An Impossibility Theorem on Beliefs in Games

A paradox of self-reference in beliefs in games is identified, which yields a game-theoretic impossibility theorem akin to Russell’s Paradox. An informal version of the paradox is that the following configuration of beliefs is impossible:Ann believes that Bob assumes thatAnn believes that Bob’s assumption is wrongThis is formalized to show that any belief model of a certain kind must have a ‘hole.’ An interpretation of the result is that if the analyst’s tools are available to the players in a game, then there are statements that the players can think about but cannot assume. Connections are made to some questions in the foundations of game theory.Special Issue Ways of Worlds II. On Possible Worlds and Related Notions Edited by Vincent F. Hendricks and Stig Andur Pedersen     

Does Human Facial Attractiveness Honestly Advertise Health? Longitudinal Data on an Evolutionary Question

Inspired by the evolutionary conjecture that sexually selected traits function as indicators of pathogen resistance in animals and humans, we examined the notion that human facial attractiveness provides evidence of health. Using photos of 164 males and 169 females in late adolescence and health data on these individuals in adolescence, middle adulthood, and later adulthood, we found that adolescent facial attractiveness was unrelated to adolescent health for either males or females, and was not predictive of health at the later times. We also asked raters to guess the health of each stimulus person from his or her photo. Relatively attractive stimulus persons were mistakenly rated as healthier than their peers. The correlation between perceived health and medically assessed health increased when attractiveness was statistically controlled, which implies that attractiveness suppressed the accurate recognition of health. These findings may have important implications for evolutionary models.     

Response selection influences inhibition of return

Previous work has suggested that there may be a relationship between the magnitude of inhibition of return (IOR) and the number of possible responses in the perceptual‐motor task. To test this possibility, the present experiment used a display that contained four horizontally aligned cue/target locations. In different blocks of trials, subjects responded to the target either with a one‐response detection key press, a two‐response localisation key press, or a four‐response localisation key press. The results showed the largest magnitude of IOR was found in the one‐response condition and the least in the four‐response condition. These results suggest that IOR may be most effective in inhibiting relatively prepotent responses and the inhibitory effect weakens when responses require more intricate sensorimotor mappings.     

Gender, grade, and relationship differences in emotional closeness within adolescent friendships

Previous research has examined gender and grade differences in the emotional closeness of adolescents' same- and cross-sex friendships. However, findings from these studies have been inconsistent because they have failed to (1) differentiate between cross-sex friendships and romantic relationships and (2) compare same- and cross-sex friendships. In an attempt to clarify previous findings, gender and grade differences in adolescent reports of emotional closeness within same- and cross-sex friendships were examined in the current study. Responses from two hundred seventy adolescents indicated gender differences in reports of time spent with their friends daily and levels of relationship closeness, cohesion, and commitment. Further, grade moderated relationship differences in reports of relationship cohesion and closeness. Differences in predictors of intimacy support previous studies that have found grade and gender differences in levels of intimacy in adolescents' same- and cross-sex friendships. Results also elaborate on previous research by indicating grade differences in adolescents' perceptions of cohesion and closeness in their same- and cross-sex friendships. Findings are discussed in terms of understanding differences in adolescent reports of intimacy within same- and cross-sex friendships.     

Adolescents’ reactions to the world trade center destruction: A study of political trauma in metropolitan New York

This study examined the emotional response of 110 adolescents living in the New York metropolitan area one month and five months after the destruction of the World Trade Center (WTC) by terrorists. The purpose of the study was to assess emerging hypotheses in political psychology that suggest that there are differential emotional responses to a national trauma that recede in predictable directions. The results followed predictions and indicate that adolescents experienced a higher level of emotions related to the Crisis and Bereavement dimension than affect associated with Vulnerability and that the emotional response decreased during the four-month follow-up period. There was no effect on emotional response from the biological sex or political orientation of the respondents, which is inconsistent with other studies in the literature. The absence of a political orientation effect is explained in terms of the lack of a domestic ideological difference in response to the terrorist attack.     

Existential Beliefs,Social Satisfaction,and Well-Being Among Catholic,Jewish, and Protestant Older Adults

Religiousness, spirituality, and existential beliefs are important sources of well-being yet neither their specific effects nor group variation in them is well understood. In a sample of more than 1,000 older adults, we found that certain existential beliefs or concerns (fear of God, death anxiety, belief in life after death, concerns about being mourned) are correlates of well-being in older adults and differed across religious groups. Protestants reported better well-being than Catholics and Jews. Differences in social satisfaction and existential concerns partially explained these differences, which were not explained by demographics. These results suggest the importance of studying well-being and religion in a way that appreciates the differences among religious groups and further of looking at the specific beliefs of different groups.     

Mind,Soul and Spirit: Conceptions of Immaterial Identity in Different Cultures

The cognitive science of religion has recently focused attention on whether concepts of mind, soul, and spirit derive from the same or different intuitive foundations of immaterial identity. The present research is the first to look at intuitions about these three concepts simultaneously in different cultures. Methodologically, hypothetical transplants or transfers of minds or brains have been commonly used to examine the development of inferences about the continuity of mental identity despite bodily displacement. The present research extends the transfer paradigm to compare inferences about transfers of “soul” and “spirit” as well as the “mind.” American, Brazilian, and Indonesian undergraduate participants were presented with a series of scenarios in which a character's soul, mind, or spirit is transferred to another character's body. Participants made judgments about the consequences of such transfers on behaviors selected to potentially differentiate underlying intuitive categories. Results indicate that intuitions of soul, spirit, and mind do appear to draw from different but overlapping intuitions, which are recruited in different ways depending on religion and country. For American and Indonesian participants, the mind transfer was judged more often to result in a displacement of cognitive attributes compared to bodily, social, and moral attributes. Across the three countries, the transfer of spirit led more frequently to judgments about displacement of passion than of ability; religiosity was associated with giving more weight to the transfer of the soul, thus resulting in a greater displacement of all types of attributes. The results emphasize the importance of considering how different intuitive foundations, such as essentialism, intuitive psychology, and vitalism, might be recruited by culture to highlight different aspects of immaterial identity.