基于平滑跟踪眼动的认知机制的研究

发布时间：2018-04-18 17:40

本文选题：平滑跟踪眼动 + 跟踪效果　；参考：《电子科技大学》2012年硕士论文

【摘要】：本文主要研究平滑跟踪眼动的认知机制，主要包含两个方面的内容。第一，在不同跟踪目标速度条件下，研究眼睛的跟踪效果和对呈现在目标外周的刺激的识别效果，探索二者的内在联系，揭示平滑跟踪条件下的速度变化与注意分配的关系；第二，研究平滑跟踪过程中瞳孔的变化趋势，解密平滑跟踪眼动过程中导致瞳孔收获和扩张的原因。研究结果表明：眼睛的跟踪效果随着跟踪目标速度增大而下降，刺激的识别率也随着目标速度的增大而降低，而且这两个参数在速度为20deg/s和25deg/s之间发生急剧变化。研究结果表明，平滑跟踪眼动的过程中存在水平与垂直方向的各向异性，当速度低于20deg/s时各向异性效果显著。另外，本研究中水平方向的刺激在跟踪目标前和跟踪目标后的识别效果没有差异，通过仔细研究眼睛滞后和超前跟踪目标时检测刺激出现在跟踪目标前和跟踪目标后的识别率，我们发现平滑跟踪眼动过程中注意分配确实偏好于跟踪目标的前方，但是由于注意的空间分配参与作用导致了总体目标前和后的识别率没有差异。根据跟踪效果和识别效果的研究结果表明，20deg/s是研究平滑跟踪眼动的速度上限。平滑跟踪眼动的过程中，视觉刺激触发眼睛瞳孔使其发生了两次急剧的变化。第一次是瞳孔收缩，发生在跟踪目标呈现之后；第二次是瞳孔扩张，，发生在识别任务闪现之后。研究证明：第一，瞳孔收缩是由于眼睛搜索到跟踪目标之后对目标的准确定位导致的；第二，刺激出现后瞳孔的扩张是视觉识别任务导致的。根据研究结果，瞳孔的变化参数可以用来监测平滑跟踪眼动过程中被试者是否认真执行相应的视觉任务。
[Abstract]:This paper mainly studies the cognitive mechanism of smooth tracking eye movement, mainly includes two aspects.First, under different tracking speed conditions, we study the eye tracking effect and the recognition effect of the stimuli presented around the target, explore the internal relationship between the two, and reveal the relationship between the speed change and the attention allocation under the condition of smooth tracking.Secondly, the change trend of pupil in smooth tracking process is studied.The results show that the eye tracking effect decreases with the increase of the target velocity, and the recognition rate of the stimulus decreases with the increase of the target velocity, and the two parameters vary sharply between the velocity of 20deg/s and 25deg/s.The results show that there are horizontal and vertical anisotropy in the smooth tracking eye movement, and the anisotropy effect is obvious when the velocity is lower than 20deg/s.In addition, there is no difference in the recognition effect of the horizontal direction stimulus before and after tracking the target. The recognition rate of the stimulus appearing before and after tracking the target is studied carefully when the eye is lagging behind and the target is tracked ahead.It is found that attention allocation in smooth eye tracking does favor the front of the target, but due to the participation of spatial allocation of attention, there is no difference in the recognition rates before and after the overall target.According to the research results of tracking effect and recognition effect, it is shown that 20degs is the upper limit of the speed of eye movement in smooth tracking.During smooth eye tracking, visual stimuli trigger eye pupils to undergo two sharp changes.The first is pupil constriction, which occurs after the target is followed, and the second is pupil dilatation, which occurs after the recognition task flashes.The results show that: first, pupil constriction is caused by the accurate location of the target after the eye searches the tracking target; second, the dilation of the pupil after stimulation is caused by the task of visual recognition.According to the results of the study, the parameters of pupil changes can be used to monitor whether the subjects perform the corresponding visual tasks seriously during the smooth tracking eye movement.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.0

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