The relative contribution of noise and adaptation to competition during tri-stable motion perception
The relative contribution of noise and adaptation to competition during tri-stable motion perception
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DOI：
10.1167/16.15.6
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发表时间：
2016-12-01
影响因子：
1.8
通讯作者：
Masson, Guillaume S.
中科院分区：
文献类型：
--
作者：
Meso, Andrew Isaac;Rankin, James;Masson, Guillaume S.
动物利用对抗性相互作用进行感觉处理，这些相互作用可以引起竞争状态之间的振荡。周围的感觉输入产生了这种知觉的多稳定性。尽管许多实证研究使用双目竞争或格子图案运动，背后的驱动机制的替代品之间的自发过渡仍然不清楚。在目前的工作中，我们使用了一个三稳态的理发师极点运动刺激相结合的经验和建模方法来阐明的贡献，噪音和适应潜在的竞争。我们首先鲁棒地表征了过渡的感知报告和连续记录的眼睛方向之间的耦合，在按钮按下之前确定了480 ms的关键窗口，在该窗口内，这两种措施是最强相关的。其次，我们确定了一种新的刺激对比度和平均感知切换率之间的非单调关系，在较高的对比度温和减少之前，最初的上升率。神经领域模型的基础动力学在以前的理论工作，并将噪声和适应机制进行了调整，扩展，并进行了实证验证。噪声和适应的贡献被证实占主导地位，在较低和较高的对比度，分别。模型模拟，有两个自由参数控制适应动态和方向阈值，捕捉到参与者的测量平均过渡率。我们验证了从噪声为主的适应驱动的眼睛方向分布和过渡持续时间统计的转变。这项工作结合了建模和经验证据，以证明在三稳态噪声和适应之间的信号强度依赖的相互作用。我们建议，研究结果概括超出了理发师极刺激的情况下，在连续的特征空间模糊的感知。
Animals exploit antagonistic interactions for sensory processing and these can cause oscillations between competing states. Ambiguous sensory inputs yield such perceptual multistability. Despite numerous empirical studies using binocular rivalry or plaid pattern motion, the driving mechanisms behind the spontaneous transitions between alternatives remain unclear. In the current work, we used a tristable barber pole motion stimulus combining empirical and modeling approaches to elucidate the contributions of noise and adaptation to underlying competition. We first robustly characterized the coupling between perceptual reports of transitions and continuously recorded eye direction, identifying a critical window of 480 ms before button presses, within which both measures were most strongly correlated. Second, we identified a novel nonmonotonic relationship between stimulus contrast and average perceptual switching rate with an initially rising rate before a gentle reduction at higher contrasts. A neural fields model of the underlying dynamics introduced in previous theoretical work and incorporating noise and adaptation mechanisms was adapted, extended, and empirically validated. Noise and adaptation contributions were confirmed to dominate at the lower and higher contrasts, respectively. Model simulations, with two free parameters controlling adaptation dynamics and direction thresholds, captured the measured mean transition rates for participants. We verified the shift from noise-dominated toward adaptation-driven in both the eye direction distributions and intertransition duration statistics. This work combines modeling and empirical evidence to demonstrate the signal-strength-dependent interplay between noise and adaptation during tristability. We propose that the findings generalize beyond the barber pole stimulus case to ambiguous perception in continuous feature spaces.