论文标题
在视觉搜索任务执行过程中控制固定持续时间
Control of fixation duration during visual search task execution
论文作者
论文摘要
我们研究人类观察者在执行视觉搜索任务期间控制固定持续时间的能力。我们用自然和合成图像进行了眼神追踪实验，发现固定持续时间对任务难度以及前一个和后续扫视的长度的依赖性。为了解释这一点，我们开发了人类眼动的新型控制模型，该模型结合了信仰状态的连续时间决策，观察和更新。该模型基于部分可观察到的马尔可夫决策过程，其观察值延迟和扫视执行，这些执行是眼睛和皮层之间延迟的延迟。我们通过比较模拟和实验性眼动轨迹的统计特性来验证计算模型。
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.
