视觉搜索任务执行过程中注视持续时间的控制
Control of fixation duration during visual search task execution
摘要：
我们研究了人类观察者在执行视觉搜索任务时控制注视持续时间的能力。我们进行了自然和合成图像的眼动跟踪实验，发现固定时间的依赖性的任务的难度和长度的前，后眼跳。为了解释这一点，我们开发了一种新颖的人眼运动控制模型，该模型结合了连续时间决策、观察和信念状态更新。该模型基于部分可观察马尔可夫决策过程，具有观察延迟和扫视执行，该扫视执行解释了眼睛和皮层之间的延迟。我们通过比较模拟和实验眼动轨迹的统计特性来验证计算模型。
英文摘要：
We study the ability of human observer to control fixation duration during execution of visual search tasks. We conducted the eye-tracking experiments with natural and synthetic images and found the dependency of fixation duration on difficulty of the task and the lengths of preceding and succeeding saccades. In order to explain it, we developed the novel control model of human eye-movements that incorporates continuous-time decision making, observation and update of belief state. This model is based on Partially Observable Markov Decision Process with delay in observation and saccade execution that accounts for a delay between eye and cortex. We validated the computational model through comparison of statistical properties of simulated and experimental eye-movement trajectories.
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