Improved visual sensitivity during smooth pursuit eye movements: Temporal and spatial characteristics
Improved visual sensitivity during smooth pursuit eye movements: Temporal and spatial characteristics
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DOI：
10.1017/s0952523809990083
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发表时间：
2009-05-01
影响因子：
1.9
通讯作者：
Gegenfurtner, Karl R.
中科院分区：
文献类型：
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作者：
Schuetz, Alexander C.;Braun, Doris I.;Gegenfurtner, Karl R.
最近，我们表明，在平滑追踪眼球运动期间，对颜色和高空间频率亮度刺激的对比敏感度增强（Schutz等人，2008年）。在这项研究中，我们研究了在很宽的时间和空间频率范围内的增强。在实验1中，我们测量了彩色刺激的时间脉冲响应函数（TIRF）。追踪和注视的TIRF主要在增益方面不同，但在自然时间频率方面没有差异。因此，敏感性增强似乎是相当独立的时间频率的刺激。在实验2中，我们测量了亮度定义的Gabor贴片的空间对比敏感度函数，空间频率范围在0.2到7 cpd之间。我们发现，在2-3 cpd以上的空间频率追踪期间，敏感度有所改善。在0.5到3 cpd之间，平滑追踪眼球运动会损害敏感度，但在低于0.5cpd.2实验的结果是一致的，与小细胞retinogeniculate途径的对比度增益增加。
Recently, we showed that contrast sensitivity for color and high-spatial frequency luminance stimuli is enhanced during smooth pursuit eye movements (Schutz et al., 2008). In this Study, we investigated the enhancement over a wide range of temporal and spatial frequencies. In Experiment 1, we measured the temporal impulse response function (TIRF) for colored stimuli. The TIRF for Pursuit and fixation differed mostly with respect to the gain but not with respect to the natural temporal frequency. Hence, the sensitivity enhancement seems to be rather independent of the temporal frequency of the stimuli. In Experiment 2, we measured the spatial contrast sensitivity function for luminance-defined Gabor patches with spatial frequencies ranging front 0.2 to 7 cpd. We found a sensitivity improvement during pursuit for spatial frequencies above 2-3 cpd. Between 0.5 and 3 cpd, sensitivity was impaired by smooth pursuit eye movements, but no consistent difference was observed below 0.5 cpd. The results of both experiments are consistent with an increased contrast gain of the parvocellular retinogeniculate pathway.