Do not prime hawks with doves: The interplay of construct activation and consistency of social value orientation on cooperative behavior.

Low and high consistent pro-socials and pro-selfs were primed with neutral, morality, or might concepts in mixed-motive situations. The authors expected participants' social value orientation to influence cooperative behavior among (a) high consistent individuals in all prime conditions and (b) low consistent individuals in the neutral prime condition only. The authors also expected the primes to influence cooperative behavior more among low than high consistent individuals. Four experiments using supraliminal (Experiments 1, 2, and 4) or subliminal (Experiment 3) priming and 2-person (Experiments 1-3) or N-person (Experiment 4) social dilemmas partially supported these initial predictions. One intriguing exception was that morality primes reduced cooperation among high consistent pro-selfs. Experiments 2-4 allowed testing for the potential role of expectations in shaping participants' cooperative behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Recommended restrictions after 131I therapy: measured doses in family members

Previous studies have shown that levels of plasma brain natriuretic peptide (BNP) increase in an early phase of acute myocardial infarction. However, the relations between plasma BNP levels and left ventricular remodelling, which occurs long after acute myocardial infarction, are not fully understood. Venous plasma BNP levels were measured 2, 7, 14, 30, 90 and 180 days after the onset of acute myocardial infarction in 21 patients. Left ventricular end-diastolic volume index (EDVI, ml/m2) in acute (5 days) and chronic (6 months) phases were assessed by electron-beam computed tomography using Simpson's method. The remodelling group (n=9) was defined by an increase in EDVI >/=5 ml/m2 relative to the baseline value. Plasma BNP levels on days 2, 7, 14, 30 and 90 were significantly higher in the remodelling group than in the non-remodelling group (n=12, P<0.05). Sustained elevation of plasma BNP levels was noted from day 2 (61+/-12 pmol/l) to day 90 (55+/-12 pmol/l) and significantly decreased on day 180 (24+/-3 pmol/l) in the remodelling group. In contrast, plasma BNP levels significantly decreased from day 2 (25+/-4 pmol/l) to day 90 (9+/-1 pmol/l) and reached a steady level thereafter in the non-remodelling group. Plasma BNP levels on day 7 correlated positively with an increase in EDVI (r=0.70, P<0.001) from the acute to chronic phase. More importantly, the sustained elevation of plasma BNP (percentage decrease smaller than 25%) from day 30 to day 90 identified patients in the remodelling group with a sensitivity of 100% and a specificity of 83%. In conclusion, not only the high levels of plasma BNP in an acute phase, but also the sustained elevation of plasma BNP in a chronic phase, may be associated with progressive ventricular remodelling occurring long after acute myocardial infarction.     

The role of interpersonal perceptions in the prime-to-behavior pathway.

The present research suggests that biased interpersonal perceptions can mediate prime-to-behavior effects and introduces a new moderator for when such mediation will occur. Across 5 experiments, the authors provide evidence that priming effects on behavior in interpersonal contexts are mediated by social perceptions, but only when participants are focused on the other person. These effects occur when other-focus is primed (Experiment 1), when other-focus is high owing to the decision-making situation (Experiment 2), and when other-focus is dispositionally high (Experiment 3). Experiments 4 and 5 bring additional support for a biased perception account by ruling out an alternative behavior-perception link and showing that other-focus can moderate not only the mediating mechanism of prime-to-behavior effects but also the behavioral effects themselves. The implications of these results for increasing understanding of behavioral priming effects in rich social contexts are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison between younger and older drivers of the effect of obstacle direction on the minimum obstacle distance to brake and avoid a motor vehicle accident

Our objectives were to determine the effects of age and direction of appearance of an obstacle on the minimum obstacle distance to brake and avoid a motor vehicle accident. Ten younger and 10 older drivers were tested in a custom-made driving simulator using an animation of a straight suburban road. Driving at 50 km/h, participants suddenly encountered pedestrians appearing at increasingly closer distances in front, from the left or from the right. They then had to brake as fast as possible and come to a complete stop before running over the pedestrian. Results showed that older drivers had 1.8 m greater minimum obstacle distance than younger drivers. This decreased ability with age appeared to be due to a decline in response initiation. Pedestrians appearing from the periphery also resulted in 2.1 m (left) and 2.8 m (right) greater minimum obstacle distance than those appearing directly in front. This decreased ability with obstacle direction appeared to be mostly due to declines in response initiation and response geometry. Finally, the difference with age was greater when pedestrians appeared from the right compared to the left or front. Therefore, it is important to include both temporal and geometrical performance measures in studies on motor vehicle accidents.     

Tokenism also works with groups as tokens: The impact of group openness and group qualification on reactions to membership in a low-status group.

Two experiments tested whether the tokenism effect would also emerge when groups as a whole rather than individual group members are denied access into a high-status group. In total, 317 pupils were led to believe that their class was not accepted into a high-status group. The openness of this high-status group toward other groups (open, minimally open, and closed) and the qualification of the own class (low, high) were manipulated. In both studies, pupils of a highly qualified class confronted with a closed high-status group differed from all other conditions by preferring nonnormative action to normative action. These results indicate that tokenism is a very robust phenomenon that occurs even when groups strongly expected to join the high-status group. (PsycINFO Database Record (c) 2010 APA, all rights reserved)