Changes in Multidigit Synergies and Their Feed-Forward Adjustments in Multiple Sclerosis

The authors explored the changes in multidigit synergies in patients with multiple sclerosis (MS) within the framework of the uncontrolled manifold hypothesis. The specific hypotheses were that both synergy indices and anticipatory synergy adjustments prior to the initiation of a self-paced quick action would be diminished in the patients compared to age-matched controls. The MS patients and age-matched controls (n = 13 in both groups) performed one-finger and multifinger force production tasks involving both accurate steady-state force production and quick force pulses. The patients showed significantly lower maximal finger forces and a tendency toward slower force pulses. Enslaving was increased in MS, but only in the lateral fingers (index and little). Indices of multifinger synergies during steady-state force production were lower in MS, mainly due to the lower amount of intertrial variance that did not affect total force. Anticipatory synergy adjustments were significantly delayed in MS. The results show that MS leads to significant changes in multidigit synergies and feed-forward adjustments of the synergies prior to a quick action. The authors discuss possible contributions of subcortical structures to the impaired synergic control.     

流动儿童同伴侵害的特点及与内化问题的循环作用关系:一项追踪研究

本研究采用纵向设计,以北京市426名四、五年级流动儿童为被试,进行连续4次的追踪测查,考察流动儿童同伴侵害的特点及其与内化问题的动态相互作用关系。结果发现:(1)打工子弟学校流动儿童的同伴侵害与内化问题水平比公立学校流动儿童高;流动儿童的流动性越大,同伴侵害和内化问题越多。(2)控制了性别、年级、家庭社会经济地位(SES)和流动性后,从T1到T2,同伴侵害与孤独感为相互作用关系,且同伴侵害可以显著预测抑郁,但对社交焦虑的预测作用不显著,而从T2到T4,同伴侵害和3种内化问题的相互作用模式完全一致,即T2时的社交焦虑、抑郁和孤独感显著预测T3的同伴侵害,进而显著预测T4的社交焦虑、抑郁和孤独感。(3)抑郁、孤独感与同伴侵害的循环作用在两类流动儿童中具有较强的稳定性,而在社交焦虑和同伴侵害的模型中,打工子弟学校流动儿童的同伴侵害对社交焦虑的作用比公立学校流动儿童更大。可见,同伴侵害和内化问题呈循环作用关系,未来预防/干预研究可以聚焦于减少流动儿童的同伴侵害或内化问题的角度打破二者的恶性循环,帮助他们建立良好的人际关系,构建良性循环,促进他们的积极发展。     

亲社会性视频游戏对内隐攻击性认知抑制效应的实验

利用亲社会性视频游戏和IAT测验,从内隐社会认知的角度研究亲社会性视频游戏对高中生内隐攻击性认知的影响,并分析影响是否具有性别差异和攻击特质差异。结果表明:(1)亲社会性视频游戏对高中生内隐攻击性认知的抑制效应显著;(2)游戏类型和性别对内隐攻击性认知的交互作用显著,亲社会性视频游戏更容易对女生的内隐攻击性认知产生抑制效应;(3)攻击特质对高中生的内隐攻击性认知的主效应显著,并且游戏类型和攻击特质对高中生内隐攻击性认知的交互作用显著,亲社会性视频游戏更容易对低攻击特质学生产生抑制效应。由此可见,亲社会性视频游戏能够有效抑制高中生的内隐攻击性认知水平。     

语音意识、语素意识和快速命名在儿童言语发展中的作用

以130名幼儿园小、中、大班儿童为研究对象,通过分层回归,系统比较了语音意识、语素意识和快速命名三种认知技能在学前儿童口语词汇、汉字识别和阅读理解等言语能力发展中的作用和相对重要性,结果发现:(1)学前儿童的各项能力随着年龄的增加而显著提高;(2)除了年龄因素之外,语音意识和语素意识是解释口语词汇的重要变量;(3)在控制了年龄和口语词汇量之后,语音意识、语素意识和快速命名能力都分别对汉字识别成绩具有独立的预测作用;(4)在控制了年龄、口语词汇量、汉字识别和其他两种认知技能之后,只有语素意识仍然能够独立预测阅读理解成绩,表明语素意识对于汉语阅读能力的发展具有独特的作用.     

大学生人格评定的和谐追求——200个人格词汇喜好度中美对比研究

本研究选取Anderson1968年研究中的200个核心人格特质词汇,请165名在校大学生对词汇进行喜好度评定.对比Anderson(1968)的研究结果,发现:1)中西方被试均将真诚评定为最受欢迎的个性品质;2)中国被试作答较少出现极端值;3)中国被试评出的前10位积极品质均与人际和谐有关;而西方被试评出的前10位积极品质主要涉及诚信和个人能力两方面;4)中西方被试评出的前10位消极词汇均为他相关词汇,并和积极词汇相对应.     

道德与自然:"形上之道"与"形而上学"的本质区别

Both thinkings on Dao in Chinese philosophy and metaphysics in Western philosophy investigate things on a spiritual level that transcends experience, but there are incommensurable differences between them. The objective of “metaphysics” is ontological knowledge about nature from the perspective of epistemological “truth-pursuing”. Western metaphysics is thus a “metaphysics of nature”. Dao in Chinese philosophy, on the other hand, more often manifests itself in “good-pursuing” by means of the internal, experiential pursuit of moral stature and spiritual security. Philosophy of Dao is thus a “metaphysics of ethics”. The cause of this difference can be traced back to the differences between the rational tradition of the West, characterized by the dualism of the subject and the object, and the moral tradition of China, characterized by the integration of man and nature. __________ Translated by Zhang Lin from Lunlixue yanjiu 伦理学研究 (Studies in Ethics), 2007, (4): 62–65     

伏隔核和中脑腹侧被盖区内食欲素在吗啡奖赏中的作用

实验采用条件性位置偏爱（CPP）模型考察中脑腹侧被盖区（VTA）和伏隔核壳区（NAcSh）内食欲素（orexin）在吗啡奖赏中的作用。Wistar大鼠分为盐水训练组和吗啡训练组。3轮吗啡（或盐水）匹配训练前,双侧VTA或NAcSh内给予OXR1拮抗剂SB334867（VTA: 0, 1, 5μg;NAcSh: 0, 1, 3μg）;或2轮吗啡（或盐水）匹配训练前NAcSh内给予orexin A（0, 2, 4, 6μg）,观察其对吗啡CPP建立的影响。结果表明,VTA内给予SB334867抑制吗啡CPP建立,并存在剂量效应关系;NAcSh内给予SB334867或orexin A均未影响吗啡CPP建立,而orexin A可增加吗啡处理大鼠的运动性。以上结果表明,VTA和NAcSh内的orexin在吗啡奖赏中扮演的角色不同,可能调控成瘾行为的不同成分     

The “Obama Effect”: How a salient role model reduces race-based performance differences

Barack Obama, the first Black-American president, has been widely heralded as a role model for Black-Americans because he inspires hope. The current study was conducted to assess whether, beyond simply inspiring hope, this “Obama Effect” has a concrete positive influence on Black-Americans’ academic performance. Over a three-month period we administered a verbal exam to four separate groups of Black- and White-American participants at four predetermined times. When Obama’s stereotype-defying accomplishments garnered national attention - just after his convention speech, and election to the presidency - they had a profound beneficial effect on Black-Americans’ exam performance, such that the negative effects of stereotype threat were dramatically reduced. This effect occurred even when concerns about racial stereotypes continued to exist. The fact that we found performance effects with a random sample of American participants, far removed from any direct contact with Obama, attests to the powerful impact of ingroup role models.     

内隐记忆中通道效应的认知与神经机制

通道转换是使内隐和外显记忆任务之间产生功能性分离经常操纵的典型变量之一,被看作是内隐记忆主要依赖刺激知觉住处加工的有利语气。该文回顾了近些年通道效应实验和理论研究的有关文献。对产生通道效应的认知机制和神经解剖基础进行了总结和分析,并提出了有待于进一步验证的问题。