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首页> 外文期刊>The European Journal of Neuroscience >Direction tuning of human motion detection determined from a population model.
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Direction tuning of human motion detection determined from a population model.

机译：根据人口模型确定的人体运动检测的方向调整。

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Mass responses that are obtained using electrophysiological or psychophysical techniques are inadequate to characterize motion detectors at the single-unit level. Therefore, we have modelled a population of motion detectors and fitted their mass response to motion-onset EEG data. By examining a single unit of the modelled population we could assess the range of directions and the level of adaptation an individual motion detector responded to. Stimuli were patterns of randomly distributed dots. After subjects had adapted to either a non-moving pattern or to motion in one fixed direction, the pattern moved in one of seven possible test directions. The population model assumed elementary motion detectors with a Gaussian angle-selectivity profile. The population response was calculated as the sum of all adaptation-weighted individual responses to the test direction. In all subjects, we observed sizeable effects of adaptation on test directions close to the adapted direction and small amounts of direction-independent adaptation for all test directions. The model fit explained 75% (Oz) and 94% (lateral derivation) of the total variance and revealed a motion detector bandwidth (full width at half maximum) of 72 degrees (Oz) and 62 degrees (lateral derivation). The maximal adaptation depth was estimated as 72% (Oz) and 66% (lateral derivation). Estimates inferred from the population model representing human motion detectors were found to be close to those obtained by single-cell data from non-human primates.
机译：使用电生理或心理物理技术获得的质量响应不足以表征单个单元级别的运动检测器。因此，我们对运动检测器进行了建模，并将其质量响应拟合为运动开始的脑电数据。通过检查建模人口的单个单位，我们可以评估方向范围和单个运动检测器响应的适应水平。刺激是随机分布的点的图案。在受试者适应一种非运动模式或沿一个固定方向运动之后，该模式沿七个可能的测试方向之一运动。总体模型假定基本运动检测器具有高斯角度选择性分布。总体响应计算为对测试方向的所有适应加权个体响应的总和。在所有受试者中，我们观察到适应对接近适应方向的测试方向的巨大影响，以及针对所有测试方向的少量与方向无关的适应。模型拟合解释了总方差的75％（Oz）和94％（横向导数），并显示了72度（Oz）和62度（横向导数）的运动检测器带宽（半峰全宽）。最大适应深度估计为72％（Oz）和66％（侧向导数）。发现从代表人类运动检测器的种群模型推断出的估计值与通过非人灵长类动物的单细胞数据获得的估计值接近。

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