B超配合在乳腺良性肿块麦默通手术中的作用

探讨B超配合在麦默通微创行乳腺良性肿块切除术中的作用。对569例乳腺肿块进行麦默通微创切除术,分别于术前进行B超定位,术中进行B超引导,术后B超探查及随访,分析B超配合对手术的彻底性、安全性和准确性等所起的作用与意义。结果569例患者的乳腺病灶均被准确切除,B超熟练程度决定手术的准确性、彻底性及手术时间。术中B超配合20次以上者,其一次定位成功并一次完全切除率达87.4%,与初次(B超配合20次以下)配合者相比,两者有显著性差异(P=0.000);手术时间亦比初次B超配合者要短,两者有显著性差异(P=0.000)。熟练的B超配合,有利于麦默通微创旋切技术准确、有效、快速而安全的切除乳腺良性肿瘤。     

Factors Related to Recidivism Among Delinquent Females at a State Correctional Facility

Although much of the research has focused on male delinquents, females are increasingly involved in violent crimes. We investigated factors that may be related to recidivism among delinquent females committed to a state correctional facility. The records of 238 female delinquents were examined and 96 were found to be recidivists. Our findings were consistent with previous research showing that age at first offense and first commitment differentiated recidivists from non-recidivists. Additional discriminant factors included deficits in basic math skills, gang affiliation, abuse, location of residence, and length of stay at the facility.     

Sex differences in object location memory and spatial navigation in Long-Evans rats

In both humans and rodents, males typically excel on a number of tasks requiring spatial ability. However, human females exhibit advantages in memory for the spatial location of objects. This study investigated whether rats would exhibit similar sex differences on a task of object location memory (OLM) and on the watermaze (WM). We predicted that females should outperform males on the OLM task and that males should outperform females on the WM. To control for possible effects of housing environment, rats were housed in either complex environments or in standard shoebox housing. Eighty Long-Evans rats (40 males and 40 females) were housed in either complex (Complex rats) or standard shoebox housing (Control rats). Results indicated that males had superior performance on the WM, whereas females outperformed males on the OLM task, regardless of housing environment. As these sex differences cannot be easily attributed to differences in cognitive style related to linguistic processing of environmental features or to selection pressures related to the hunting gathering evolutionary prehistory of humans, these data suggest that sex differences in spatial ability may be related to traits selected for by polygynous mating strategies.     

位置和轨迹信息在短暂消失目标复原过程中的作用

研究发现在多目标追踪任务中,即使视野中的所有物体同时消失长达几百毫秒,被试也能成功地完成追踪任务。Horowitz等（2006）认为这种能力主要是依靠把刺激消失时的目标信息保存在一种离线存储（off-line memory）记忆当中。这样,当刺激再现时,被试就可以把当前画面与存储的内容进行比较来区分目标和非目标。本研究的目的在于探讨目标位置、运动轨迹等信息在目标复原过程中的作用。结果发现：(1) 目标再现位置与消失位置相同时,被试的成绩最好,这说明在目标复原过程中利用了基于位置匹配的策略。(2)当目标再现位置与其消失前的运动方向一致或位于其消失前的运动轨迹上时,成绩较对照条件（目标再现于运动轨迹的法线方向）要好,这说明被试能够利用目标运动的轨迹和方向等信息。（3）当追踪的目标数量增加时,目标运动轨迹和方向等信息在复原过程中的相对作用下降,且被试只能利用1~2个目标的轨迹和运动方向信息     

选择性注意的两种负启动效应研究回顾及比较

通过比较特性负启动和位置负启动两种实验范式．对选择性注意的负启动研究进行回顾与总结：从研究方法、行为及脑成像结果等方面对特性和位置负启动研究进行比较分析;简要介绍负启动机制,并从客体与空间选择性注意的分离、视觉加工神经通道和工作记忆等方面对特性和位置负启动异同的原因进行初步探讨。对特性和位置负启动及其脑机制的差异研究将有利于对负启动效应及其机制的进一步考察．并指出负启动范式在分心抑制等研究方向具有广泛的应用前景。     

Memory for object locations: Priority effect and sex differences in associative spatial learning

This paper reports two experiments conducted to examine priority effects and sex differences in object location memory. A new task of paired position-learning was designed, based on the A–B A–C paradigm, which was used in paired word learning. There were three different paired position-learning conditions: (1) positions of several different objects (B-objects and C-objects) around referent objects (A-objects) were learned in the A–B A–C position-learning condition, (2) positions of several different objects with no referent objects were learned in the 0–B 0–C position-learning condition, and (3) positions of identical objects (stars) with no referent objects were learned in the 0-star 0-star position-only condition. The results revealed a significant priority effect on performance in the A–B A–C and the 0–B 0–C position-learning conditions but not in the 0-star 0-star position-only condition. Contradictory results were obtained with respect to the sex variable: a female superiority effect on paired position learning was significant in Experiment 1, but this effect was not replicated in Experiment 2. In addition, an articulatory suppression task used in Experiment 2 had a significant effect on recall of different object positions but no effect on recall of identical object positions. This suggested that verbal encoding was not necessary for learning of positions of identical objects.     

文字与图片呈现形成想象空间记忆的比较

学习通过文字或图片方式显示的空间布局材料之后,采用空间定位任务．分别检验在不同朝向和相对位置的条件下,对想象空间方位判断的差异。结果表明,使用图片进行空间布局的学习,记忆后再各自以同样显示形式进行空间定位任务时,判断的速度比使用文字的反应时要快;同时,无论是文字还是图片形式呈现．在进行想象转向时．都会呈现朝向效应和相对位置效应。     

空间相对位置效应的时间特征

用方位箭头作探测刺激,研究故事阅读产生的想象空间中物体搜索任务的反应时模式。结果发现：(1)方位箭头的指向对物体搜索有影响,反应时模式为：左=右=前＜后,说明方位箭头作探测刺激时的物体搜索过程不涉及人一物空间关系的转换;(2)目标物体与注意物体的相对位置对物体搜索有影响,反应时模式为注意点＜注意点对面＜注意点左侧=注意点右侧,说明相对位置效应与人物空间关系的转换无关。本研究结果支持了两阶段理论。     

并列和偏正结构双字合成词的注视位置效应

采用EyeLink II眼动仪, 选取并列结构和偏正结构两种类型的目标词, 要求大学生被试阅读包含有目标词的句子, 以探讨两种双字合成词的注视位置效应。结果发现：在阅读并列和偏正结构的目标词时, 单次注视条件下读者往往将首次注视定位于词的中心位置, 多次注视时首次注视往往落在词的开端部分; 当首次注视落在词的开端时再注视该词的概率增加, 而且再注视往往落在词的结尾部分。结果提示：在单次注视条件下存在偏向注视位置; 双字合成词结构不影响偏向和最佳注视位置; 研究结果支持“战略-战术”模型。     

动态情景中颜色特征和身份特征在返回抑制中的作用

在动态的“线索-靶子”范式中引入隧道刺激, 以靶子与线索的非空间特征相同时的反应延迟测量返回抑制效应。实验1利用单向隧道创设客体的空间位置信息明确且可靠的条件, 考察客体的颜色特征在返回抑制中的作用。实验2利用双向隧道创设客体的空间位置信息不明确的条件, 考察客体的颜色特征在返回抑制中的独立作用。实验3、4分别采用与实验1、2类似的方法, 在动态任务情景中考察客体的身份特征在返回抑制中的作用。结果显示, 线索呈现与靶子呈现的时间间隔较长时, 4个实验中均存在显著的返回抑制效应。这表明, 动态情景中, 客体的空间位置信息明确且可靠时, 颜色特征和身份特征在返回抑制中都发挥着重要作用; 客体的空间位置信息不明确时, 颜色特征和身份特征在返回抑制中也都具有相对独立的作用。