Lesica Nicholas A, Boloori Alireza S, Stanley Garrett B
Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
Network. 2003 Feb;14(1):119-35.
In a natural setting, the mean luminance and contrast of the light within a visual neuron's receptive field are constantly changing as the eyes saccade across complex scenes. Adaptive mechanisms modulate filtering properties of the early visual pathway in response to these variations, allowing the system to maintain differential sensitivity to nonstationary stimuli. An adaptive variant of the reverse correlation technique is used to characterize these changes during single trials. Properties of the adaptive reverse correlation algorithm were investigated via simulation. Analysis of data collected from the mammalian visual system demonstrates the ability to continuously track adaptive changes in the encoding scheme. The adaptive estimation approach provides a framework for characterizing the role of adaptation in natural scene viewing.
在自然环境中，随着眼睛在复杂场景中进行扫视，视觉神经元感受野内光线的平均亮度和对比度不断变化。自适应机制会根据这些变化调节早期视觉通路的滤波特性，使系统能够对非平稳刺激保持差异敏感性。一种反向相关技术的自适应变体被用于在单次试验中表征这些变化。通过模拟研究了自适应反向相关算法的特性。对从哺乳动物视觉系统收集的数据进行分析，证明了该算法能够持续跟踪编码方案中的自适应变化。自适应估计方法为表征适应在自然场景视觉中的作用提供了一个框架。
