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首页> 外文期刊>Vision Research: An International Journal in Visual Science >Are the visual transients from microsaccades helpful? Measuring the influences of small saccades on contrast sensitivity
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Are the visual transients from microsaccades helpful? Measuring the influences of small saccades on contrast sensitivity

机译：微扫视的视觉瞬变对您有帮助吗？测量小扫视对对比度灵敏度的影响

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Like all saccades, microsaccades cause both spatial and temporal changes in the input to the retina. In space, recent studies have shown that these small shifts precisely relocate a narrow (smaller than the foveola) high-acuity retinal locus on the stimulus. However, it has long been questioned whether the temporal modulations resulting from microsaccades are also beneficial for vision. To address this question, we combined spectral analysis of the visual input to the retina with measurements of contrast sensitivity in humans. Estimation of how different types of eye movements redistribute the power of an otherwise stationary stimulus shows that small saccades contribute more temporal power than ocular drift in the low-frequency range, suggesting a specific role for these movements in the encoding of low spatial frequencies. However, an influence on contrast sensitivity was only found for saccades with amplitudes larger than 30'. Contrast thresholds remained highly similar in the presence and absence of smaller saccades. Furthermore, saccades of all amplitudes, including microsaccades, were strongly suppressed during exposure to the stimulus. These findings do not support an important function of the visual transients caused by microsaccades. (C) 2015 Elsevier Ltd. All rights reserved.
机译：像所有扫视一样，微扫视会导致视网膜输入的时空变化。在太空中，最近的研究表明，这些微小的变化会在刺激上精确地将狭窄的（比黄凹中心小）高敏度视网膜轨迹重新定位。然而，长期以来人们一直怀疑，由微扫视产生的时间调制是否也对视力有益。为了解决这个问题，我们结合了对视网膜视觉输入的频谱分析和对人类对比敏感度的测量。对不同类型的眼睛运动如何重新分配原本静止的刺激力的估计表明，在低频范围内，小扫视比眼动漂移贡献更多的时间能量，这暗示了这些运动在低频空间编码中的特定作用。但是，仅对振幅大于30'的扫视镜才发现对对比度灵敏度的影响。在存在和不存在较小扫视的情况下，对比度阈值仍然非常相似。此外，在暴露于刺激过程中，包括微扫视在内的所有振幅的扫视都被强烈抑制。这些发现不支持由微扫视引起的视觉瞬变的重要功能。 （C）2015 Elsevier Ltd.保留所有权利。

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