Persistence in eye movement during visual search.
Persistence in eye movement during visual search.
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DOI：
10.1038/srep20815
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发表时间：
2016-02-11
影响因子：
4.6
通讯作者：
Andrade JS Jr
中科院分区：
文献类型：
--
作者：
Amor TA;Reis SD;Campos D;Herrmann HJ;Andrade JS Jr
与任何认知任务一样，视觉搜索涉及许多无法直接观察和测量的潜在过程。通过这种方式，眼睛的运动无疑代表了我们能够获得的与控制这种认知活动的内部机制最明确和最密切的联系。在这里，我们展示了视觉搜索期间的眼球运动过程，由插入眼跳的注视序列组成，表现出独特的持久行为。最初，通过关注扫视方向和扫视间角度，我们发现这些度量的概率分布表明参与者对类似阅读的机制（几何持久性）有明显的偏好，并讨论了其特征和搜索/觅食的潜在优势。然后，我们对眼轨迹中跳跃幅度的时间序列进行多重分形去趋势波动分析（MF-DFA），发现它表现出由扫视和注视的顺序组合产生的典型多重分形行为。通过检查仅由注视运动组成的时间序列，我们的结果揭示了具有赫斯特指数的单分形行为，这表明存在长程幂律正相关性（统计持久性）。我们期望我们的方法可以被采用作为理解视觉搜索过程中的持久性和策略规划的一种方式。
As any cognitive task, visual search involves a number of underlying processes that cannot be directly observed and measured. In this way, the movement of the eyes certainly represents the most explicit and closest connection we can get to the inner mechanisms governing this cognitive activity. Here we show that the process of eye movement during visual search, consisting of sequences of fixations intercalated by saccades, exhibits distinctive persistent behaviors. Initially, by focusing on saccadic directions and intersaccadic angles, we disclose that the probability distributions of these measures show a clear preference of participants towards a reading-like mechanism (geometrical persistence), whose features and potential advantages for searching/foraging are discussed. We then perform a Multifractal Detrended Fluctuation Analysis (MF-DFA) over the time series of jump magnitudes in the eye trajectory and find that it exhibits a typical multifractal behavior arising from the sequential combination of saccades and fixations. By inspecting the time series composed of only fixational movements, our results reveal instead a monofractal behavior with a Hurst exponent , which indicates the presence of long-range power-law positive correlations (statistical persistence). We expect that our methodological approach can be adopted as a way to understand persistence and strategy-planning during visual search.