Switch from ambient to focal processing mode explains the dynamics of free viewing eye movements.
Switch from ambient to focal processing mode explains the dynamics of free viewing eye movements.
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DOI：
10.1038/s41598-017-01076-w
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发表时间：
2017-04-24
影响因子：
4.6
通讯作者：
Grün S
中科院分区：
文献类型：
--
作者：
Ito J;Yamane Y;Suzuki M;Maldonado P;Fujita I;Tamura H;Grün S
以往的研究表明，人类在自由地观看自然场景时，会采用环境和焦点模式进行视觉探索。这两种模式的特点是基于眼球运动参数，如扫视幅度和固定时间，但没有任何视觉功能的观看场景。在这里，我们提出了一个新的表征眼睛运动在自由观看的基础上，眼睛是如何移动的视觉场景中的对象。我们将这种特性应用于从自由观察猕猴获得的数据。我们表明，基于这种特性的分析给出了一个直接的指示，从周围的焦点处理模式沿着自由观看探索的过程中的行为转变。我们进一步提出了一个随机模型的眼跳序列生成纳入两种处理模式之间的切换，定量再现的数据中观察到的行为特征。
Previous studies have reported that humans employ ambient and focal modes of visual exploration while they freely view natural scenes. These two modes have been characterized based on eye movement parameters such as saccade amplitude and fixation duration, but not by any visual features of the viewed scenes. Here we propose a new characterization of eye movements during free viewing based on how eyes are moved from and to objects in a visual scene. We applied this characterization to data obtained from freely-viewing macaque monkeys. We show that the analysis based on this characterization gives a direct indication of a behavioral shift from ambient to focal processing mode along the course of free viewing exploration. We further propose a stochastic model of saccade sequence generation incorporating a switch between the two processing modes, which quantitatively reproduces the behavioral features observed in the data.