早期听觉剥夺后的大脑可塑性：来自先天性听力障碍群体的证据

皮层功能的正常发展依赖于充分的外部感觉信息的输入。先天性听力障碍群体由于经历早期听觉剥夺, 皮层功能往往出现异常。具体表现为初级听皮层功能退化, 初级、次级听皮层的功能连接变弱, 次级听皮层出现跨通道功能重组; 在后天听力重建后听皮层功能重组仍然存在, 言语加工需要更多高级认知资源的补偿。已有研究在探讨听力重建后皮层的长期可塑性机制、复杂声学环境下言语加工机制、汉语言加工独特性等方面尚不深入, 值得进一步研究。     

Interactions between the effects of food and water motivating operations on food‐ and water‐reinforced responding in mice

Two experiments examined interactions between the effects of food and water motivating operations (MOs) on the food‐ and water‐reinforced operant behavior of mice. In Experiment 1, mice responded for sucrose pellets and then water reinforcement under four different MOs: food deprivation, water deprivation, concurrent food and water deprivation, and no deprivation. The most responding for pellets occurred under food deprivation and the most responding for water occurred under water deprivation. Concurrent food and water deprivation decreased responding for both reinforcers. Nevertheless, water deprivation alone increased pellet‐reinforced responding and food deprivation alone likewise increased water‐reinforced responding relative to no deprivation. Experiment 2 demonstrated that presession food during concurrent food and water deprivation increased in‐session responding for water relative to sessions where no presession food was provided. Conversely, presession water during concurrent food and water deprivation did not increase in‐session responding for pellets. These results suggest that a) the reinforcing value of a single stimulus can be affected by multiple MOs, b) a single MO can affect the reinforcing value of multiple stimuli, and c) reinforcing events can also function as MOs. We consider implications for theory and practice and suggest strategies for further basic research on MOs.     

Effects of sleep deprivation on executive functioning,cognitive abilities,metacognitive confidence,and decision making

Performance on many decision‐making tasks is underpinned by metacognitive monitoring, cognitive abilities, and executive functioning. Fatigue‐inducing conditions, such as sleep loss, compromise these factors, leading to decline in decision performance. Using a 40‐hr sleep deprivation protocol, we examined these factors and the resulting decision performance. Thirteen Australian Army male volunteers (aged 20–30 years) were tested at multiple time points on psychomotor vigilance, inhibitory control, task switching, working memory, short‐term memory, fluid intelligence, and decision accuracy and confidence in a medical diagnosis‐making test. Assessment took place in the morning and night over two consecutive days, during which participants were kept awake. Consistent with previous work, cognitive performance declined after a night without sleep. Extending previous findings, self‐regulation and self‐monitoring suffered significantly greater declines immediately after the sleepless night. These results indicate that the known decline in complex decision‐making performance under fatigue‐inducing conditions might be facilitated by metacognitive rather than cognitive mechanisms.     

青少年学生焦虑敏感与睡眠质量的关系及其内在机制

采用中学生、大学生焦虑敏感问卷和匹兹堡睡眠质量指数量表(PSQI),分别对1011名中学生和607名大学生进行调查。结果显示高焦虑敏感学生的PSQI总分显著高于低焦虑敏感学生,焦虑敏感及其三个因子与PSQI的相关都是中效应,焦虑敏感对青少年学生睡眠质量指数具有显著的正向预测作用,焦虑敏感水平越高,其睡眠质量越差。焦虑敏感可能以应激事件和健康问题作为致敏源,以焦虑等负性情绪作为敏感内容,在消极自动认知觉察与思维的介入下,进一步放大对有关负性情绪的感受与体验,从而影响青少年学生的睡眠质量。     

Anger, Fear, or Sadness: Faculty Members' Emotional Reactions to Collective Pay Disadvantage

As part of a mail survey about their work experiences, university faculty members reported their specific emotional reactions to group inequities in faculty pay and benefits. The results indicate that sadness, fear, and anger are distinct emotional responses to a collective disadvantage. Group-based anger mediated the relationship between collective disadvantage and willingness to protest whereas group-based sadness mediated the relationship between collective disadvantage and organizational loyalty. Based on an integration of cognitive appraisal models of emotion with RD theory, four other predictors of intergroup emotions—(1) the legitimacy of the process that produced the deprivation, (2) whether another agent was responsible, (3) group efficacy, and (4) whether the situation would improve or become worse—were identified and tested. The measurement of specific emotional reactions to perceived collective disadvantage extends and refines RD approaches to collective action and organizational loyalty.     

Money does not bring well‐being,but it does help! The relationship between financial resources and life satisfaction of the chronically ill mediated by social deprivation and loneliness

Chronically ill people have lower incomes and higher illness‐related costs than the general population. Therefore, their financial situation can be considered vulnerable, like their health. The aims of this study were (1) to assess the strength of the relationship between financial resources and life satisfaction of patients with chronic physical illness and (2) to investigate the mediating roles of social deprivation and loneliness in this relationship. Data were used of 1265 patients diagnosed with one or more somatic chronic disease(s), aged 25 years and older, who were recruited from 56 general practices in The Netherlands. GPs provided data on diagnoses and illness duration; chronically ill patients provided data on their functional status, financial situation, social deprivation, loneliness and life satisfaction. Data were analysed by means of correlation and linear regression analyses as well as LISREL path analysis. Available income correlates 0.13 with life satisfaction, which is similar to correlations found in general Western populations. The effect of available income on life satisfaction is mainly an indirect effect that can be explained by the mediating roles of social deprivation and loneliness. Policy should pay specific attention to income support of the chronically ill and disabled in order to improve their opportunities for social participation and increase the quality of their life. Copyright © 2007 John Wiley & Sons, Ltd.     

Sleep-related improvements in motor learning following mental practice

A wide range of experimental studies have provided evidence that a night of sleep may enhance motor performance following physical practice (PP), but little is known, however, about its effect after motor imagery (MI). Using an explicitly learned pointing task paradigm, thirty participants were assigned to one of three groups that differed in the training method (PP, MI, and control groups). The physical performance was measured before training (pre-test), as well as before (post-test 1) and after a night of sleep (post-test 2). The time taken to complete the pointing tasks, the number of errors and the kinematic trajectories were the dependent variables. As expected, both the PP and the MI groups improved their performance during the post-test 1. The MI group was further found to enhance motor performance after sleep, hence suggesting that sleep-related effects are effective following mental practice. Such findings highlight the reliability of MI in learning process, which is thought consolidated when associated with sleep.     

Self-Reported Symptoms of Depression by Changes in Sleeping Patterns and Appetites for Outpatients with a Major Depressive Disorder

To determine whether self-reported symptoms of depression are differentiated by changes in sleeping patterns or appetite, the Beck Depression Inventory-II (BDI-II; Beck et al. 1996) was administered to 1,250 outpatients diagnosed with a major depressive disorder. A series of focused contrasts supported the hypothesis that the mean BDI-II total scores and the majority of the symptom ratings of the outpatients who described increases or decreases in their sleeping patterns or appetites were comparable and higher than the mean BDI-II total scores and symptom ratings of the patients who reported no changes in their sleeping patterns or appetites. However, the patients who were sleeping less described themselves as being more agitated than those who were sleeping more. Decreases and increases in sleep or appetite were both discussed as indicating comparable levels of depressive symptomatology.

Food deprivation: Effects on the predatory behavior of southern grasshopper mice (Onychomys torridus)

The southern grasshopper mouse (Onychomys torridus) is a predatory and aggressive rodent native to the semi-arid scrub deserts of the southwestern United States and northern Mexico. Its natural diet consists primarily of arthropods and small vertebrates. In this study, we have evaluated the effects of food deprivation on the predatory behavior of adult male and female grasshopper mice to crickets (Acheta domesticus) and laboratory mice (Mus musculus). Subjects that were food-deprived for 48 hours spent more time eating dead but not living crickets than did controls that were provided free access to laboratory chow. There were no sex differences in the predatory behavior of grasshopper mice to living or dead crickets. Food deprivation also influenced the predatory behavior of grasshopper mice toward laboratory mice. With laboratory chow available ad lib, 6 of 43 (14%) male and 22 of 45 (49%) female grasshopper mice killed and ate laboratory mice within 48 hours of pairing. When deprived of food for 48 hours, 16 of 36 (44%) males and 15 of 19 (79%) females that did not kill in the previous experiment killed and ate laboratory mice. We concluded that food deprivation and type of prey are two variables which influence the frequency and intensity of predatory behaviors of grasshopper mice.     

Lean and mean rats: Some effects of acute changes in the food supply upon territorial aggression

In experiment 1, individually housed rats subjected to short-term food restriction displayed more territorial aggression toward conspecific intruders than controls maintained on a free-feeding diet. In experiment 2, small groups of three adult male rats had access to either a standard laboratory diet or the standard diet plus sucrose. Groups with the sucrose supplement were significantly less aggressive toward intruders than controls. Sucrose availability did not produce appreciable gains in body weight but it did reliably decrease within-colony weight variation. The results suggest the existence of an effective dietary mechanism that enables a social species such as Rattus norvegicus to tolerate each other in dense feeding aggregations when food is abundant. Conversely, when food is limited, social intolerance increases and serves to limit the development of large feeding groups.