运动视觉的奇次倍频现象

当刺激图形为高速运动的方波光栅时,可观测到一种新的奇次谐波现象。当被试光栅为某些临界时间频率时,奇次谐波光栅静止不动,稍微偏离这些临界值,谐波光栅开始运动,其表现运动方向,或者与被试光栅相同,或者相反,这取决于被试光栅的时间频率高于或低于临界频率。本文使用视觉时空采样假设和付氏分析,初步解释了这一现象。     

Tactile pattern perception by two fingers: Temporal interference and response competition

The identification of a spatial pattern (target) presented to one fingerpad may be interfered with by the presentation of a second pattern (nontarget) to either the same fingerpad or a second fingerpad. A portion of the interference appears to be due to masking and a portion to response competition. In the present study, vibrotactile spatial patterns were designed to extend over two fingerpads. Target and nontarget patterns were presented to the same two fingerpads with a temporal separation between the two patterns. The function relating target identification to the temporal separation between the target and nontarget was very similar to the functions obtained with one-finger patterns in temporal masking studies. Subsequent measurements showed that a substantial portion of the interference resulted from response competition. Pattern categorization was better when patterns were presented to two fingers on opposite hands than to two fingers on the same hand; however, there was more interference for patterns presented bilaterally than for patterns presented ipsilaterally. The results supported the conclusion that similar processes are involved in the perception of sequences of spatial patterns whether the patterns are presented to one or to two fingers.     

CRT信号显示的刺激率和信号率对警觉作业的影响

本实验系统地考察了在不同刺激率、信号率条件下警觉水平的变化 ,并分析了以往警觉理论的适应条件。实验一采用 5次 /分、1 5次 /分和 30次 /分的刺激率条件 ,发现检测正确率在各条件下随时间的变化是由于 d′下降所致 ,而β值基本不变 ,可以认为警觉随时间下降是由于疲劳所致 ;中等刺激率条件下的 d′最高 ,低刺激率次之 ,高刺激率最差并且高刺激率导致被试唤醒水平降低。实验二在 30次 /分的高刺激率条件下变化信号率 (分别为 3次 /分、6次 /分和 1 2次 /分 ) ,发现信号率变化不会改变 d′,但导致β值的变化 ,可以认为高信噪比导致被试的唤醒水平升高     

Adjunctive brainstem behaviors in the rat

Adjunctive behaviors refers to behaviors that are “out of context” and/or excessive in amount. The terminology was first used for unexplained behaviors associated with food pellet ratio contingencies in food deprived rats (Falk, 1971). Clinically, unrelated and complex excessive behaviors were also noted with brainstem and diencephalic discharges (Andy, 1986, 1989 and 1995; Andy and Jurko, 1986). The objective of this study was to develop a model of brainstem generated adjunctive behaviors in the rat. Method: Sixty-one adult rats were used. Kindling was induced by mechanical and DC electrical perturbations in the midbrain. Nine different treatment groups were established in which lesions and drugs were used separately and in different combinations. Cocaine was used to accentuate, and dextrorphan to attenuate the kindling process. Behaviors were visually analyzed and recorded by video camera; they were not quantified. DC stimulation and EEGs were done with Grass instruments. Recording and stimulation sights were verified histologically. Results: A total of 45 different behaviors were elicited. DC stimulation kindled subjects had significantly more behaviors than did electrode insertion alone and cocaine alone. However, cocaine combined with DC stimulation increased the number and intensity of the kindled behaviors. Dextrorphan tended to facilitate catatonic and sleep states. Behaviors occurred randomly and were unrelated, even when they occurred in clusters. The behaviors were associated with four abnormal EEG discharge patterns. Conclusion: We speculate that brainstem behaviors are innate adjunctive drives that are generated in the brainstem reticular formation. They are monitored by the cortex and partially modified by environmental and cortical inputs.     

大学生人格因素的性别差异研究

本研究通过对246名大学生施测16PF,分析了16种人格因素的性别差异现象。结果表明：在恃强、怀疑、幻想、紧张这四个因素上存在性别差异,表现为男生比女生更好强、固执,更爱怀疑、紧张,女生比男生更富于幻想;在世故性上,女生的变异率大于男生,女生表现出两极分化特征;经探索性因素分析结果表明,男女生所提取出的因子数量相同,但男女生的因子结构有些差异。     

抑郁者操作任务中目标设立与自我评价的特点

参加研究的被试包括：抑郁性神经症组（２０人）,抑郁症组（１３人）,正常对照组（２９人）。所有被试在完成独粒钻石棋作业的前后对其作业目标进行了估计,并在作业后对操作的满意程度进行了评价,对影响操作者的因素进行了归因,研究所得到的主要结果为（１）抑郁者在操作任务前的目标设立与正常人或抑郁者相似。（２）实际作业成绩与效能感得分相关,（３）抑郁症,抑郁性神经症相被试消极的自我归因倾向明显高于正常组。     

自闭症谱系障碍个体的疼痛敏感性异常：来自元分析的证据

本研究采用元分析方法, 以疼痛阈限、疼痛诱发生理反应和疼痛评分为结果变量, 考察了自闭症谱系障碍个体(Autism Spectrum Disorder, ASD)的疼痛敏感性异常, 以期为ASD的诊断和干预提供参考。元分析共纳入16项研究(总样本量N = 822)。对于疼痛阈限, ASD组和对照组无显著差异, 但受到疼痛模态等变量的调节作用, 如ASD组的压力疼痛阈限显著低于对照组。对于疼痛诱发生理反应, ASD组对现实医疗疼痛的生理反应强于对照组。然而, ASD组和对照组在疼痛评分上无显著差异。将来研究应结合多模态疼痛刺激和多维度疼痛评估, 系统考察ASD个体的疼痛敏感性及其与临床核心症状之间的联系。     

大学生社会性发展与心理健康的关系:述情障碍的中介作用及其性别差异

为探究大学生社会性发展水平与心理健康的关系,同时为提升大学生的心理健康水平提供一定依据,采用《大学生社会性发展水平评定量表》、《多伦多述情障碍量表》（TAS-20）、《一般健康问卷》（GHQ-12）对贵州省某高校390名大学生进行问卷调查。结果发现：（1）大学生社会性发展水平能显著预测其心理健康水平;（2）述情障碍在大学生社会性发展水平与心理健康的关系之间起部分中介作用;（3）性别在社会性发展水平与心理健康的关系之间起调节作用。因此,心理健康工作者要注重考虑培养大学生的社会性技能和情绪识别、调控方面的能力,同时还要考虑性别差异,注重因材施教。     

知觉组织影响时序知觉的认知机制:ERP研究的证据

以往研究显示,知觉组织影响时序知觉,采用ERP技术拟探讨知觉组织影响时序知觉的认知机制。采集23名被试完成同时判断任务的脑电数据。行为结果发现,知觉组织影响时序知觉,具体表现为知觉组织条件的同时判断频率显著高于非知觉组织条件。ERPs结果发现,在P1和P2成分上,知觉组织条件与非知觉组织条件引发的波幅没有显著差异; 而在N1成分上,知觉组织条件诱发的N1波幅显著大于非知觉组织条件。这表明,知觉组织对时序知觉的影响可能发生在视觉刺激加工的早期阶段,视觉刺激的知觉组织先于时序信息加工。     

认知行为治疗对老年抑郁症病人的生活质量影响研究

将200例老年抑郁患者随机分为研究组和对照组.研究组认知行为治疗联合药物治疗,对照组单纯药物治疗.治疗前后进行CRI、SDSS、GAF等量表评定.6个月后,两组在大体功能、生活满意度、应对方式等方面有显著性差异(P<0.01).认知行为治疗有效改善老年抑郁症病人的应对方式,提高患者的生活满意度.