Effects of Time-Dependent Stimuli in a Competitive Neural Network Model of Perceptual Rivalry
Effects of Time-Dependent Stimuli in a Competitive Neural Network Model of Perceptual Rivalry
复制标题
知觉竞争的竞争性神经网络模型中时间相关刺激的影响
DOI：
10.1007/s11538-012-9718-0
复制
发表时间：
2012
影响因子：
3.5
通讯作者：
Z. Kilpatrick
中科院分区：
文献类型：
--
作者：
Suren Jayasuriya;Z. Kilpatrick
我们分析了接收时变输入的感知竞争的竞争性神经网络模型。输入的时间依赖性可以是离散的或平滑的。尖峰频率自适应提供负反馈，当输入在时间上恒定时会产生网络振荡。类似于知觉竞争的振荡涉及一次仅一个群体处于“开启”状态，这代表一次单一知觉的主导地位。正如 Laing 和 Chow (J. Comput. Neurosci. 12(1):39-53, 2002) 所示，对于足够高的对比度，我们可以得出与 Levelt 的命题一致的优势时间和对比度之间的关系（Levelt 中的《论双眼竞争》，1965）。与时间相关的刺激会引起新的网络振荡，其中两个、一个或两个群体在任何给定时间都处于“开启”状态。当单个群体接受中断的刺激时，我们发现的基本行为模式是锁相，即时间驱动的群体将其状态锁定到刺激。其他行为被分析为这种强迫振荡的分叉，使用利用慢速适应时间尺度的快/慢分析。当两个群体都接收时变输入时，我们发现融合和单一群体优势的混合，并且我们将参数空间划分为特定的振荡类型。最后，当单个群体的输入对比度随时间平滑变化时，通过锁相之外的周期添加分岔出现 1:n 锁模状态。我们的结果为未来感知竞争的心理物理学实验提供了几个可测试的预测。
We analyze a competitive neural network model of perceptual rivalry that receives time-varying inputs. Time-dependence of inputs can be discrete or smooth. Spike frequency adaptation provides negative feedback that generates network oscillations when inputs are constant in time. Oscillations that resemble perceptual rivalry involve only one population being “ON” at a time, which represents the dominance of a single percept at a time. As shown in Laing and Chow (J. Comput. Neurosci. 12(1):39–53, 2002), for sufficiently high contrast, one can derive relationships between dominance times and contrast that agree with Levelt’s propositions (Levelt in On binocular rivalry, 1965). Time-dependent stimuli give rise to novel network oscillations where both, one, or neither populations are “ON” at any given time. When a single population receives an interrupted stimulus, the fundamental mode of behavior we find is phase-locking, where the temporally driven population locks its state to the stimulus. Other behaviors are analyzed as bifurcations from this forced oscillation, using fast/slow analysis that exploits the slow timescale of adaptation. When both populations receive time-varying input, we find mixtures of fusion and sole population dominance, and we partition parameter space into particular oscillation types. Finally, when a single population’s input contrast is smoothly varied in time, 1:n mode-locked states arise through period-adding bifurcations beyond phase-locking. Our results provide several testable predictions for future psychophysical experiments on perceptual rivalry.
影响因子：
1.8
作者：
Webster MA
通讯作者：
Webster MA
影响因子：
1.8
作者：
Kang,Min-Suk;Heeger,David;Blake,Randolph
通讯作者：
Blake,Randolph