Hooge I T, Frens M A
Department of Physiology, Erasmus University Rotterdam, PO Box 1738, 3000 DR, Rotterdam, The Netherlands.
Vision Res. 2000;40(24):3415-26. doi: 10.1016/s0042-6989(00)00184-x.
Tasks such as reading or visual search consist of series of saccades. We have investigated to what extent saccades that are made within a series of self-paced movements are influenced by preceding movements. The present paper concerns an analysis of the duration of the fixations preceding saccades. We tested human subjects in a paradigm where they had to fixate two to four targets in a fixed order as fast as they could. We found that fixations before so-called 'return saccades' (saccades returning to the previously fixated position) are considerably longer (up to 40%) than other fixations. This phenomenon, which we call 'Inhibition of Saccade Return' (ISR), is present when return and regular saccades are mixed in one trial, and seems to be reset after each saccade. ISR is strongest at the previously fixated target, and decreases gradually from there. The radius of the area where ISR is found is about 4 degrees. The relation between ISR and 'Inhibition of Return' of spatial attention [Posner & Cohen, 1984] is discussed, as well as the neurophysiological basis of ISR.
诸如阅读或视觉搜索等任务是由一系列扫视组成的。我们已经研究了在一系列自主节奏运动中所做的扫视在多大程度上受到先前运动的影响。本文关注对扫视之前注视持续时间的分析。我们在一种范式中对人类受试者进行了测试，在该范式中他们必须尽快按照固定顺序注视两到四个目标。我们发现，在所谓的“返回扫视”（回到先前注视位置的扫视）之前的注视时间比其他注视时间长得多（高达40%）。这种现象，我们称之为“扫视返回抑制”（ISR），当返回扫视和常规扫视在一次试验中混合出现时就会出现，并且似乎在每次扫视后都会重置。ISR在先前注视的目标处最强，并从那里逐渐减弱。发现ISR的区域半径约为4度。本文讨论了ISR与空间注意力的“返回抑制”[波斯纳和科恩，1984]之间的关系，以及ISR的神经生理学基础。
