VDT作业中屏面背景亮度与对比度的交互作用

VDT的亮度对比度和屏面亮度在对操作者视觉功能的影响中,存在着交互作用。VDT的最佳对比度和适宜对比度范围随屏面亮度水平而变化,提高屏面亮度可以使最佳对比度值和适宜对比度范围向低对比度端偏移。评价VDT显示质量,主观评价法具有与作业绩效指标同样的价值。     

视觉显示终端屏面亮度水平和对比度对视疲劳的影响

本实验研究了VDT不同屏面亮度与对比度对视疲劳的影响。实验中采用远近视点的眼肌调节时间变化率作指标,对VDT作业的不同时段进行视疲劳测定。屏面亮度取20、30、40Cd/m~2三种水平,对比度取3:1至15:1,分成七等。实验结果表明,在本实验所取的屏面亮度范围内:(1)9:1～11:1对比度所引起的视疲劳最轻,对比度愈趋近高低两端所引起的视疲劳愈深;(2)不同水平的屏面亮度对视疲劳有不同程度的影响。对比度小于7:1时,高亮屏所引起的视疲劳程度比低亮屏的轻;对比度大于7:1时,高亮屏比低亮屏更易引起疲劳。     

VDT界面颜色视觉工效:色调因素对视觉绩效的影响

此项研究通过多色彩前景色和背景色匹配的字符辨别反应时实验研究,探索多种颜色对比条件下的色调因素对视觉反应绩效的影响,试图探索多色彩对比条件下的何种色调匹配具有最佳视觉绩效.结果表明色调对视觉反应绩效有显著影响.互补色匹配的视觉绩效优于平均视觉绩效,同色调对比匹配的视觉绩效低于平均视觉绩效.     

视觉监控作业中信号间隔时间和双任务对信号觉察的影响

本研究运用模拟实验,考察了以仪表显示为主的监控系统中信号间隔时间和双作业任务对人觉察信号的反应时间的影响.双作业中的主任务是要求被试同时监视4个仪表,次任务为对显示屏上一个红色亮点是否出现闪烁作简单的辨别反应.实验结果表明信号间隔时间是影响信号觉察反应时的一个重要因素.随着信号间隔时间由30-50秒延长到8-10分钟,信号觉察反应时随之先快后慢地增加.在低负荷的仪表监视作业中,通过增加一个刺激率较高而又比较简单的次任务,可使被试保持较高的唤醒水平和更好地集中注意,从而有利于提高信号觉察效率.     

背景线索对视觉客体连续性表征的影响

该研究考察了背景线索连续性对客体心理表征连续性的作用。采用2（目标客体运动形式：连续和不连续）×2（引导线索运动形式：连续和不连续）两因素被试内设计,12名被试参加实验。结果发现,目标客体在时空上不连续时,连续线索条件下对颜色变化检测反应时小于线索不连续条件;目标客体在时空上连续运动时,不连续线索条件下对目标颜色变化的检测反应时高于线索连续条件。因此,不连续背景线索对物理层面上连续运动客体的表征有干扰影响：连续背景线索对物理层面上不连续运动客体的表征有促进作用。这说明特殊的时空条件如背景线索引导会对客体表征连续性产生重要影响。     

照明环境与LCD显示界面背景饱和度的交互效应对视觉绩效的影响

摘 要 采用E-prime编排认知实验研究照明环境与TFT-LCD视觉显示终端界面背景饱和度的交互效应对视觉绩效的影响。依据字母视力表设计原理制作认知材料,以认知速度与准确率为视觉绩效评价指标。结果发现,照度与饱和度的交互效应对视觉绩效存在显著影响,色温与饱和度的交互效应仅对准确率存在显著影响,三因素交互作用对准确率存在显著影响。结果表明,不同照度、色温下,通过调节显示终端界面背景饱和度可改善视觉绩效。     

视觉预期和注意指向对姿势和动作肌肉预期和补偿姿势调节的影响

采用经典落球试验研究范式,同步观察视觉预期和注意指向对腰部姿势肌肉和上肢运动肌肉预期和补偿姿势调节的影响,探索视觉预期和注意指向影响姿势控制的早期心理生理机制。24名青年志愿者(10名男性,14名女性)参与完成本实验,分别在有、无视觉预期以及注意指向"托盘稳定"或者"重心稳定"的实验条件下观察外部姿势干扰对腰部姿势肌肉(L5~S1腰部多裂肌)和上肢动作肌肉(肱二头肌)预期姿势调节(anticipatory postural adjustments,APAs)和补偿姿势调节(compensatory postural adjustments,CPAs)相关时间和强度参数的影响。APAs和CPAs的时间和强度参数通过获取被检肌肉s EMG信号并参照相关检测规范进行。结果显示:(1)视觉预期对多裂肌的APAs启动时间,对肱二头肌的APAs启动时间、APAs强度和CPAs强度有显著影响;(2)注意指向对多裂肌的CPAs启动时间和肱二头肌APAs启动时间有显著影响;(3)视觉预期和注意指向对肱二头肌的APAs启动时间和APAs强度有交互作用。研究认为,突发外部姿势干扰条件下姿势肌肉和动作肌肉的姿势调节策略具有一定的差异,视觉预期和注意指向仅对姿势肌肉的时间参数有影响,对动作肌肉APAs和CPAs时间和强度参数都产生调节作用,表明在中枢神经系统的姿势控制中,人体姿势策略的调节是通过对姿势肌肉和动作肌肉的双重控制来完成的,视觉预期效应和心理指向效应反映在对不同功能肌肉前馈控制和反馈控制相应参数的调节。     

视标亮度、眩光距离和眩光面积对视觉判读作业绩效的影响

1　引言眩光对视觉作业的绩效有着很大的影响 ,视标亮度、眩光距离和眩光面积是影响眩光效应的三个重要因素。近年已有不少学者分别对这三个因素进行了研究。本研究拟用正确率和反应时作指标 ,进一步探讨视标亮度、反射眩光距离和反射眩光面积对视觉判读作业绩效的交互影响。2　实验方法2 1　实验任务本实验视觉作业为兰道环视标判读。兰道环外径为 5 2 5ｍｍ ,内径为 4 75ｍｍ ,环宽为 0 5ｍｍ ,兰道环缺口为 0 3 3ｍｍ ,缺口朝向分为“上”、“下”、“左”、“右”四个方向。实验中被试任务是在尽可能快的前提下 ,正确在判读兰道环的…     

知觉负载和线索位置对视觉选择性注意的影响

采用线索范式,以汉语双字词为材料,探讨了不同工作记忆负荷条件下知觉负载、线索位置对视觉选择性注意的影响.结果表明:(1)线索位置影响被试对目标的加工,前线索条件下被试对目标的加工更为精细;(2)知觉负载对选择性注意的影响受到工作记忆的调节.高工作记忆负荷条件下,高知觉负载条件下的反应时显著短于低知觉负载条件;而在低工作记忆负荷条件下,不同知觉负载条件下的反应时差异不显著.     

红光照明条件下VDT不同显示色的视觉效果比较

本研究以VDT上持续进行的视觉作业速度和眼的调节辐合时间作为指标,对红光照明条件下VDT显示的红、黄、绿、蓝、白五种字符色的视觉效果进行了比较.实验中,VDT背景光的主波长为630nm.结果表明,五种字符色在两项指标上均表现出显著差异;绿色显示的视觉效果最好,红色显示的效果最差,黄、白、蓝三色处于中间.     

液晶显示器上字符辨认效果与观察角度及字符大小的关系

本研究从工程心理学角度,探讨了有源矩阵液晶显示器上字符辨认效果与观察角度及字符大小的关系。实验结果表明：(1)液晶显示的字符辨认效果因观察角度不同而存在显著差异,无论是在水平方向上还是下视方向上,字符辨认错误率均随着观察角度的增大而先慢后快地上升;但相比之下,水平方向上观察角度变化的容许范围大于下视方向上的容许范围;(2)液晶显示器上字符辨认效果也受字符大小的影响,并且字符大小与观察角度之间存在着显著的交互作用;当观察角度较大时,可通过加大字符尺寸来提高视觉辨认效果。     

The Effects of Relaxation and Postural Training on External Perception: Improvement of Visual Acuity, Visual Field, and Hearing Acuity

This study examined the effects of muscular relaxation and postural training on external perception using a visual acuity test, a visual field test, and a hearing acuity test. Eighteen undergraduate students were randomly assigned to experimental and control groups. The experimental group underwent muscular relaxation and postural training. Each subject in this group was administered the tests before and after the training. Each subject in the control group carried out the tests before and after participating in a 30-min conversation with the experimenter. On all three tests, the experimental group improved significantly more than the control group.     

内隐绩效模型对绩效评估一致性的效应分析

本文在以往研究基础上,对评估者的内隐绩效模型进行了理论分析和实证研究。通过对上级、一级评估者的内隐绩效模型和对下级绩效评估的比较研究发现,上下级主估者的内隐绩效模型存在差异,并对绩效评估的一致性有重要的影响作用。本文还对内隐绩效模型的形成进行了探讨。     

分配注意与发音抑制对视觉工作记忆的影响

本研究通过两个实验考察了分配注意与发音抑制对视觉工作记忆再认能力的影响.结果表明,保持阶段的分配注意与编码阶段的分配注意相比,对视觉工作记忆成绩影响更大;双任务条件下,被试正确回忆言语刺激时,视觉作业的正确率高,而错误回忆言语刺激时,视觉作业的正确率会降低;发音抑制与视觉工作记忆成绩无关.     

Effects of Visual Information and Task Constraints on Intersegmental Coordination in Playground Swinging

The authors investigated how and to what extent visual information and associated task constraints are negotiated in the coordinative structure of playground swinging. Participants (N = 20) were invited to pump a swing from rest to a prescribed maximal amplitude under 4 conditions: normal vision, no vision, and 2 visual conditions involving explicit phasing constraints. In the latter conditions, participants were presented with a flow pattern consisting of a periodically expanding and contracting optical structure. They were instructed to phase the swing motion so that the forward turning point coincided with either the maximal size (enhanced optical flow) or the minimal size (reduced optical flow) of the presented flow pattern. Removal of visual information clearly influenced the swinging behavior, in that intersegmental coordination became more stereotyped, reflecting a general stiffening of the swinger. The conditions involving explicit phasing requirements also affected the coordination, but in an opposite way: The coordination became less stereotyped. The two phasing instructions had differential effects: The intersegmental coordination deviated more from normal swinging (i.e., without phasing constraints) when optical flow was enhanced than when it was reduced. Collectively, those findings show that visual information plays a formative role in the coordinative structure of swinging, in that variations of visual information and task constraints were accompanied by subtle yet noticeable changes in intersegmental coordination.     

基于空间和基于物体的选择注意在信号检测中的作用

先前的研究认为基于空间和基于物体的注意选择都是存在的,但是很少有研究探讨这两者的关系,即两者是存在交互作用还是单独作用的。因此本研究采用Egly等修正的线索提示实验范式,探讨基于物体和基于空间的注意选择机制在信号检测任务中的关系。实验采用2(两种物体)×2(两种空间)×3(有效线索、物体内无效线索和物体间无效线索)的被试内设计。16名大学生被试参加实验。结果表明:(1)对有效线索的反应快于无效线索,且物体内无效线索快于物体间无效线索;(2)在不同材料之间,两类无效线索反应时之差存在显著差异;(3)空间因素和物体因素的作用是独立的。结论提示:基于空间和基于物体的选择性注意都是存在的,且两者独立作用于注意的选择过程。     

某些影响儿童视觉写实绘画因素的实验研究

与Brenmer等(1997)的实验对照,对4～7岁的儿童考察观察角度的变化方式、模型状态、年龄等与其绘画简单深度关系中视觉写实水平的关系。实验结果表明：年龄是影响儿童绘画简单深度关系中视觉写实水平的重要因素;观察角度变化的两种方式在6～7岁组有显著差异;模型状态对不同性别儿童的绘画成绩影响显著。     

Effects of Performance Context on Processing Speed and Performance Ratings

The present study demonstrated that the presence of evaluatively polarized context performances not only produces contrast and halo effects on judgments of a target performance, but also causes judgments to be made much faster. Processing speed and positive halo were highly correlated, supporting the notion that halo in performance ratings results from raters' recall and use of a single, general impression. Furthermore, regression analyses demonstrated that processing speed mediates the relationship between context and halo. The relationship between these findings, halo, processing speed, and general impressions, as well as implications for performance appraisals, are discussed.     

Interaction of Tremor and Magnification in a Motor Performance Task With Visual Feedback

In this study, the interaction between increased gain in the visual feedback loop and motor control of the periphery was investigated. Participants (N = 15) were asked to maintain a constant finger position while they used magnified visual feedback. The measure of the accuracy of each trial was the standard deviation (trial error) of the finger position. Trials performed under magnification had lower trial errors than trials without magnification. The change in trial error between trials with and without magnification proved greater than the difference between trials at any 2 magnifications. In contrast, the differences between individual subjects were often greater than the differences between performances at individual magnifications. At higher magnifications, performance seemed to be limited by the tremor; the ratio of trial error to tremor intensity was constant. When applied to microsurgery, the present results accord with those found in earlier research, including investigations that have found that the level of magnification used in microsurgery is not the most significant factor in achieving good results and that tremor is the limiting factor in microsurgical tasks.