Self-Selected Visual Information During Discrete Manual Aiming

The authors examined strategic selection of visual samples during manual aiming. Participants (N = 12) wore liquid-crystal goggles while performing discrete movements to a small target. Initially, participants controlled a 40-ms visual sample via a switch in their nonaiming hand. Subsequently, experimenter-imposed strategies required participants to take visual samples before movement initiation or early or late in the movement. Although participants adopted a variety of strategies to optimize the use of vision, they were more likely to select a sample during the early stages of the movement. Experimenter-imposed early and late instructions resulted in longer movement times than did self-selected sampling. Compared with late sampling, early sampling resulted in a temporal advantage with similar accuracy.     

The ethics activities of the World Medical Association

Since its formation in 1947, the World Medical Association (WMA) has been a leading voice in international medical ethics. The WMA’s principal ethics activity over the years has been policy development on a wide variety of issues in medical research, medical practice and health care delivery. With the establishment of a dedicated Ethics Unit in 2003, the WMA’s ethics activities have intensified in the areas of liaison, outreach and product development. Initial priorities for the Ethics Unit have been the review of paragraph 30 of the Declaration of Helsinki, the expansion of the Ethics Unit section of the WMA website and the development of an ethics manual for medical students everywhere. An earlier version of this paper was presented at an international conference, “The Ethics of Intellectual Property Rights and Patents,” held in Warsaw, Poland on 23–24 April, 2004.     

Coupling of postural and manual tasks in expert performers

The purpose of this study was to investigate the integration of bimanual rhythmic movements and posture in expert marching percussionists. Participants (N = 11) performed three rhythmic manual tasks [1:1, 2:3, and 2:3-F (2:3 rhythm played faster at a self-selected tempo)] in one of three postures: sitting, standing on one foot, and standing on two feet. Discrete relative phase, postural time-to-contact, and coherence analysis were used to analyze the performance of the manual task, postural control, and the integration between postural and manual performance. Across all three rhythms, discrete relative phase mean and variability results showed no effects of posture on rhythmic performance. The complexity of the manual task (1:1 vs. 2:3) had no effect on postural time-to-contact. However, increasing the tempo of the manual task (2:3 vs. 2:3-F) did result in a decreased postural time-to-contact in the two-footed posture. Coherence analysis revealed that the coupling between the postural and manual task significantly decreased as a function of postural difficulty (going from a two-footed to a one-footed posture) and rhythmic complexity (1:1 vs. 2:3). Taken together, these results demonstrate that expert marching percussionists systematically decouple postural and manual fluctuations in order to preserve the performance of the rhythmic movement task.     

空间-时间联合编码效应：来自手动和眼动证据

本研究探讨汉语背景下不同反应方式（手动,眼动）、不同方位（水平,垂直）上空间-时间联合编码效应（STEARC效应）存在的可能性。四个实验均采用两类时间词语诱发被试的时间表征,采用2（时间：过去、将来）×2（反应手/眼跳方向：左、右/上、下）的被试内设计。结果表明汉语背景下的人们将过去和身体左边（上）联系在一起,把将来和右边（下）联系在一起,人们存在自左向右和自上而下的STEARC效应,这种效应不存在手动和眼动的分离,人们对时间的表征不仅是一条时间线,更是一个心理时间地图。     

3-6岁幼儿言语表达能力发展特点研究

本研究采用口语表述和运作表达两个实验探讨了3—6岁幼儿言语表达能力的发展特点。结果表明;幼口语表达和动作表现能力随年龄增长逐渐提高,3—5岁是幼儿口语表述能力发展的快速期。口语表述内容由可视的、外在的特征逐渐转向内在特征,呈现由固有属性向关系属性发展的趋势。幼儿期动作表达特点以发展核心动作并进行扩展为主。4岁是动作表达的转折时期。4岁和5岁是两种表达方式关系发展最密切的时期。     

Slow Motor Responses to Visual Stimuli of Low Salience in Autism

ABSTRACT

The authors studied 2 tasks that placed differing demands on detecting relevant visual information and generating appropriate gaze shifts in adults and children with and without autism. In Experiment 1, participants fixated a cross and needed to make large gaze shifts, but researchers provided explicit instructions about shifting. Children with autism were indistinguishable from comparison groups in this top-down task. In Experiment 2 (bottom-up), a fixation cross remained or was removed prior to the presentation of a peripheral target of low visual salience. In this gap–effect experiment, children with autism showed lengthened reaction times overall but no specific deficit in overlap trials. The results show evidence of a general deficit in manual responses to visual stimuli of low salience and no evidence of a deficit in top-down attention shifting. Older children with autism appeared able to generate appropriate motor responses, but stimulus-driven visual attention seemed impaired.     

Motor Performance and Response Consistency as a Function of Age

The specificity versus generality of motor performance and motor response consistency was investigated as a function of age. 120 Ss, 30 each at age 7, 11, 15, and 19 yr., were given 120 practice trials (60 trials per session with 24 hr interpolated between sessions) on both simple and choice RT tasks. For motor performance the reliability of individual differences was high in both tasks at all ages, while the amount of generality was moderately high in the two younger groups but diminished with age. The reliability coefficients for motor response consistency were low for both tasks but, with two exceptions, statistically significant. There was no evidence for generality in motor response consistency at any age.     

EVALUATION OF A TRAINING MANUAL FOR THE ACQUISITION OF BEHAVIORAL ASSESSMENT INTERVIEWING SKILLS

Two procedures were used to teach behavioral assessment interviewing skills: a training manual and one-to-one instruction that included modeling, rehearsal, and feedback. Two graduate students and two advanced undergraduates were trained with each procedure. Interviewing skills were recorded in simulated assessment interviews conducted by each student across baseline and treatment conditions. Each training procedure was evaluated in a multiple baseline across students design. The results showed that both procedures were effective for training behavioral interviewing skills, with all students reaching a level of 90%-100% correct responding. Finally, a group of experts in behavior analysis rated each interviewing skill as relevant to the conduct of an assessment interview and a group of behavioral clinicians socially validated the outcomes of the two procedures.     

Training respite care providers for families with handicapped children: Experimental analysis and validation of an instructional package

We conducted four experiments to evaluate a respite care training package. In Experiment 1, we assessed the effectiveness of an instructional manual on the acquisition of respite care skills and compared the relative effects of three different manual on the acquisition of respite care skills and compared the relative effects of three different manual presentation formats. Results showed that performance during simulated (role-played) respite care situations improved substantially for all six trainees following presentation of the instructional manual (with no significant differences between presentation formats) although some remedial training was necessary to achieve mastery criterion. In Experiment 2, we evaluated the effects of the manual presented as a whole with a larger group of trainees and compared it to a workshop training approach. Results showed that both the instructional manual and workshop training approaches were effective, but that the former appeared to be more cost-effective. In both experiments, correct responding generalized to a respite care situation with a multiply handicapped child. In addition, several measures of social validity were obtained. In Experiment 3, we evaluated a simplified training and assessment package that could be conducted using the resources typically available to respite care agencies, and in Experiment 4, we demonstrated that respite care agency personnel could successfully implement this program.