Simple Threshold Rules Solve Explore/Exploit Trade-offs in a Resource Accumulation Search Task

How, and how well, do people switch between exploration and exploitation to search for and accumulate resources? We study the decision processes underlying such exploration/exploitation trade-offs using a novel card selection task that captures the common situation of searching among multiple resources (e.g., jobs) that can be exploited without depleting. With experience, participants learn to switch appropriately between exploration and exploitation and approach optimal performance. We model participants' behavior on this task with random, threshold, and sampling strategies, and find that a linear decreasing threshold rule best fits participants' results. Further evidence that participants use decreasing threshold-based strategies comes from reaction time differences between exploration and exploitation; however, participants themselves report non-decreasing thresholds. Decreasing threshold strategies that “front-load” exploration and switch quickly to exploitation are particularly effective in resource accumulation tasks, in contrast to optimal stopping problems like the Secretary Problem requiring longer exploration.     

脱贫内生动力机制的质性探究

内生动力是世代贫困个体得以脱贫的核心心理资源。当前, 对脱贫的内生动力仍然缺乏系统性的解释框架。文章以脱贫的内生动力为切入点, 基于内生和外生融合性视角, 采用基于深度访谈的扎根理论方法, 运用强度抽样的策略, 以海南岛某深度贫困村的成功脱贫个体(7人)、世代贫困个体(10人)及扶贫干部(4人)为研究对象, 构建出世代贫困家庭的整体内生动力资源枯竭模型。研究表明：1)以消极的价值观、消极的自我观和被动脱贫的行为倾向为主体的“三因素洋葱模型”是世代贫困个体的消极内在驱动力; 2)作为社会心理动力的控制感缺失是引致世代贫困个体内生动力匮乏的重要诱因, 而贫困个体缺少市场理性及扶贫的运动式治理可能是导致控制感缺失的外部肇因; 3)家长亲职能力在家庭内部建设能力培植子代内生动力的过程中起着中间作用, 即家庭内部建设能力可促进家长亲职能力的提高, 进而激发子代脱贫的内生动力。     

Mental fatigue influence on effort-related cardiovascular response: difficulty effects and extension across cognitive performance domains

Two experiments investigated cardiovascular effects of mental fatigue as a function of (1) the difficulty of the cognitive challenge with which participants were confronted, and (2) the relevance of that challenge to the activity that instigated the fatigue. In the first, participants performed an easy (fatigue low) or difficult (fatigue high) counting task and then were presented an arithmetic challenge (task B relevance high) or a scanning challenge (task B relevance low) with instructions that they would avoid a noise if they attained a modest performance standard. Analysis of blood pressure responses assessed during the work periods revealed fatigue main effects, reflecting stronger responses for High Fatigue participants, regardless of the character of the second task. In the second, the procedure was the same except that it included a high performance standard and provided the chance to win a prize. Analysis of the pressure data revealed fatigue x work period interactions, reflecting relatively stronger responses among High Fatigue participants in work period 1, but relatively weaker responses among these participants in work period 2. Results confirm previous findings and support an analysis of fatigue influence on effort and associated cardiovascular responses. They also argue against the idea that mental fatigue influence may be confined to relevant cognitive performance realms.

The Strength Model of Self-Control

ABSTRACT— Self-control is a central function of the self and an important key to success in life. The exertion of self-control appears to depend on a limited resource. Just as a muscle gets tired from exertion, acts of self-control cause short-term impairments (ego depletion) in subsequent self-control, even on unrelated tasks. Research has supported the strength model in the domains of eating, drinking, spending, sexuality, intelligent thought, making choices, and interpersonal behavior. Motivational or framing factors can temporarily block the deleterious effects of being in a state of ego depletion. Blood glucose is an important component of the energy.     

Violence restrained: Effects of self-regulation and its depletion on aggression

Aggressive impulses arise from many factors, but they are usually held in check by social norms for self-control. Thus, the proximal cause of aggression is often failure of self-restraint. In five studies, depleted capacity for self-regulation (caused by prior, even irrelevant acts of self-regulation) increased aggressive responding, especially after an insulting provocation. When participants were insulted and their self-regulatory strength was depleted (i.e., after completing previous tasks that required self-regulation), participants were more likely to aggress. When the urge to aggress was relatively weaker (i.e., when participants were not insulted), self-regulatory depletion did not increase aggressive behavior. This effect was moderated by trait self-control: Participants low in trait self-control were particularly likely to express intentions of behaving aggressively in response to provocation, whereas participants high in trait self-control did not express intentions of responding aggressively. Laboratory, autobiographical memory, and hypothetical responses confirmed the pattern.     

And deplete us not into temptation: Automatic attitudes, dietary restraint, and self-regulatory resources as determinants of eating behavior

Linking contemporary models of self-regulation to recent research on automatic attitudes, the present study investigated the impact of automatic candy attitudes, dietary restraint standards, and self-regulation resources on eating behavior. Participants were assigned to either an emotion suppression task (low self-regulation resources) or an emotion flow task (high self-regulation resources), and were then given an opportunity to taste candies. When self-regulation resources were high, candy consumption was uniquely related to dietary restraint standards (but not automatic candy attitudes). In contrast, when self-regulation resources were low, candy consumption was primarily predicted by automatic candy attitudes, with dietary restraint standards showing a tendency for counterintentional effects. These results indicate that the behavioral impact of automatic attitudes and personal standards depends on available control resources. Implications for research on automatic attitudes and self-regulation are discussed.     

Action orientation overcomes the ego depletion effect

It has been consistently demonstrated that initial exertion of self‐control had negative influence on people's performance on subsequent self‐control tasks. This phenomenon is referred to as the ego depletion effect. Based on action control theory, the current research investigated whether the ego depletion effect could be moderated by individuals' action versus state orientation. Our results showed that only state‐oriented individuals exhibited ego depletion. For individuals with action orientation, however, their performance was not influenced by initial exertion of self‐control. The beneficial effect of action orientation against ego depletion in our experiment results from its facilitation for adapting to the depleting task.     

A depleted mind feels inefficacious: Ego‐depletion reduces self‐efficacy to exert further self‐control

Recent research has found that ego‐depletion undermines self‐control by motivating cognition that justifies conservation of mental resource. One potential cognitive mechanism is reduction of self‐efficacy. Specifically, we propose that ego‐depletion might demotivate self‐control by making people believe that they are inefficacious in exerting self‐control in subsequent tasks. Three experiments support the proposal. First, we demonstrated that (a) ego‐depletion can reduce self‐efficacy to exert further control (Experiments 1 to 3) and (b) the temporary reduction of self‐efficacy mediates the effect of depletion on self‐control performance (Experiment 2). Finally, we found that (c) these effects are only observed among participants who endorse a limited (versus non‐limited) theory of willpower and are, hence, more motivated to conserve mental resources (Experiment 3). Taken together, the present findings show that decrease in self‐efficacy to exert further self‐control is an important cognitive process that explains how ego‐depletion demotivates self‐control. This research also contributes to the recent discussion of the psychological processes underlying ego‐depletion.     

Affective commitment as a moderator of the adverse relationships between day-specific self-control demands and psychological well-being

Recent research has focused on the day-specific adverse effects of stressors at work. Thus, in the present study, we examine the relationships between day-specific work-related self-control demands (SCDs) as a stressor and day-specific indicators of psychological well-being (ego depletion, need for recovery, and work engagement). On the basis of the limited strength model of self-control, we predict that SCDs deplete limited regulatory resources and impair psychological well-being. Furthermore, we propose affective commitment as a buffering moderator of this relationship. Consistent with the broaden and build theory of positive emotions and the self-determination theory, we suggest that affective commitment satisfies employees basic psychological needs and provides positive emotions, which, in turn, help restore limited regulatory resources. Thus, affective commitment should buffer the negative relationships between day-specific SCDs and day-specific psychological well-being. To examine our hypotheses, we conducted a diary study with N = 60 employees over 10 working days and used multi-level models to test our predictions. Our results demonstrated that day-specific SCDs indeed impaired indicators of psychological well-being. Furthermore, affective commitment buffered these adverse relationships; thus, on days with high SCDs, highly committed employees reported higher levels of psychological well-being than did less committed employees.