Visual responses on neck muscles reveal selective gating that prevents express Saccades
Visual responses on neck muscles reveal selective gating that prevents express Saccades
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DOI：
10.1016/s0896-6273(04)00267-3
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发表时间：
2004-06-10
期刊：
影响因子：
16.2
通讯作者：
Munoz, DP
中科院分区：
文献类型：
--
作者：
Corneil, BD;Olivier, E;Munoz, DP
快速眼跳能在极短的反应时间内促进视觉目标的获得。由于头部有相当大的惯性，还不清楚快速扫视是否伴随着对头部的平行指令。在这里，通过记录猴颈肌肉的肌电活动，我们证明了视觉目标呈现在极短的潜伏期(55-95ms)引起时间锁定的、偏侧的颈部肌肉招募。值得注意的是，这种招募不仅伴随着快速扫视，而且还先于非快速扫视，有时最高可达150毫秒。这些结果表明，选择性选通来自上丘的下行指令的组成部分，以防止快速眼跳，同时允许招募面向协同的头部。我们的结论是，这种选择性门控通过允许颈部肌肉的力量发展来帮助眼头协调，同时做出了致力于凝视转移的决定，优化了更具惯性的头部对随后的凝视转移的贡献。
Express saccades promote the acquisition of visual targets at extremely short reaction times. Because of the head's considerable inertia, it is unknown whether express saccades are accompanied by a parallel command to the head. Here, by recording electromyographic (EMG) activity from monkey neck muscles, we demonstrate that visual target presentation elicits time-locked, lateralized recruitment of neck muscles at extremely short latencies (55-95 ms). Remarkably, such recruitment not only accompanies express saccades, but also precedes nonexpress saccades, occasionally by up to 150 ms. These results demonstrate selective gating of components of descending commands from the superior colliculus to prevent express saccades yet permit recruitment of a head orienting synergy. We conclude that such selective gating aids eye-head coordination by permitting force development at neck muscles while a decision to commit to a gaze shift is being made, optimizing the contribution of the more inertial head to the ensuing gaze shift.