van Donkelaar Paul, Saavedra Sandy, Woollacott Marjorie
Department of Human Physiology and Institute of Neuroscience, University of Oregon, Eugene, Oregon 97403-1240, USA.
J Neurophysiol. 2007 Apr;97(4):3148-51. doi: 10.1152/jn.01339.2006. Epub 2007 Feb 7.
In this paper, we demonstrate that when a peripheral object is foveated by a sequence of multiple saccades, the initial saccade in the sequence is initiated markedly faster than a single accurate saccade to the same object. We suggest that multiple saccades represent a more automatic form of oculomotor planning that may be the result of a reduced influence from the cerebral cortex. To test this, we compared single and multiple saccade characteristics across development. We find that in contrast to the reduction in the latency of single saccades that is observed across development, the latency of initial saccades in multiple saccade sequences is remarkably stable across all age groups. Moreover, the longer the latency of this initial saccade, the more accurate it is, suggesting that there is a relation between the degree of procrastination and the accuracy of the response. Finally, the frequency with which multiple saccades occurred within each age group was positively correlated with the tendency to generate erroneous saccades during a fixation control task. Taken together, the present data suggest that multiple saccades are generated in a more automatic manner than single saccades.
在本文中，我们证明，当一个周边物体通过一系列多个扫视动作被注视时，该序列中的初始扫视动作比单次准确扫视到同一物体的动作启动得明显更快。我们认为，多个扫视动作代表了一种更自动的眼动计划形式，这可能是大脑皮层影响减弱的结果。为了验证这一点，我们比较了不同发育阶段的单次和多次扫视动作特征。我们发现，与在整个发育过程中观察到的单次扫视潜伏期缩短相反，多次扫视序列中初始扫视的潜伏期在所有年龄组中都非常稳定。此外，这个初始扫视的潜伏期越长，它就越准确，这表明延迟程度与反应准确性之间存在关联。最后，每个年龄组内多次扫视出现的频率与在固定控制任务中产生错误扫视的倾向呈正相关。综上所述，目前的数据表明，多个扫视动作的产生方式比单次扫视动作更具自动性。
