Shared decision signal explains performance and timing of pursuit and saccadic eye movements.

Shared decision signal explains performance and timing of pursuit and saccadic eye movements.
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共享决策信号解释了追踪和扫视眼球运动的表现和时间安排。

DOI:
10.1167/5.9.3
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发表时间:
2005
期刊:
影响因子:
1.8
通讯作者:
Krauzlis,RichardJ
Krauzlis,RichardJ
中科院分区:
医学4区
文献类型:
--
作者:
Liston,Dorion;Krauzlis,RichardJ

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每一次随意的眼球运动都提供了视觉运动选择的物理证据,证明了在哪里和什么时候看。灵长类动物通过两种自愿的眼球运动——追逐和扫视来选择视觉目标,尽管它们之间协调的确切机制尚不清楚。追赶和扫视是由相同的决策信号引导的吗?本研究借用心理物理学和反应时间模型的技术,比较了追求和跳变选择。人类观察者执行一项辨别亮度的任务,并通过眼球运动表明他们的选择。由于刺激水平移动,垂直偏移,受试者的跟踪反应包括追逐和跳眼运动的组合。对于两种信号强度中的每一种,我们构建了追赶和扫视的速度-精度曲线。我们发现,追赶和扫视的速度-精度曲线具有相同的形状,但彼此之间存在时移。我们认为,这种模式的发生是因为追求和扫视共享一个决策信号,但利用不同的响应阈值,并受到不同的运动处理延迟。
Each voluntary eye movement provides physical evidence of a visuomotor choice about where and when to look. Primates choose visual targets with two types of voluntary eye movements, pursuit and saccades, although the exact mechanism underlying their coordination remains unknown. Are pursuit and saccades guided by the same decision signal? The present study compares pursuit and saccadic choices using techniques borrowed from psychophysics and models of response time. Human observers performed a luminance discrimination task and indicated their choices with eye movements. Because the stimuli moved horizontally and were offset vertically, subjects' tracking responses consisted of combinations of both pursuit and saccadic eye movements. For each of two signal strengths, we constructed speed–accuracy curves for pursuit and saccades. We found that speed–accuracy curves for pursuit and saccades have the same shape, but are time-shifted with respect to one another. We argue that this pattern occurs because pursuit and saccades share a decision signal, but utilize different response thresholds and are subject to different motor processing delays.
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