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首页> 外文会议>WSEAS International Conference on Mathematical Biology and Ecology >Differential retinal localisation of pathways for pattern and movement in rabbit vision
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Differential retinal localisation of pathways for pattern and movement in rabbit vision

机译：兔视力模式和运动的差异视网膜定位

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The rabbit eye has 397,000 retinal ganglion cells compared with the cat that has 193,000. Despite this, pattern acuity in the rabbit is inferior, 4Hz compared to 6Hz in the cat. This is probably due to the smaller proportion of uncrossed fibres in the rabbit, which has only 39,700 uncrossed fibres to the cat's 77,200. The most conspicuous feature of the rabbit retina is the visual streak which extends along the horizontal azimuth from the nasal margin to the temporal limit of the retina, where there is an upward expansion. We believe the parallel portion of the streak processes movement detection; and that the temporal anakatabatic area (area centralis) is responsible for pattern perception. Both anatomical and behavioural experiments were used to test this possibility. The visual capacity of both normal and chiasma rabbits were compared for differential sensitivity to either pattern or movement vision. The injection of HRP into the vitreal chamber of one eye of normal rabbits revealed extensive uptake throughout the contralateral thalamus. In the ipsilateral thalamus there was uptake solely from the ipsilateral retinal projection to a restricted wafer of the lateral geniculate nucleus (LGN). The same area on the contralateral side showed no HRP uptake. The chiasma cut rabbits showed a very different distribution of HRP in the thalamus. The uptake was restricted a thin wafer of the LGN, with no contralateral uptake. Thus the thalamic projections from the retinal area centralis were strictly segregated from the thalamic target areas for the visual streak without any overlap. Comparing the visual capacity of the normal and chiasma sectioned rabbits revealed both to have the same visual acuity Using OKN as a measure of movement detection, normal rabbits showed both a directional and velocity tuned response. The chiasma sectioned rabbits, with only uncrossed fibre projections remaining, showed a total loss of OKN, additionally the visual component of the VOR was also absent. Chiasma sectioned rabbits also showed a complete loss of conditioned NM responses. These findings provide strong evidence for anatomically separate pathways for pattern and movement vision in the rabbit. In addition the movement pathways are necessary for occulomotor control of such reflexes as OKN, VOR and NM anticipatory responses.
机译：与拥有193,000只的猫相比，兔眼有397,000个视网膜神经节细胞。尽管如此，兔子中的图案敏锐度较差，4Hz与猫中的6Hz相比。这可能是由于兔子在兔子中未交叉的纤维比例较小，这对于猫的77,200只有39,700名无交叉的纤维。兔子视网膜中最显着的特征是视觉条纹，其沿水平方位角从鼻缘延伸到视网膜的时间限制，其中有向上膨胀。我们认为条纹工艺的平行部分运动检测;并且时间匿名区域（区域中心）负责模式感知。解剖和行为实验都用于测试这种可能性。将正常和Chiasma兔的视觉能力进行比较，以差动敏感性与模式或运动视觉。将HRP注入普通兔的一只眼睛的蒸质室中显示出在整个对侧丘脑的广泛摄取。在同侧丘脑中，仅从IpsilAtalal视网膜投影到横向核素核（LGN）的限制晶片上摄取。对侧侧的相同区域显示没有HRP吸收。 Chiasma Cut Rabbits在丘脑中表现出非常不同的HRP分布。吸收被限制为LGN的薄晶片，没有对侧摄取。因此，来自视网膜区域中心的丘脑突起严格地从丘陵靶区域被严格地隔离，用于视觉条纹而没有任何重叠。比较正常和赤腰切片兔的可视能力，显示使用OKN具有相同的视极度作为运动检测的量度，普通兔子显示了方向和速度调谐响应。 Chiasma切片兔，只有未交叉的光纤投影剩余，显示出OKN的总损失，另外，VOR的视觉组件也不存在。 Chiasma切片兔也表现出完全的条件NM反应损失。这些发现为兔子的模式和运动视觉进行了解剖学分离的途径提供了强有力的证据。此外，运动途径对于OKN，VOR和NM预期反应的这种反应是必需的。

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