Defining the temporal threshold for ocular fixation in free-viewing visuocognitive tasks
Defining the temporal threshold for ocular fixation in free-viewing visuocognitive tasks
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DOI：
10.1016/s0165-0270(03)00151-1
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发表时间：
2003-09-30
影响因子：
3
通讯作者：
Gordon, E
中科院分区：
文献类型：
--
作者：
Manor, BR;Gordon, E
自由观看任务中的眼睛注视模式反映了视觉注意力和认知的各个方面。为了量化这些模式，必须通过应用明确的空间和时间阈值来识别原始眼动数据中的注视。200 INS的时间阈值通常用于临床视觉认知研究，尽管最初是从阅读中的眼球运动研究得出的。我们使用生物相关的(人脸)和抽象的(复杂的几何)刺激，系统地探索了200INS以下的时间注视阈值。通过增加注视次数和扫描路径长度，短注视(200ms)显著改变了对面部和几何刺激的注视的时空模式。100ms的阈值被发现能有效地将凝视与其他眼动活动区分开来，并与目前的生理和视觉认知模型一致。对每个受试者的注视持续时间数据的统计检验表明，与平均值相比，中位数是一种不那么偏颇、更可靠的中央倾向衡量标准。(C)2003爱思唯尔B.V.保留所有权利。
Patterns of ocular fixation in free-viewing tasks reflect aspects of visual attention and cognition. To quantify these patterns, fixations must be identified in raw eye movement data by applying explicit spatial and temporal thresholds. A temporal threshold of 200 ins is commonly used in clinical visuocognitive research, despite having been originally derived from a study of eye movements in reading. We systematically explored temporal fixation thresholds below 200 ins, using biologically relevant (human face) and abstract (complex geometric) stimuli. Short fixations ( < 200 ms) significantly altered spatiotemporal patterns of fixation for both the face and geometric stimuli, by increasing the number of fixations and the scanpath length. A threshold of 100 ms was found to discriminate fixations from other oculomotor activity effectively, and was consistent with current physiological and visuocognitive models. Statistical examination of fixation duration data for each subject suggested the median was a less biased and more robust measure of central tendency than the mean. (C) 2003 Elsevier B.V. All rights reserved.