Podladchikova Lubov N, Shaposhnikov Dmitry G, Koltunova Tatiana I, Dyachenko Anna V, Gusakova Valentina I
A. B. Kogan Research Institute for Neurocybernetics, Southern Federal University, 194/1, Stachki Ave., Rostov-on-Don, 344090, Russia.
J Integr Neurosci. 2009 Dec;8(4):487-501.
The prospective goal of our study is a quantitative estimation of the contribution of various factors and mechanisms during image viewing. In this paper, experimental data about temporal dynamics of eye movement parameters and viewing trajectory are considered. Three images were presented to each subject (n = 12) under two experimental conditions: "free viewing of initial images" and "search for modified regions in previously presented images". Averaged fixation duration and saccade amplitude, as well as type of viewing trajectory were determined in each consequent period of trials having 30 fixation points. Viewing trajectories were classified into three types: (1) scanning, (2) grouped, and (3) mixed. In spite of individual variations (subject and image), several common peculiarities of temporal dynamics of image viewing were revealed. Specifically: (i) fixation duration in the first and last trial periods were less than during the second one; (ii) saccade amplitude had opposite dynamics; (iii) the scanning trajectories dominated in the first and last periods as compared with the second one; (iv) the mixed and grouped trajectories are more pronounced in the second period; (v) independent of their temporal consequence, the periods with maximal fixation duration differed from those with minimal duration by saccade amplitude and dominating viewing trajectories.
我们研究的预期目标是对图像观看过程中各种因素和机制的贡献进行定量估计。本文考虑了有关眼动参数和观看轨迹的时间动态的实验数据。在两种实验条件下，向每个受试者（n = 12）呈现了三张图像：“初始图像的自由观看”和“在先前呈现的图像中搜索修改区域”。在每个包含30个注视点的后续试验周期中，确定平均注视持续时间和扫视幅度以及观看轨迹的类型。观看轨迹分为三种类型：（1）扫描型，（2）分组型，（3）混合型。尽管存在个体差异（受试者和图像），但仍揭示了图像观看时间动态的几个共同特点。具体而言：（i）第一个和最后一个试验周期的注视持续时间短于第二个试验周期；（ii）扫视幅度呈现相反的动态变化；（iii）与第二个周期相比，扫描轨迹在第一个和最后一个周期中占主导地位；（iv）混合轨迹和分组轨迹在第二个周期中更为明显；（v）无论其时间顺序如何，具有最大注视持续时间的周期与具有最小持续时间的周期在扫视幅度和主导观看轨迹方面存在差异。
