Neuronal Population Codes and the Perception of Object Distance in Weakly Electric Fish
Neuronal Population Codes and the Perception of Object Distance in Weakly Electric Fish
复制标题
弱电鱼的神经元群体编码和物体距离感知
DOI：
10.1523/jneurosci.21-08-02842.2001
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
L. Maler
中科院分区：
文献类型：
--
作者：
J. E. Lewis;L. Maler
弱电鱼类使用电感在黑暗中导航和捕捉猎物。鱼周围的物体在其自身产生的电场中会产生扭曲；这些扭曲在皮肤表面形成一个类似高斯的二维电子图像。为了确定物体的距离，必须估计其电子图像的峰值幅度和宽度。这些感觉特征是由电感觉通路早期阶段的神经元群体编码的，但不是用经典的钟形神经元调谐曲线来表示的。相反，钟形调谐曲线确实表征了神经元对身体表面电子图像位置的反应，从而形成了这一特征的平行二维地图。在这种二维映射的情况下，理论结果表明，神经调谐的宽度应该不会对种群代码的准确性产生影响。这里我们表明，尽管电感觉图的空间尺度不影响编码电子图像的体表位置的精度，但调谐较窄的图更适合于估计图像宽度，而调谐较宽的图更适合于估计图像幅度。我们定量地评估了一种两步距离感知算法，该算法包括对电子图像的峰值幅度和宽度的顺序估计。该算法最好由两个不同调谐宽度的神经映射来实现。这些结果表明，多个感觉特征图可能具有不同的调谐宽度，用于编码没有明确映射的额外感觉特征。
Weakly electric fish use an electric sense to navigate and capture prey in the dark. Objects in the surroundings of the fish produce distortions in their self-generated electric field; these distortions form a two-dimensional Gaussian-like electric image on the skin surface. To determine the distance of an object, the peak amplitude and width of its electric image must be estimated. These sensory features are encoded by a neuronal population in the early stages of the electrosensory pathway, but are not represented with classic bell-shaped neuronal tuning curves. In contrast, bell-shaped tuning curves do characterize the neuronal responses to the location of the electric image on the body surface, such that parallel two-dimensional maps of this feature are formed. In the case of such two-dimensional maps, theoretical results suggest that the width of neural tuning should have no effect on the accuracy of a population code. Here we show that although the spatial scale of the electrosensory maps does not affect the accuracy of encoding the body surface location of the electric image, maps with narrower tuning are better for estimating image width and those with wider tuning are better for estimating image amplitude. We quantitatively evaluate a two-step algorithm for distance perception involving the sequential estimation of peak amplitude and width of the electric image. This algorithm is best implemented by two neural maps with different tuning widths. These results suggest that multiple maps of sensory features may be specialized with different tuning widths, for encoding additional sensory features that are not explicitly mapped.
DOI：
10.1162/089976698300017818
发表时间：
1998
期刊：
Neural computation.
影响因子：
--
作者：
Zemel,RS;Dayan,P;Pouget,A
通讯作者：
Pouget,A
DOI：
10.1242/jeb.202.10.1185
发表时间：
1999
期刊：
The Journal of experimental biology
影响因子：
--
作者：
Assad,C;Rasnow,B;Stoddard,PK
通讯作者：
Stoddard,PK
弱电鱼 Apteronotus albifrons 的猎物捕获：感觉获取策略和电感觉后果。
DOI：
10.1242/jeb.202.10.1195
发表时间：
1999
期刊：
The Journal of experimental biology
影响因子：
--
作者：
Nelson,ME;Maciver,MA
通讯作者：
Maciver,MA