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首页> 外文期刊>The European Journal of Neuroscience >Directional responses of visual wulst neurones to grating and plaid patterns in the awake owl.
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Directional responses of visual wulst neurones to grating and plaid patterns in the awake owl.

机译：视觉狼w神经元对醒着的猫头鹰的格子和格子图案的定向响应。

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The avian retinothalamofugal pathway reaches the telencephalon in an area known as visual wulst. A close functional analogy between this area and the early visual cortex of mammals has been established in owls. The goal of the present study was to assess quantitatively the directional selectivity and motion integration capability of visual wulst neurones, aspects that have not been previously investigated. We recorded extracellularly from a total of 101 cells in awake burrowing owls. From this sample, 88% of the units exhibited modulated directional responses to sinusoidal gratings, with a mean direction index of 0.74 +/- 0.03 and tuning bandwidth of 28 +/- 1.16 degrees . A direction index higher than 0.5 was observed in 66% of the cells, thereby qualifying them as direction selective. Motion integration was tested with moving plaids, made by adding two sinusoidal gratings of different orientations. We found that 80% of direction-selective cells responded optimally to the motion direction of the component gratings, whereas none responded to the global motion of plaids, whose direction was intermediate to that of the gratings. The remaining 20% were unclassifiable. The strength of component motion selectivity rapidly increased over a 200 ms period following stimulus onset, maintaining a relatively sustained profile thereafter. Overall, our data suggest that, as in the mammalian primary visual cortex, the visual wulst neurones of owls signal the local orientated features of a moving object. How and where these potentially ambiguous signals are integrated in the owl brain might be important for understanding the mechanisms underlying global motion perception.
机译：禽视网膜黄褐斑途径在称为视觉肠的区域到达端脑。在猫头鹰中已经建立了该区域与哺乳动物早期视觉皮层之间的紧密功能类比。本研究的目的是定量评估视觉沃尔特神经元的方向选择性和运动整合能力，这是以前没有研究过的方面。我们从醒来的穴居猫头鹰中总共101个细胞的细胞外记录。从该样本中，有88％的单元显示出对正弦光栅的调制方向响应，平均方向指数为0.74 +/- 0.03，调谐带宽为28 +/- 1.16度。在66％的细胞中观察到高于0.5的方向指数，从而使其具有方向选择性。通过添加两个不同方向的正弦光栅制成的移动格子，对运动集成进行了测试。我们发现80％的方向选择单元对组件光栅的运动方向有最佳响应，而没有一个对格子方向的整体运动做出响应，而格子的总体方向是中间方向。其余20％无法分类。刺激开始后的200毫秒内，零件运动选择性的强度迅速提高，此后保持相对持续的轮廓。总体而言，我们的数据表明，如同在哺乳动物的初级视觉皮层中一样，猫头鹰的视觉异常神经元发出信号表示运动物体的局部定向特征。这些潜在的模棱两可的信号如何以及在猫头鹰大脑中的整合位置对于理解整体运动感知的机制可能很重要。

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