Keech T D, Resca L
Physics Department, Catholic University of America, Washington, DC 20064, USA.
Atten Percept Psychophys. 2010 Jan;72(1):114-41. doi: 10.3758/APP.72.1.114.
We relate the roles of attention, memory, and spatial constraints to pattern formation in eye movement trajectories previously measured in a conjunctive visual search task. Autocorrelations and power spectra of saccade direction cosines confirm a bias to progress forwardly, while turning at the display boundaries, plus a long-range memory component for the search path. Analyses of certain measures of circulation and imbalance in the eye trajectories, and their relations with the display area correspondingly subtended, bear signatures of spiraling or circulating patterns. We interpret their prevalence as mainly due to the interactions between three basic psychoneural mechanisms (conspicuity area, forward bias, long-range memory) and two task-specific geometric-spatial constraints on the eye trajectories (central start and display confinement). Conversely, computer simulations of random walks in which all psychoneural mechanisms are eliminated, while geometric-spatial constraints are maintained, show no prevalence of circulating patterns by those measures. We did find certain peculiarities of some individual participants in their pattern selections, but they appear too casual and incidental to suggest more systematic or complex search strategies in our randomized displays of uninformative stimuli.
我们将注意力、记忆和空间限制的作用与先前在联合视觉搜索任务中测量的眼动轨迹中的模式形成联系起来。扫视方向余弦的自相关和功率谱证实了在显示边界处转弯时向前推进的偏向，以及搜索路径的长程记忆成分。对眼轨迹中某些循环和不平衡度量的分析，以及它们与相应所对显示区域的关系，呈现出螺旋或循环模式的特征。我们将它们的普遍存在主要解释为三种基本心理神经机制（显著性区域、向前偏向、长程记忆）与眼轨迹上两个特定任务的几何空间限制（中央起始和显示限制）之间相互作用的结果。相反，在消除所有心理神经机制而保持几何空间限制的随机游走计算机模拟中，通过这些度量未显示出循环模式的普遍存在。我们确实发现一些个体参与者在模式选择上有某些特点，但在我们无信息刺激的随机显示中，这些特点显得过于随意和偶然，无法表明更系统或复杂的搜索策略。
