Spatiotemporal frequency and speed tuning in the owl visual wulst
Spatiotemporal frequency and speed tuning in the owl visual wulst
复制标题
猫头鹰视觉乌尔斯特的时空频率和速度调整
DOI：
10.1111/j.1460-9568.2009.06918.x
复制
发表时间：
2009
影响因子：
3.4
通讯作者：
Jerome Baron
中科院分区：
文献类型：
--
作者：
L. Pinto;Jerome Baron
鸟类的视觉wulst是hodologically相当于哺乳动物的初级视觉皮层（V1）。与大多数鸟类不同，猫头鹰有一个巨大的视觉wulst，与V1有着惊人的功能相似性。为了更好地了解运动是如何在这个区域内处理，我们使用正弦光栅的时空频率和速度调谐配置文件的131个神经元记录从清醒的穴居猫头鹰的特征。研究人员发现，这些细胞能够清楚地对空间和时间频率进行调谐，并且在某种程度上与灵长类动物和食肉动物的纹状皮层中所报道的相似。我们的研究结果还表明，在wulst空间频率调谐域的存在。速度调谐评估了几种方法设计来衡量空间和时间频率调谐之间的依赖程度。尽管许多神经元被发现是独立调节的，但很大一部分细胞至少表现出一定程度的依赖性，这与猫头鹰正在进行某种初始转化以明确表示速度的想法是一致的。有趣的是，在一定的约束条件下，通过结合我们的实验测量的响应，使用最近的速度调谐皮质模型，获得了更高的空间频率不变的速度调谐配置文件的发生率。总的来说，我们的研究结果加强了这样一个概念，即像V1一样，猫头鹰wulst是运动处理的重要初始阶段，这一功能通常归因于侧眼鸟类的离顶盖通路区域。
The avian visual wulst is hodologically equivalent to the mammalian primary visual cortex (V1). In contrast to most birds, owls have a massive visual wulst, which shares striking functional similarities with V1. To provide a better understanding of how motion is processed within this area, we used sinusoidal gratings to characterize the spatiotemporal frequency and speed tuning profiles of 131 neurones recorded from awake burrowing owls. Cells were found to be clearly tuned to both spatial and temporal frequencies, and in a way that is similar to what has been reported in the striate cortex of primates and carnivores. Our results also suggest the presence of spatial frequency tuning domains in the wulst. Speed tuning was assessed by several methods devised to measure the degree of dependence between spatial and temporal frequency tuning. Although many neurones were found to be independently tuned, a significant proportion of cells showed at least some degree of dependence, compatible with the idea that some kind of initial transformation towards an explicit representation of speed is being carried out by the owl wulst. Interestingly, under certain constraints, a higher incidence of spatial frequency‐invariant speed tuned profiles was obtained by combining our experimentally measured responses using a recent cortical model of speed tuning. Overall, our findings reinforce the notion that, like V1, the owl wulst is an important initial stage for motion processing, a function that is usually attributed to areas of the tectofugal pathway in lateral‐eyed birds.
影响因子：
2.5
作者：
Moore, BD;Alitto, HJ;Usrey, WM
通讯作者：
Usrey, WM
影响因子：
2.5
作者：
LEVITT, JB;KIPER, DC;MOVSHON, JA
通讯作者：
MOVSHON, JA
影响因子：
5.5
作者：
FOSTER, KH;GASKA, JP;POLLEN, DA
通讯作者：
POLLEN, DA