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首页> 外文期刊>Journal of Neurophysiology >Adaptation and information transmission in fly motion detection.
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Adaptation and information transmission in fly motion detection.

机译：飞行运动检测中的适应和信息传输。

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In this work, we studied the adaptation of H1, a motion-sensitive neuron in the fly visual system, to the variance of randomly fluctuating velocity stimuli. We ask two questions. 1) Which components of the motion detection system undergo genuine adaptational changes in response to the variance of the fluctuating velocity signal? 2) What are the consequences of this adaptation for the information processing capabilities of the neuron? To address these questions, we characterized the adaptation of H1 by estimating the changes in the parameters of an associated Reichardt motion detection model under various stimulus conditions. The strongest stimulus dependence was exhibited by the temporal kernel of the motion detector and was parametrized by changes in the model's high-pass time constant (tau(H)). This time constant shortened considerably with increasing velocity fluctuations. We showed that this adaptive process contributes significantly to the shortening of the velocity response time-course but not tovelocity gain control. To assess the contribution of time-constant adaptation to information transmission, we compared the information rates generated by our adaptive model motion detector with model simulations in which tau(H) was held fixed at its unadapted value for all stimulus conditions. We found that for intermediate stimulus conditions, fixing tau(H) at its unadapted value led to higher information rates, suggesting that time-constant adaptation does not optimize total information rates about velocity trajectories. We also found that, over the wide range of stimulus conditions tested here, H1 information rates are dependent on the amplitude of velocity fluctuations.
机译：在这项工作中，我们研究了飞行视觉系统中运动敏感神经元H1对随机波动速度刺激方差的适应性。我们问两个问题。 1）运动检测系统的哪些组件响应于速度信号波动而发生真正的适应性变化？ 2）这种适应对神经元的信息处理能力有什么后果？为了解决这些问题，我们通过估计各种刺激条件下相关的Reichardt运动检测模型的参数变化来表征H1的适应性。运动检测器的时间内核表现出最强的刺激依赖性，并且通过模型的高通时间常数（tau（H））的变化进行参数化。随着速度波动的增加，该时间常数大大缩短。我们表明，这种自适应过程极大地有助于缩短速度响应时间过程，但对速度增益控制没有帮助。为了评估时间常数适应对信息传输的贡献，我们将自适应模型运动检测器产生的信息速率与模型仿真进行了比较，在模型仿真中，在所有刺激条件下，tau（H）均保持固定在其不适应值。我们发现，对于中间刺激条件，将tau（H）固定在其不适应的值会导致较高的信息速率，这表明时间常数的适应不能优化关于速度轨迹的总信息速率。我们还发现，在此处测试的各种刺激条件下，H1信息速率取决于速度波动的幅度。

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