Object recognition during foveating eye movements
Object recognition during foveating eye movements
复制标题
眼球运动时的物体识别
DOI：
10.1016/j.visres.2009.05.022
复制
发表时间：
2009
期刊：
影响因子：
1.8
通讯作者：
Gegenfurtner
中科院分区：
文献类型：
--
作者：
Schütz;Gegenfurtner
我们研究了眼跳和平稳追逐眼动对眼动目标内出现的短暂呈现字母的识别有何影响。首先，我们比较了稳态追踪和注视时的识别性能。单个字母被呈现了7个不同的持续时间，范围从10到400毫秒，以及4个对比度水平，从5%到40%。对于这两种眼动，识别率随着持续时间和对比度的增加而增加，但在追踪过程中，识别率平均降低了11%。在日常生活中，人类使用扫视和平滑追逐眼球运动相结合的方式来凹陷外围移动的物体。为了研究这种更自然的情况，我们提出了一个外围靶点，它要么是静止的，要么是水平移动的，在凝视点的上方或下方。参与者被要求跳向目标，并保持凹陷。这些字母是在与第一个目标定向扫视不同的时间呈现的。正如眼跳时视网膜掩蔽和运动模糊所预期的那样，辨别性能随着眼跳后延迟的增加而增加。如果目标移动，扫视后追逐，字母识别性能平均比目标静止而扫视后注视时低16%。
We studied how saccadic and smooth pursuit eye movements affect the recognition of briefly presented letters appearing within the eye movement target. First we compared the recognition performance during steady-state pursuit and during fixation. Single letters were presented for seven different durations ranging from 10 to 400ms and four contrast levels ranging from 5% to 40%. For both types of eye movements the recognition rates increased with duration and contrast, but they were on average 11% lower during pursuit. In daily life humans use a combination of saccadic and smooth pursuit eye movements to foveate a peripheral moving object. To investigate this more natural situation, we presented a peripheral target that was either stationary or moving horizontally, above or below the fixation spot. Participants were asked to saccade to the target and to keep it foveated. The letters were presented at different times relative to the first target directed saccade. As would be expected from retinal masking and motion blur during saccades, the discrimination performance increased with increasing post-saccadic delay. If the target moved and the saccade was followed by pursuit, letter recognition performance was on average 16% lower than if the target was stationary and the saccade was followed by fixation.
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