Vagueness-Adaptive Logic: A Pragmatical Approach to Sorites Paradoxes

Kripke-completeness of every classical modal logic with Sahlqvist formulas is one of the basic general results on completeness of classical modal logics. This paper shows a Sahlqvist theorem for modal logic over the relevant logic Bin terms of Routley-Meyer semantics. It is shown that usual Sahlqvist theorem for classical modal logics can be obtained as a special case of our theorem.     

The Role of Separation Anxiety in Mothers’ Use of Autonomy Support: An Observational Study

Parental separation anxiety has been identified as a detrimental factor for parent-adolescent relationship quality and, ultimately, for adolescents’ psychosocial adjustment. However, few studies have examined how separation anxiety is related to parents’ style of interaction with their adolescent, which is unfortunate as this interaction style could explain why separation anxiety is related to negative outcomes. The present study (a) examined the association between maternal separation anxiety and mothers’ autonomy-supportive, relative to controlling, conversation style as observed in mother-adolescent interactions about the adolescents’ friendships, and (b) investigated the link between maternal separation anxiety and mothers’ personal experiences during the conversation. A total of 62 mother–adolescent dyads (M age mothers?=?44 years, M age adolescents?=?14 years) were willing to participate in this study. After mothers filled out a measure of separation anxiety, mothers’ autonomy-supportive and controlling practices were observed and coded during a 10-min conversation. Further, mothers reported on their emotional and motivational experiences during the conversation. Mothers high on separation anxiety were observed to be less autonomy-supportive and to experience the conversation as more stressful (e.g., more pressure, more tension, and more relief at the end). Clinically, our results suggest that maternal separation anxiety is an important target for intervention and prevention efforts aimed at promoting autonomy-supportive parenting.     

Exercise training can improve spatial characteristics of time-critical obstacle avoidance in elderly people

Fall prevention programs have rarely been evaluated by quantitative movement analysis methods. Quantitative movement analyses could provide insight into the mechanisms underlying the effects of training. A treadmill obstacle avoidance task under time pressure has recently been used to evaluate a fall prevention exercise program for community-dwelling elderly people and it showed that participants improved their obstacle avoidance success rates. The mechanism, by which the increased success rates were achieved, however, remained to be determined. Participants were elderly who had fallen at least once in the year prior to participation. They were assigned to either the exercise or the control group. The control group did not receive any specific treatment. The exercise group was administered a five week exercise program, which consisted of exercises on a functionally oriented obstacle course, walking exercises, and practice of fall techniques. Pre- and post-intervention laboratory obstacle avoidance tests were conducted. Three possible determinants of success were investigated, namely avoidance reaction times, the distribution of avoidance strategies, and three spatial parameters (toe distance, foot clearance and heel distance). Analysis yielded significant TimexGroup interactions in heel distances. The exercise group increased heel distance, while the control group did not. Increased heel distance may result in reduced risk of heel contact with the obstacle and, consequently, larger success rates. The remaining parameters showed no effect of training. In conclusion, the training program was effective in improving time-critical obstacle avoidance skills. In every day life, these effects of training may contribute to less obstacle-related fall incidents in elderly. In addition, these findings could indicate that the execution of other time-critical events, like an actual fall, could also be improved by training.     

Right‐Wing Authoritarianism: Protective Factor Against or Risk Factor for Depression?

Because the authoritarian personality was introduced to explain the rise of fascism during World War II, research focused on its ability to predict prejudice, leaving its associations with well‐being largely unexplored. Studies that did examine these associations yielded inconsistent results, and some authors even argued that authoritarianism buffers against the negative effects of psychological vulnerability factors (i.e. D‐type personality) and negative life events on well‐being, especially among people in an authoritarian environment. Using a cross‐sectional community sample (N = 1010), Study 1 failed to support the idea that authoritarianism relates to depressive symptoms and buffers against the negative effects of D‐type personality on depressive symptoms. Using a longitudinal college student sample (N = 499), Study 2 showed that authoritarianism did not moderate the effects of life events either and even predicted over‐time increases in depressive symptoms. Using a longitudinal high school sample (N = 590), Study 3 showed that this effect emerged regardless of degree of fit with the social environment (i.e. with family and friends). Taken together, results suggest that authoritarianism constitutes a risk factor for rather than a protective factor against depressive symptoms. Copyright © 2011 John Wiley & Sons, Ltd.