When Effort Is Enjoyed: Two Studies of Intrinsic Motivation for Personally Salient Activities

Distinctions between two philosophical conceptions of happiness, hedonism and eudaimonism, were applied to the study of intrinsic motivation. Modified versions of the Personally Expressive Activities Questionnaire (PEAQ) were used in two studies to contrast activities, all of which were enjoyed, but which differed in the level of effort involved. In Study 1, 173 college students were free to choose any type of activity that met the selection criteria. In Study 2, the activities chosen by 95 undergraduates were limited to activities associated with a particular leisure time or hobby activity in which the respondents engaged on a regular basis. Consistent results across the two studies indicate that High Effort–Liked activities, in comparison to Low Effort–Liked activities, were associated with greater interest, flow, and feelings of personal expressiveness, greater perceived competence, and higher scores for both self-realization values and importance. These differences are discussed for their implications for the conceptual understanding of intrinsic motivation.     

Anger and denial as predictors of cardiovascular reactivity in women

The relationship between behavioral and physiological reactivity and cardiovascular disease has been extensively researched in men, indicating that the expression of anger may be a contributory factor in the development of coronary heart disease. Few studies, however, have focused on women. Among these, women generally have been found to be less reactive to laboratory tasks than men. In the present study, 45 women aged 19–21 years were selected to represent three groups—(1) low anger/low denial, (2) high anger/low denial, and (3) low anger/high denial—based on their scores on the State-Trait Anger Expression Inventory and the Marlowe-Crowne Social Desirability Scale. Subjects received three conditions: (1) no feedback, (2) error feedback without observer present, and (3) error feedback with observer present. As hypothesized, women who reported a high level of denial and low anger exhibited elevated stress-related reactivity. The results are suggestive of a subgroup of highly reactive women not previously identified within the literature. The hypothesis that all groups would display greater reactivity in a condition providing error feedback with observation was not supported.This study was supported by a research grant to Carol S. Emerson from the Women's Research Institute of Virginia.     

小剂量酒精伤害驾驶行为的时序效应

酒后开车普遍存在并致交通肇事居高不下的现实,对法定酒精限量的科学性提出质疑.本实验在多数国家交通法规采用的体内血液酒精水平BAL＜0.5‰的标准以下,设计三项任务对12名被试在酒前酒后四段时间内的行为实施测试,结果表明个体无法准确估计安全的酒精摄入量;小剂量酒精仍具有伤害行为的效应;酒精影响依行为复杂程度呈现时序效应.     

Guiding drivers towards safer driving speed: Exploiting visual dominance in speed adaptation

Inappropriate speed is a main cause of accidents. Drivers are often unaware of potential risks due to inadequate speed. To prevent dangerous situations, we need to understand perceptual factors influencing human speed perception. Due to the prominent role of vision in driving, we examined the effect of visuo-spatial stimuli on speed based on the optic flow. While developing an adaptive infrastructure measure to reduce speed, we conducted two consecutive studies, a driving simulator study and a field test to investigate findings further. In both studies, we placed lights on two sides of a highway exit and either illuminated them statically or activated them in a way that they appeared to be moving towards the driver. We expected drivers to slow down more when seeing static light stimuli compared to a baseline without lights. We also expected drivers to decrease speed more in conditions with oncoming lights compared to a baseline, and to static lights, due to distorted speed perception. The first study in a static driving simulator revealed no difference between conditions. In the field test, both static lights and lights moving towards the driver led to a speed reduction compared to a baseline but did not differ from one another. Lights in general led to lower driving speed, potentially due to their warning character, but we found no difference between the light conditions, suggesting that the effect might not be based on the optic flow. Future research should investigate the relationship between driven and perceived speed more closely.     

餐后低血压的原发高血压患者24h动态血压特点

为了分析餐后低血压（PPH）患者的24h 动态血压变化特点,选择150例原发性高血压患者进行24h 动态血压监测,分成 PPH 组（n＝85）和非 PPH（n＝65）。观察两组平均血压、血压负荷值、晨峰值、血压变异性等指标。结果显示,（1） PPH 组年龄明显高于非 PPH 组（P＜0．05）;（2）PPH 组患者24h 及日间、夜间平均收缩压及平均收缩压负荷高于非PPH 组（P＜0．05）,但舒张压无统计学差异（P＞0．05）;（3） PPH 组患者血压变异性明显高于非 PPH 组（P ＜0．05）;（4） PPH 组患者血压晨峰数值及晨峰发生率明显高于非 PPH 组（P＜0．05）;（5） PPH 组夜间血压下降率及非勺型率较非 PPH 组无统计学差异（P＞0．05）。因此,PPH 患者易发生于高龄患者,且具有收缩压、血压变异性增高,更易发生晨峰现象的特点。     

红细胞体积分布宽度与冠心病关系的研究近况

红细胞体积分布宽度是血常规检测报告的一部分,临床多用于各种贫血的诊断与鉴别诊断。近年国内外研究显示,其测量值的增高与冠心病的死亡等不良事件发生风险增加密切相关。本文对其生物学特性与检测原理、与冠心病关系、测量值的增高预测冠心病不良预后的可能机制的研究进行综述。     

To pass or not to pass: More a question of body orientation than visual cues

This study investigated the influence of pitch body tilt on judging the possibility of passing under high obstacles in the presence of an illusory horizontal self-motion. Seated subjects tilted at various body orientations were asked to estimate the possibility of passing under a projected bar (i.e., a parking barrier), while imagining a forward whole-body displacement normal to gravity. This task was performed under two visual conditions, providing either no visual surroundings or a translational horizontal optic flow that stopped just before the barrier appeared. The results showed a main overestimation of the possibility of passing under the bar in both cases and most importantly revealed a strong influence of body orientation despite the visual specification of horizontal self-motion by optic flow (i.e., both visual conditions yielded a comparable body tilt effect). Specifically, the subjective passability was proportionally deviated towards the body tilt by 46% of its magnitude when facing a horizontal optic flow and 43% without visual surroundings. This suggests that the egocentric attraction exerted by body tilt when referring the subjective passability to horizontal self-motion still persists even when anchoring horizontally related visual cues are displayed. These findings are discussed in terms of interaction between spatial references. The link between the reliability of available sensory inputs and the weight attributed to each reference is also addressed.     

Mobility of c dislocations in Ti3, Al

Abstract

The rôle of dislocations with Burgers vectors, b, given by b = [0001] during deformation of samples of the intermetallic compound Ti₃Al has been assessed. At room temperature, the experimental evidence is consistent with these dislocations being sessile, their density and morphology being similar to that in undeformed samples. In samples deformed at 650°C and above, it is concluded that motion of these dislocations is effected by dislocation climb. The line directions of the various segments of dislocations with b= [0001] are shown to be perpendicular to planes that contain sheets of Ti atoms, with an expected tendency to exhibit a high Peierls stress.     

Control of Gait Initiation

The initiation of gait from a standing posture by 6 subjects, who took controlled-length steps, was analyzed. Using an inverted-pendulum model, we found that the duration of gait initiation was independent of gait velocity. This finding suggests that subjects' biomechanical constants are the determining factors for initiating movement. Both the instantaneous velocity of the center of gravity at the end of the first step (resulting in the propulsive forces measured on the ground) and the steady-state velocity (resulting in the step length and frequency) varied with step length, whereas step frequency did not. But step frequency and progression velocity were linked, for step frequency always increased in parallel with increased progression velocity. We interpret the correlation between velocity and frequency variations to be a peripheral expression of the posturodynamic control of the step parameters by the progression forces.     

Differential hemodynamic effects during the provision of active and passive support in the laboratory

Objective: Recent research has pointed to the cardiovascular benefits of providing social support to others in times of stress; however, little is known about what factors influence such benefits.

Design and measures: In a between-groups design, we investigated the possible interaction between intimacy (friend vs. stranger) and support type (active vs. passive) in determining the cardiovascular responses of support providers. Eighty participants had their blood pressure and heart rate monitored while providing either active or passive social support to a friend or a stranger who completed a stress task.

Results: Although there was no interaction effect, a significant main effect showed that those who provided passive support showed larger decreases relative to those in the active support condition. There was no effect of intimacy. Further, these effects withstood adjustment for a number of potential confounds (e.g. sex and body mass index).

Conclusion: It appears that the greatest physiological benefit for social support providers may come from providing passive, rather than active support, regardless of whether the support receiver is a friend or a stranger.