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首页> 外文期刊>Journal of Neurophysiology >Effects of optic flow in motor cortex and area 7a.
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Effects of optic flow in motor cortex and area 7a.

机译：运动皮层和区域7a中光流的影响。

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Moving visual stimuli were presented to behaving monkeys who fixated their eyes and did not move their arm. The stimuli consisted of random dots moving coherently in eight different kinds of motion (right, left, up, downward, expansion, contraction, clockwise, and counterclockwise) and were presented in 25 square patches on a liquid crystal display projection screen. Neuronal activity in the arm area of the motor cortex and area 7a was significantly influenced by the visual stimulation, as assessed using an ANOVA. The percentage of cells with a statistically significant effect of visual stimulation was 3 times greater in area 7a (370/587, 63%) than in motor cortex (148/693, 21.4%). With respect to stimulus properties, its location and kind of motion had differential effects on cell activity in the two areas. Specifically, the percentage of cells with a significant stimulus location effect was approximately 2.5 times higher in area 7a (311/370, 84%) than in motor cortex (48/148, 32.4%), whereas the percentage of cells with a significant stimulus motion effect was approximately 2 times higher in the motor cortex (79/148, 53.4%) than in area 7a (102/370, 27.6%). We also assessed the selectivity of responses to particular stimulus motions using a Poisson train analysis and determined the percentage of cells that showed activation in only one stimulus condition. This percentage was 2 times higher in the motor cortex (73.7%) than in area 7a (37.7%). Of all kinds of stimulus motion tested, responses to expanding optic flow were the strongest in both cortical areas. Finally, we compared the activation of motor cortical cells during visual stimulation to that observed during force exertion in a center --> out task. Of 514 cells analyzed for both the motor and visual tasks, 388 (75.5%) showed a significant relation to either or both tasks, as follows: 284/388 (73.2%) cells showed a significant relation only to the motor task, 27/388 (7%) cells showed a significant relation only to the visual task, whereas the remaining 77/388 (19.8%) cells showed significant relations to both tasks. Therefore a total of 361/514 (70.2%) cells were related to the motor task and 104/514 (20.2%) were related to the visual task. Finally, with respect to receptive fields (RFs), there was no clear visual receptive field structure in the motor cortical neuronal responses, in contrast to area 7a where RFs were present and could be modulated by the type of optic flow stimulus.
机译：运动的视觉刺激被呈现给行为灵巧的猴子，这些猴子固定眼睛并且不移动手臂。刺激由随机点组成，这些随机点以八种不同的运动（向右，向左，向上，向下，扩展，收缩，顺时针和逆时针）连贯地运动，并以25个正方形的块状形式呈现在液晶显示器的投影屏幕上。如使用ANOVA评估的那样，视觉刺激显着影响运动皮质的臂区域和区域7a中的神经元活动。在7a区（370/587，63％），具有视觉刺激统计学意义的细胞百分比是运动皮层（148/693，21.4％）的3倍。关于刺激特性，其位置和运动种类对这两个区域的细胞活动具有不同的影响。具体而言，具有显着刺激定位作用的细胞百分比在区域7a（311/370，84％）中大约是运动皮层（48/148，32.4％）的2.5倍，而具有显着刺激的细胞百分比运动皮层（79 / 148，53.4％）的运动效果大约是区域7a（102/370，27.6％）的2倍。我们还使用泊松训练分析评估了对特定刺激运动的响应的选择性，并确定了仅在一种刺激条件下显示激活的细胞百分比。该百分比在运动皮层（73.7％）中是区域7a（37.7％）的2倍。在所有测试的刺激运动中，在两个皮层区域中，对扩大的光流的响应最强。最后，我们将视觉刺激过程中运动皮层细胞的激活与在中心->向外任务中施加力时观察到的激活进行了比较。在针对运动和视觉任务进行分析的514个单元格中，有388个（75.5％）与一项或两项任务都具有显着关系，如下：284/388（73.2％）个单元格仅与运动任务有显着关系，27 / 388（7％）个单元格仅与视觉任务有显着关系，而其余77/388（19.8％）个单元格则与两个任务都具有显着关系。因此，共有361/514（70.2％）个单元格与运动任务有关，而104/514（20.2％）个单元格与视觉任务有关。最后，相对于感受野（RF），运动皮层神经元反应中没有清晰的视觉感受野结构，这与存在RF的区域7a相反，并且可以通过光流刺激的类型进行调节。

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