such as age, sex, parental schooling, and socioeconomic status (SES) self‐assessment; school achievement, health behaviours, competitiveness and social comparison. Multiple regression analyses suggest that those who scored higher on competitiveness engaged in more substance use, a pattern that was not present for health‐promoting behaviours. Social comparison, however, was associated with lower levels of substance use. In addition, in relation to health‐impairing behaviours, both competitiveness and social comparison interacted with sex; both social orientation variables proved to be more important for boys. Social comparison also contributed to health‐promoting behaviours among boys. Findings support the idea that the role of social orientations, such as competitiveness and social comparison, can be quite different depending on sex and the nature of the health behaviour. While competitiveness may act as a risk factor for substance use among boys, social comparison may act as a protection. It appears that social orientations play less of a role in girls' health‐related behaviours. More focus is needed on gender differences in influences on adolescents' health‐related behaviours.     

Political Conservatism,Need for Cognitive Closure,and Intergroup Hostility

Two studies examined the interaction of political conservatism and the need for cognitive closure in predicting aggressiveness in intergroup conflict and hostility toward outgroups. In the first study, Polish participants indicated their preference for coercive conflict strategies in the context of a real‐life intergroup conflict. Only among participants who identify themselves as conservative, need for cognitive closure was positively and significantly related to preference for aggressive actions against the outgroup. In the second study, the predicted interaction was investigated in the context of the terrorist threat in Poland. The findings indicated that high in need for closure conservatives showed greater hostility against Arabs and Muslims only when they believed that Poland was under threat of terrorist attacks inspired by Islamist fundamentalism.     

Tradycyjna teoria wnioskowania bezpośredniego jako pewien fragment dwuwartościowego rachunku zdań

Allatwn est die 16 Septembris 1959     

Executive Resources and Item-Context Binding: Exploring the Influence of Concurrent Inhibition,Updating, and Shifting Tasks on Context Memory

Previous research has demonstrated that context memory performance decreases as a result of cognitive load. However, the role of specific executive resources availability has not been specified yet. In a dual-task experiment, participants performed three kinds of concurrent task engaging: inhibition, updating, or shifting operations. In comparison with a no-load single-task condition, a significant decrease in item and context memory was observed, regardless of the kind of executive task. When executive load conditions were compared with non-specific cognitive load conditions, a significant interference effect was observed in the case of the inhibition task. The inhibition process appears to be an aspect of executive control, which relies on the same resource as item-context binding does, especially when binding refers to associations retrieved from long-term memory.     

Auditory rhythms are systemically associated with spatial-frequency and density information in visual scenes

A variety of perceptual correspondences between auditory and visual features have been reported, but few studies have investigated how rhythm, an auditory feature defined purely by dynamics relevant to speech and music, interacts with visual features. Here, we demonstrate a novel crossmodal association between auditory rhythm and visual clutter. Participants were shown a variety of visual scenes from diverse categories and asked to report the auditory rhythm that perceptually matched each scene by adjusting the rate of amplitude modulation (AM) of a sound. Participants matched each scene to a specific AM rate with surprising consistency. A spatial-frequency analysis showed that scenes with greater contrast energy in midrange spatial frequencies were matched to faster AM rates. Bandpass-filtering the scenes indicated that greater contrast energy in this spatial-frequency range was associated with an abundance of object boundaries and contours, suggesting that participants matched more cluttered scenes to faster AM rates. Consistent with this hypothesis, AM-rate matches were strongly correlated with perceived clutter. Additional results indicated that both AM-rate matches and perceived clutter depend on object-based (cycles per object) rather than retinal (cycles per degree of visual angle) spatial frequency. Taken together, these results suggest a systematic crossmodal association between auditory rhythm, representing density in the temporal domain, and visual clutter, representing object-based density in the spatial domain. This association may allow for the use of auditory rhythm to influence how visual clutter is perceived and attended.