Differential effects of assisted cycling therapy on short-term and working memory of adolescents with Down syndrome

Persons with Down syndrome (DS) suffer from prefrontal cortex dysfunction and deficits in executive functions. The current study examined the effects assisted cycling therapy (ACT) on short-term (STM) and working memory (WM) in adolescents with DS. During ACT, the cadence of participants on a stationary bicycle was augmented with an electrical motor to 180% of the voluntary cadence. Participants completed eight weeks of ACT (n?=?17), eight weeks of voluntary cycling (VC) at their own preferred cadence (n?=?16), or eight weeks of no cycling (np?≥?.149) and working memory improved only in the ACT group (Hedge’s g?=?1.66; p?=?.003). The results indicate that assisted high-cadence cycling (i.e. ACT) produces superior neural benefits in the dorsolateral prefrontal cortex compared to VC.     

The Illusion of Double‐Discount: Using Reference Points in Promotion Framing

Double‐discount is an effective format for promoting purchase decisions. However, extant literature has overlooked how temporal order of discounts applied affects consumers’ purchase decisions. In this paper, we show that the sequence of discount magnitude (e.g., 10% followed by 40% vs. 40% followed by 10%) leads to biases in consumer judgment and influences the perceived appeal and purchase intention of the deal. We term this the double‐discount sequence effect. Using four experiments, we showed that double‐discount in an ascending sequence (e.g., taking 10% off, then an additional 40% off) is preferable over that in a descending sequence. We also found that discount application sequence—but not the presentation order—matters to consumers. Consumers anchor on the first discount they encounter and evaluate the second discount with respect to this first one.     

The time course effect of moderate intensity exercise on response execution and response inhibition

This research aimed to investigate the time course effect of a moderate steady-state exercise session on response execution and response inhibition using a stop-task paradigm. Ten participants performed a stop-signal task whilst cycling at a carefully controlled workload intensity (40% of maximal aerobic power), immediately following exercise and 30 min after exercise cessation. Results showed that moderate exercise enhances a subjects’ ability to execute responses under time pressure (shorter Go reaction time, RT without a change in accuracy) but also enhances a subjects’ ability to withhold ongoing motor responses (shorter stop-signal RT). The present outcomes reveal that the beneficial effect of exercise is neither limited to motor response tasks, nor to cognitive tasks performed during exercise. Beneficial effects of exercise remain present on both response execution and response inhibition performance for up to 52 min after exercise cessation.     

决策过程中参照点效应研究述评

Kahneman和Tversky提出的“参照点效应”概念,对决策者的认知编码和信息整合方式做出了合理的解释,并对传统的理性决策理论提出了挑战。近年来,关于参照点效应的研究也一直受到众多学者的重视。文章系统阐述了参照点效应的相关概念和最新研究进展,并提出了参照点效应未来研究的4个趋势：日益重视多重参照点效应的研究、开始关注动态决策中的参照点变化机制、重视群体决策过程中的参照点效应研究、注重在现实决策任务中验证和发展参照点效应的相关理论     

The Influence of Perceived Versus Aerobic Fitness on Psychological Health and Physiological Stress Responsivity

This study sought to evaluate the association between perceived and aerobic physical fitness and both psychological functioning and physiological stress responsivity. Sixty nonsymptomatic participants (30 males, 30 females) participated in the experiment. Participants completed a series of personality and mood questionnaires as well as a laboratory procedure measuring cardiovascular responses (i.e., heart rate and blood pressure) while performing stressful laboratory tasks (i.e., the Stroop Color Naming Test and a sham IQ test). Aerobic fitness (i.e., VO ₂ max using the Bruce protocol) as well as perceived fitness were also determined. Results suggest that perceived fitness was generally associated with positive personality and mood variables while aerobic fitness was not. Overall results support the view that perception of fitness may be as important or perhaps even more important than aerobic fitness in its association with psychological but perhaps not physical functioning.     

Testing the reference-dependent model: an experiment on asymmetrically dominated reference points

Standard choice theory assumes choice to be independent of the point of reference. Based on a number of studies which challenge this assumption, Tversky and Kahneman have proposed a reference-dependent model which captures the influence of reference points on individual choice. If choice is reference-dependent, switching the reference point so that it is first dominated by x and then by y increases the likelihood of choosing y. Switching the location of an asymmetrically dominated reference point without altering the dominance relationship should also influence reference-dependent choice in a predicted manner. In this paper the reference-dependent model is tested in two experiments which focus on asymmetrically dominated reference points. The results of these experiments give further confirmation to the reference-dependent model. © 1998 John Wiley & Sons, Ltd.     

The Effects of Tai Chi Chuan Relaxation and Exercise on Stress Responses and Well-Being: An Overview of Research

The rationale of this article is to review, analyze, and discuss studies concerning the role of Tai Chi in stress management and well-being, linking those studies to research on exercise, yoga, and relaxation with regard to physiological and psychological wellness. All studies reported in PsychLit and Medline between 1996 and 1999 directly related to the subject, plus other studies relevant for the analysis, are addressed in this review. Studies reviewed in this article characterize Tai Chi as a form of moderate exercise. Although Tai Chi may not be suitable for achieving aerobic fitness, it may enhance flexibility and overall psychological well-being. Cognitively, there are indications that Tai Chi exercise may lead to improvements in mood. However, it is not clear whether the positive effects of Tai Chi are due solely to its relaxation and meditation component, or whether they are the consequence of various peripheral factors, since it is known that stress reduction often occurs when we indulge in activities we find pleasurable and satisfying. An important finding is that all studies on the benefits of Tai Chi for senior adults have revealed positive results.     

A global optimization approach for generating efficient points for multiobjective concave fractional programs

In this article, we present a global optimization approach for generating efficient points for multiobjective concave fractional programming problems. The main work of the approach involves solving an instance of a concave multiplicative fractional program (W̄). Problem (W̄) is a global optimization problem for which no known algorithms are available. Therefore, to render the approach practical, we develop and validate a branch and bound algorithm for globally solving problem (W̄). To illustrate the performance of the global optimization approach, we use it to generate efficient points for a sample multiobjective concave fractional program. Copyright © 2006 John Wiley & Sons, Ltd.