Sequences of predictive eye movements form a fractional Brownian series--implications for self-organized criticality in the oculomotor system.
Sequences of predictive eye movements form a fractional Brownian series--implications for self-organized criticality in the oculomotor system.
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预测性眼球运动序列形成了分数布朗序列——这对动眼神经系统的自组织临界性有影响。
DOI：
10.1007/s00422-005-0584-9
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Shelhamer,Mark
中科院分区：
文献类型：
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作者：
Shelhamer,Mark
当人类受试者看到一对周期性交替的视觉目标时，他们会用快速的眼球运动（称为扫视）来跟踪目标。在以前的工作中，我们证明了在低起搏频率（<0.5 Hz）下，扫视的潜伏期约为180 ms，并且潜伏期在试验之间不相关。在高起搏频率（>0.6 Hz）下，潜伏期要短得多：受试者进行预测性扫视，预测目标运动。预测的延迟是相关的，似乎形成一个分数布朗运动。在这里，我们证实了这一发现，通过检查的衰减率的非线性预测预测的预测性laerosity。我们通过使用去趋势波动分析和替代数据进一步表征预测性眼跳延迟的性质。这些结果使我们得出结论，预测性扫视可能表现出一种形式的自组织临界性，这使得快速响应刺激时间的变化。我们提供了一个实验演示。
When human subjects are presented with a pair of visual targets that alternate periodically, they track the targets with rapid eye movements known as saccades. In previous work we demonstrated that at low pacing rates (<0.5 Hz), saccades have a latency of about 180 ms, and the latencies are uncorrelated from trial to trial. At high pacing rates (>0.6 Hz), latencies are much shorter: subjects make predictive saccades that anticipate target motion. The predictive latencies are correlated and appear to form a fractional Brownian motion. Here we confirm this finding by examining the rate of decay of nonlinear forecasting of predictive latencies. We further characterize the nature of predictive saccade latencies through the use of detrended fluctuation analysis and surrogate data. These results lead us to conclude that predictive saccades may exhibit a form of self-organized criticality, which enables rapid response to changes in stimulus timing. We provide an experimental demonstration of this.