Testing the coplanar ratio hypothesis of lightness perception

What determines an object's lightness remains unclear, but it is generally thought that the ratios of its luminance to the luminance of other objects in a scene play a crucial role because these ratios allow the relative reflectance of each object to be estimated, providing all the objects are under the same illumination. Because objects that lie in the same plane are typically illuminated equally, it has been suggested that it is the luminance ratios between coplanar objects that primarily determine lightness (Gilchrist, 1977 Science 195 185-187; Gilchrist et al, 1999 Psychological Review 106 795-834). An alternative hypothesis is that perceived illumination differences can affect lightness directly. As the studies that provided evidence for the coplanar ratio hypothesis always varied the illumination and the coplanar relationships simultaneously, it is unclear which hypothesis is correct. I measured the influence of each factor separately and found that the perceived illumination differences have a greater effect on lightness.     

Exploring the validity of the Mayer-Salovey-Caruso Emotional Intelligence Test (MSCEIT) with established emotions measures

Emotions measures represent an important means of obtaining construct validity evidence for emotional intelligence (EI) tests because they have the same theoretical underpinnings. Additionally, the extent to which both emotions and EI measures relate to intelligence is poorly understood. The current study was designed to address these issues. Participants (N = 138) completed the Mayer-Salovey-Caruso Emotional Intelligence Test (MSCEIT), two emotions measures, as well as four intelligence tests. Results provide mixed support for the model hypothesized to underlie the MSCEIT, with emotions research and EI measures failing to load on the same factor. The emotions measures loaded on the same factor as intelligence measures. The validity of certain EI components (in particular, Emotion Perception), as currently assessed, appears equivocal.     

Strength-Based Assessment of Rural African American Early Adolescents: Characteristics of Students in High and Low Groups on the Behavioral and Emotional Rating Scale

Early adolescents strengths were examined in relation to factors that are associated with developmental risk or resilience in two rural low-income southern communities. The sample was comprised 279 students (101 boys, 178 girls), all of whom were African American and reflected the public school attendance of this community. Parent reports on the Behavioral and Emotional Rating Scale (BERS) were used to assess strengths. BERS scores were examined in relation to academic, behavioral, and social characteristics of participants. For girls, total strength scores on the BERS were positively associated with indices of high competence and negatively associated with problematic characteristics. For boys, high and low total strength scores differentiated between youth who did and did not have risks associated with externalizing behavior problems. The results are discussed in terms of their implications for assessment and prevention.     

Adrenocorticotrophic hormone modulates Escherichia coli O157:H7 adherence to porcine colonic mucosa

Exposure to stress is associated with susceptibility to disease and one stress mediator, norepinephrine, has been reported to enhance the adherence of enterohemorrhagic Escherichia coli O157:H7 (EHEC) to the colonic mucosa. We tested the hypothesis that adrenocorticotropic hormone (ACTH) and other stress-related hormones may act in a similar fashion. Explants of distal colonic mucosa from young pigs were mounted in Ussing chambers and their luminal aspect was exposed to EHEC strain 700728 for 30-90 min. When added to the contraluminal, but not luminal bathing medium, ACTH increased EHEC adherence within 90 min in a concentration-dependent manner (EC50 = 1.2 nM), but did not alter tissue electrical conductance. ACTH had no effect on the adherence of a pig-adapted non-O157 E. coli strain. The effect of 0.1 microM ACTH on luminal EHEC adherence was prevented in tissues pretreated contraluminally with the type 2 melanocortin receptor antagonist ACTH7-38, the neuronal conduction blocker saxitoxin, or the muscarinic cholinergic antagonist atropine. Moreover, ACTH7-38 decreased EHEC adherence in the absence of ACTH. These results suggest that ACTH acts via melanocortin receptors located on enteric nerves to enhance mucosal adherence of EHEC.     

Mortgaging the future: Dumping ethics with nuclear waste

On August 22, 2005 the U.S. Environmental Protection Agency issued proposed new regulations for radiation releases from the planned permanent U.S. nuclear-waste repository in Yucca Mountain, Nevada. The goal of the new standards is to provide public-health protection for the next million years — even though everyone admits that the radioactive wastes will leak. Regulations now guarantee individual and equal protection against all radiation exposures above the legal limit. Instead E.P.A. recommended different radiation exposure-limits for different time periods. It also recommended using only the arithmetic mean of the dose distribution, to assess regulatory compliance during one time period, but using only the median dose to assess compliance during another period. This piece argues that these two changes — in exposure-limits and in methods of assessing regulatory compliance — have at least four disturbing consequences. The changes would threaten equal protection, ignore the needs of the most vulnerable, allow many fatal exposures, and sanction scientifically flawed dose calculations.     

Can children recognize pride?

Recent research has shown that pride, like the "basic" emotions of anger, disgust, fear, happiness, sadness, and surprise, has a distinct, nonverbal expression that can be recognized by adults (J. L. Tracy & R. W. Robins, 2004b). In 2 experiments, the authors examined whether young children can identify the pride expression and distinguish it from expressions of happiness and surprise. Results suggest that (a) children can recognize pride at above-chance levels by age 4 years; (b) children recognize pride as well as they recognize happiness; (c) pride recognition, like happiness and surprise recognition, improves from age 3 to 7 years; and (d) children's ability to recognize pride cannot be accounted for by the use of a process of elimination (i.e., an exclusion rule) to identify an unknown entity. These findings have implications for the development of emotion recognition and children's ability to perceive and communicate pride.     

Acute nicotine withdrawal symptoms and anxious responding to bodily sensations: a test of incremental predictive validity among young adult regular smokers

Although previous work has found associations between panic and smoking, little research has investigated potential mechanisms by which smoking may contribute to panic problems. The present investigation evaluated the incremental validity of acute nicotine withdrawal symptoms (elicited by an average of 2 h of nicotine deprivation) relative to negative affectivity, anxiety sensitivity, and nicotine dependence in predicting anxiety responding to 3-min voluntary hyperventilation. The sample consisted of 90 regular smokers (46 females), as defined by smoking 10 cigarettes per day for at least 1 year, recruited through the general community. Consistent with prediction, greater levels of pre-challenge nicotine withdrawal symptoms uniquely predicted post-challenge intensity of panic symptoms and anxiety relative to other established factors. Findings are discussed in the context of how regular smoking may promote panic symptomotology.     

A public/private partnership in offering relationship education to the Norwegian population

This article is an overview of the relationship education field in Norway. We explain the roles of the national authorities and private organizations in education, and analyze achievements and challenges in the field. Involvement and economic support from the national authorities have made relationship education available to large groups of the population, though the characteristics of those who choose to attend are largely unknown. To ensure recruitment of those most in need of education, new strategies based on systematic information on barriers among different groups of the population must be developed. A variety of relationship education programs are offered by public and private organizations, with the U.S.-developed Prevention and Relationship Enhancement Program (PREP) being the most widespread. We present preliminary data of an effectiveness evaluation of PREP workshops in Norway. In general, participants evaluate the workshops positively. It is important to tailor relationship education to fit the various customs, beliefs, and challenges of couples attending programs.     

Hope against the cold: individual differences in trait hope and acute pain tolerance on the cold pressor task

Hope theory (see Snyder, 1994) is presented as a useful framework for understanding reactions to pain. In Study 1, persons scoring higher on the trait Hope Scale (Snyder, Harris et al., 1991) kept their hands in the freezing water (of a cold pressor task) for significantly longer. In Study 2, the higher-hope males, and not females, as measured by both trait and state hope (Snyder, Sympson et al., 1996), recognized the onset of the pain threshold significantly later. Moreover, in Study 2, results showed that individual differences measures of optimism, self-efficacy, depression, and positive and negative affects did not relate to the pain onset and tolerance variables. The implications of hope as related to the pain process and related research are discussed.