Mergenthaler Konstantin, Engbert Ralf
Helmholtz Center for Mind and Brain Dynamics, University of Potsdam, Potsdam, Germany.
Phys Rev Lett. 2007 Mar 30;98(13):138104. doi: 10.1103/PhysRevLett.98.138104. Epub 2007 Mar 29.
We propose a model for the control of fixational eye movements using time-delayed random walks. Fixational eye movements produce random displacements of the retinal image to prevent perceptual fading. First, we demonstrate that a transition from persistent to antipersistent correlations occurs in data recorded from a visual fixation task. Second, we propose and investigate a delayed random-walk model and get, by comparison of the transition points, an estimate of the neurophysiological delay. Differences between horizontal and vertical components of eye movements are found which can be explained neurophysiologically. Finally, we compare our numerical results with analytic approximations.
我们提出了一种使用时间延迟随机游走控制注视性眼动的模型。注视性眼动会使视网膜图像产生随机位移，以防止感知消退。首先，我们证明在视觉注视任务记录的数据中会出现从持续相关到反持续相关的转变。其次，我们提出并研究了一种延迟随机游走模型，并通过比较转变点得到神经生理延迟的估计值。我们发现眼动水平和垂直分量之间的差异可以从神经生理学角度进行解释。最后，我们将数值结果与解析近似值进行了比较。
