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首页> 外文期刊>The European Journal of Neuroscience >Heading encoding in the macaque ventral intraparietal area (VIP).
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Heading encoding in the macaque ventral intraparietal area (VIP).

机译：猕猴腹顶壁内区域（VIP）中的标题编码。

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摘要

We recorded neuronal responses to optic flow stimuli in the ventral intraparietal area (VIP) of two awake macaque monkeys. According to previous studies on optic flow responses in monkey extrastriate cortex we used different stimulus classes: frontoparallel motion, radial stimuli (expansion and contraction) and rotational stimuli (clockwise and counter-clockwise). Seventy-five percent of the cells showed statistically significant responses to one or more of these optic flow stimuli. Shifting the location of the singularity of the optic flow stimuli within the visual field led to a response modulation in almost all cases. For the majority of neurons, this modulatory influence could be approximated in a statistically significant manner by a two-dimensional linear regression. Gradient directions, derived from the regression parameters and indicating the direction of the steepest increase in the responses, were uniformly distributed. At the population level, an unbiased average response for the stimuli with different focus locations was observed. By applying a population code, termed 'isofrequency encoding', we demonstrate the capability of the recorded neuronal ensemble to retrieve the focus location from its population discharge. Responses to expansion and contraction stimuli cannot be predicted based on quantitative data on a neuron's frontoparallel preferred stimulus direction and the location and size of its receptive field. These results, taken together with data on polymodal motion responses in this area, suggest an involvement of area VIP in the analysis and the encoding of heading.
机译：我们记录了两只清醒的猕猴腹顶壁内区域（VIP）中对视神经血流刺激的神经元反应。根据先前关于猴外泌皮层光流响应的研究，我们使用了不同的刺激类别：额平行运动，径向刺激（扩张和收缩）和旋转刺激（顺时针和逆时针）。百分之七十五的细胞显示出对一种或多种这些视觉流刺激的统计学显着反应。几乎在所有情况下，在视野内移动光流刺激的奇异性位置都会导致响应调制。对于大多数神经元，可通过二维线性回归以统计学上显着的方式近似此调节影响。从回归参数中得出的梯度方向是均匀分布的，它指示响应中最急剧增加的方向。在人群水平上，观察到具有不同焦点位置的刺激的无偏平均响应。通过应用称为“等频率编码”的人口代码，我们证明了记录的神经元集合从其人口放电中获取焦点位置的能力。无法根据神经元额叶平行首选刺激方向及其接受区域的位置和大小的定量数据来预测对扩张和收缩刺激的反应。这些结果与该区域中多峰运动响应的数据一起，表明区域VIP参与了航向的分析和编码。

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