Contributed Session II: The relationship between temporal summation at detection threshold and fixational eye movements.
Contributed Session II: The relationship between temporal summation at detection threshold and fixational eye movements.
复制标题
贡献会议 II：检测阈值的时间总和与注视眼球运动之间的关系。
DOI：
10.1167/jov.23.15.75
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发表时间：
2023
影响因子：
1.8
通讯作者：
Hexley AC
中科院分区：
文献类型：
--
作者：
Hexley AC
本文研究了增量脉冲的阈时和与注视眼动的关系。6名受试者完成了2AFC增量检测任务。刺激是通过具有60 Hz帧速率的AOSLO呈现的543 nm光的0.16 x 2.2弧分增量。用于时间整合的刺激是具有16 ms（连续帧）、33 ms、100 ms或300 ms刺激间间隔（ISI）的两个单帧呈现。还收集了单个帧上显示的增量数据。刺激以世界固定坐标（自然视网膜图像运动）呈现或稳定在视网膜上。个体之间的整体敏感性存在很大差异，但ISI的表现变化的时间过程在参与者之间是相似的。ISI= 33 ms的阈值接近两个连续帧的性能，表明光能的完全求和;而ISI= 300 ms的阈值更接近单帧情况，表明有限求和; ISI= 100 ms的阈值居中，表明剩余求和。ISI对阈值的影响是类似的稳定刺激和自然观看，但有一个小的趋势，在短ISI和长ISI的稳定刺激的阈值较低，反之亦然。我们计划在一个理想的观察者计算的背景下提出我们的结果，这可能会澄清初始视觉编码，包括锥内的时间求和，形状性能。
We studied the relationship between the threshold temporal summation of increment pulses and fixational eye-movements. Six participants completed a 2AFC increment detection task. Stimuli were 0.16 x 2.2 arcmin increments of 543 nm light presented via an AOSLO with a 60 Hz frame rate. Stimuli for temporal integration were two single frame presentations with a 16 ms (consecutive frames), 33 ms, 100 ms, or 300 ms inter-stimulus interval (ISI). Data were also collected for increments presented on a single frame. Stimuli were presented in either world-fixed coordinates (natural retinal image motion) or were stabilised on the retina. There were large differences in overall sensitivity across individuals, but the time-course of performance change with ISI was similar across participants. Thresholds for ISI= 33 ms were close to performance with two consecutive frames, suggesting complete summation of light energy; whereas thresholds for ISI= 300 ms were closer to the single-frame case, suggesting limited summation; and thresholds for ISI= 100 ms were intermediate, suggesting residual summation. The effect of ISI on threshold was similar for stabilised stimuli and natural viewing, but there was a small trend towards lower thresholds for stabilised stimuli at short ISI and vice-versa at long ISI. We plan to present our results in the context of an ideal observer calculation that may clarify how the initial visual encoding, including temporal summation within cones, shapes performance.