定向遗忘的编码加工机制

有目的的遗忘(定向遗忘)需要耗费认知努力吗?有研究发现, 定向遗忘可能是被动衰减的结果, 即F项目(需要遗忘的项目)未获得有效复述是选择性复述了R项目(需要记住的项目)造成的, 这一加工过程不需要认知努力; 但也有研究表明, 定向遗忘过程可能是遗忘线索诱发的对记忆加工的主动抑制, 需要耗费认知努力, 脑认知研究中发现的前额叶ERPs成分为这一机制提供了证据。还有一种观点认为, 定向遗忘编码过程可能同时包含主动抑制与被动衰减, 但是尚不清楚两种加工机制相互作用的方式。为进一步澄清定向遗忘编码阶段的认知机制, 未来研究需要将非认知因素纳入考察, 并关注不同人群的定向遗忘特征, 在此基础上尝试解决理论争议。     

One year after ischemic stroke: Changes in leg movement path stability in a speed–accuracy task but no major effects on the hands

First year after the stroke is essential for motor recovery. The main motor control strategy (i.e., faster movement production at the expense of lower movement accuracy and stability, or greater movement accuracy and stability at the expense of slower movement) selected by poststroke patients during a unilateral speed–accuracy task (SAT) remains unclear. We aimed to investigate the poststroke (12 months after stroke) effects on the trade-off between movement speed and accuracy, and intraindividual variability during a motor performance task. Healthy right-handed men (n = 20; age ∼ 66 years) and right-handed men after ischemic stroke during their post rehabilitation period (n = 20; age ∼ 69 years) were asked to perform a simple reaction task, a maximal velocity performance task and a SAT with the right and left hand, and with the right and left leg. In the hand movement trial, reaction time and movement velocity (V_max) in the SAT were slower and time to V_max in the SAT was longer in the poststroke group (P < .01). In the leg movement trial, poststroke participants reached a greater V_max in the SAT than the healthy participants (P < .01). The greatest poststroke effect on intraindividual variability in movements was found for movement path in the SAT, which was significantly greater in the legs than in the hands. Poststroke patients in the first year after stroke mainly selected an impulsive strategy for speed over hand and leg motor control, but at the expense of lower movement accuracy and greater variability in movement.     

The Experiences of College Students in Recovery From Substance Use Disorders

Colleges are often substance‐saturated environments, creating challenges for students trying to maintain recovery from substance use disorders. Using phenomenological method, this study sought to enhance understanding of the experiences of college students in recovery. Findings include 6 main themes that describe the experiences of participants, and implications for professional counselors are delineated from these findings.     

Discrimination between safe and unsafe stimuli mediates the relationship between trait anxiety and return of fear

Individuals with anxiety disorders show deficits in the discrimination between a cue that predicts an aversive outcome and a safe stimulus that predicts the absence of that outcome. This impairment has been linked to increased spontaneous recovery of fear following extinction, however it is unknown if there is a link between discrimination and return of fear in a novel context (i.e. context renewal). It is also unknown if impaired discrimination mediates the relationship between trait anxiety and either spontaneous recovery or context renewal. The present study used a differential fear conditioning paradigm to examine the relationships between trait anxiety, discrimination learning, spontaneous recovery and context renewal in healthy volunteers. Fear learning was assessed using continuous ratings of US expectancy and subjective ratings of fear. Discrimination mediated the relationships between trait anxiety and both spontaneous recovery and context renewal such that elevated trait anxiety was associated with poorer discrimination, which in turn was associated with increased fear at test phases. Results are discussed in terms of the genesis and maintenance of anxiety disorders.     

Using Photography to Explore Recovery Themes With Veterans

This author of this study examined if creating photographs to explore a recovery experience could be therapeutic. Veterans from multiple war periods, who were receiving outpatient mental health treatment, voluntarily enrolled in a six-week photography workshop. During the workshop, 31 veterans learned the basics of photography and discussed recovery challenges with peers. For the final class, participants created a six-image portfolio that visually expressed a personal recovery theme. Pre-and post, 10-item Likert scale questionnaires were completed in order to evaluate the benefits of the photography workshop. There was a statistically significant increase in the post test questionnaire score (+0.47 points, p = 0 .001). The findings support the hypothesis that taking photographs while in recovery can improve personal reflection and organization of thinking, as well as promote recovery discussions, communication, social support, and sense of purpose. Recovery themes included dealing with pain, isolation, growth, transformation, and healing.     

Move2Love and Vibrancy: Community Dance/Fitness

The Move2Love program demonstrates the feasibility of establishing community-based programs involving dance and exercise to support physical and social well-being in older women. The social fitness program has been running continuously for 23 years. It currently involves 125 to 175 women between the ages of 54 and 94 in weekly rhythmic training sessions. In addition to meeting the initial goals of addiction avoidance in an at-risk population, this program has contributed to the well-being of participants, both by lowering disease burden, and by increasing physical, social, and psychological fitness. This article describes the program and explores the reasons that it has continued to work for over two decades. It also demonstrates the value experienced by participants in their own words. The Move2Love program could serve as a feasibility pilot for other communities wishing to create sustainable, salutary activity programming to enhance the well-being of senior women.     

Relational recovery after infidelity as a dual process: A model based on the experiences of female injured partners

In the literature, relational recovery after infidelity is often described as a process going through different consecutive stages towards a reconciliation. We interviewed 25 injured partners and invited them to look back and talk about what helped them to recover from the pain and the conflicts caused by the relational infidelity of their partner. From their stories—through thematic analysis—four themes emerged: 1. talking, 2.the truth, 3. trust and 4. ethical imbalance. It furthermore struck us how the participants described their recovery process as an experience of being oscillated between connection and disconnection. These findings pointed us in the direction of developing a dual process model that fits with our participants' experiences of recovering after infidelity, while emphasizing the dynamic nature of their stories.     

Habituation contributes to within-session changes in free wheel running.

Three experiments tested the hypothesis that habituation contributes to the regulation of wheel running. Rats ran in a wheel for 30-min sessions. Experiment 1 demonstrated spontaneous recovery. Rats ran more and the within-session decreases in running were smaller after 2 days of wheel deprivation than after 1 day. Experiment 2 demonstrated dishabituation. Running rate increased immediately after the termination of a brief extra event (application of the brake or flashing of the houselight). Experiment 3 demonstrated stimulus specificity. Rats completed the second half of the session in either the same wheel as the first half, or a different wheel. Second-half running was faster in the latter case. Within-session patterns of running were well described by equations that describe data from the habituation, motivation, and operant literatures. These results suggest that habituation contributes to the regulation of running. In fact, habituation provides a better explanation for the termination of wheel running than fatigue, the variable to which this termination is usually attributed. Overall, the present findings are consistent with the proposition that habituation and sensitization contribute to the regulation of several forms of motivated behavior.     

语言表达方式对科学概念语义提取时间的影响

研究语言表达方式对科学概念语义提取的影响。结果表明,科学概念也具有一定的典型性效应。在词的快速分类和句子证实作业中,名称中有上属标记有利于概念的语义提取。