药物成瘾理论的新进展

成瘾过程伴随着一系列脑机能和心理机能的改变,但对药物滥用如何导致这些改变以及它们如何诱发成瘾却存在着不同的解释。近年来,由于认知心理学和认知神经科学研究技术在该领域的应用,研究者对药物成瘾过程的认知机能及其脑机制获得了新的认识,且基于对负性生活事件及外部压力在维持药物滥用及诱发复吸行为中的作用的测量学研究和动物实验研究而提出的成瘾理论为该领域的研究开辟了新的思路。本文重点评述了药物成瘾的认知加工模型和以压力或负性情绪为核心的相关理论模型及其研究,并提出进一步研究的方向。     

关于多发性骨髓瘤的诊断

多发性骨髓瘤是浆细胞克隆性增生的恶性肿瘤,起病隐匿,临床表现复杂多样,且无特异性,诊断上依赖实验室检查。临床上对该病足够的认识,正确诊断尤为重要。在诊断中,科学地应用哲学思维,有助于减少误诊和漏诊。     

算术应用题的分类结果与数学成绩关系研究

以算术应用题为材料,探讨了不同年级、不同数学成绩学生对算术应用题的分类结果及其与数学成绩的关系。结果表明:不同年级学生对算术应用题分类结果差异显著;数学成绩优生与数学成绩差生对算术应用题分类结果存在差异。     

自尊对自我确认倾向的影响:来自人际选择的证据

采用改编后的“整体自尊问卷”和“交谈自尊问卷”筛选出整体自尊和交谈自尊高低不同的四组被试,通过模拟现实人际互动情境,在评价人对被试的交谈表现提供不同评价(肯定或否定)及表达不同交友态度(接受或排斥)的条件下,考察了整体自尊与特殊自尊对人际互动过程中自我确认倾向的影响,结果表明:(1)不论社交需求是否获得满足,即整体自尊是否得以维持,被试的自我确认倾向都只受特殊自尊的调节;(2)在社交需求和一致性需求同时获得满足,即整体自尊与特殊自尊均得以维持时,被试的自我确认倾向受整体自尊和特殊自尊的共同调节;(3)在社交需求和一致性需求未同时获得满足,即整体自尊和特殊自尊不能同时得以维持时,高整体自尊者的自我确认倾向受特殊自尊的调节,而低整体自尊者未表现出自我确认的倾向。     

海洛因戒除者对相关线索和负性生理线索的注意偏向

以84名海洛因戒除者和20名正常成人为被试,采用情绪stroop范式探讨了不同康复时相海洛因戒除者对海洛因相关线索和负性生理线索的注意偏向。结果发现,海洛因戒除者对表征与海洛因滥用相关的负性生理线索和表征海洛因使用行为的相关线索存在同等效力的注意偏向,且在不同康复时相内具有稳定性。该研究为解释基于戒除症状的负性情绪对于诱发依赖者药物渴求感和复吸行为的作用及整合基于对相关线索注意偏向的认知加工理论和基于对负性情绪的回避的负强化情绪加工理论提供了实验证据。     

语文学困生与学优生阅读理解监控的发展研究

本研究采用错误检测法和理解自信度评价法,以错误觉察人数、错误觉察成绩、理解自信度评价成绩、阅读时间和阅读理解成绩为分析指标,探讨了不同年级语文学困生与学优生的阅读理解监控特征。结果发现:(1)语文学困生的阅读理解监控能力明显低于学优生;(2)学生对低难度错误信息的理解监控能力明显高于对高难度错误信息的理解监控;(3)随着年级的增长,学生的阅读理解监控能力也随之提高。     

Synergy of stimulus-driven salience and goal-directed prioritization: Evidence from the spatial blink

In the spatial blink paradigm, participants search for a target of a designated color in a rapidly presented stream of letters at fixation. Target identification is typically impaired if a peripheral distractor appears shortly before the target, inducing a spatial blink, but impairment is observed only when the distractor also shares the sought-for color. Such results reveal an important top-down influence on the capture of attention. In the present experiments, we examined the influence of the bottom-up transients associated with the appearance and disappearance of distractors in the spatial blink paradigm. Onsets and offsets alone are incapable of inducing a spatial blink, but we found that the presence of such transients did enhance the effects of target-color-matched distractors. The results reveal important synergistic interactions between top-down and bottom-up factors involved in attentional capture.     

Performance-based adaptive schedules enhance motor learning

Although investigators have shown that random scheduling of several tasks enhances learning more than blocked scheduling does, the advantages of random scheduling may be limited because it does not take into account the nominal difficulty of each task, the difference in difficulty between tasks, and the skill level of the learner in that type of schedule. The authors propose 2 new algorithms for adaptively determining the nominal difficulty and the number of trials for each task on the basis of both current and delayed performance of the learner (N = 48). The authors tested the adaptive algorithms in a 2 x 2 factorial design, and they show that the algorithms outperform random scheduling when performance is measured on a delayed retention test.     

Developmental trajectories of anxiety symptoms among boys across early and middle childhood

This study examined the developmental trajectory of anxiety symptoms among 290 boys and evaluated the association of trajectory groups with child and family risk factors and children's internalizing disorders. Anxiety symptoms were measured using maternal reports from the Child Behavior Checklist (T. M. Achenbach, 1991, 1992) for boys between the ages of 2 and 10. A group-based trajectory analysis revealed 4 distinct trajectories in the development of anxiety symptoms: low, low increasing, high declining, and high-increasing trajectories. Child shy temperament tended to differentiate between initial high and low groups, whereas maternal negative control and maternal depression were associated with increasing trajectories and elevated anxiety symptoms in middle childhood. Follow-up analyses to diagnoses of preadolescent depression and/or anxiety disorders revealed different patterns on the basis of trajectory group membership. The results are discussed in terms of the mechanisms of risk factors and implications for early identification and prevention.