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首页> 外文期刊>Progress in brain research >Neural activity in the primate superior colliculus and saccadic reaction times in double-step experiments.
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Neural activity in the primate superior colliculus and saccadic reaction times in double-step experiments.

机译：在双步实验中，灵长类上丘神经的神经活动和眼跳反应时间。

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Although primates including humans can do 2-3 saccades per second while observing their environment, this seems to be more complicated when the same visual target is displaced twice in brief succession. When the subject has to follow this target with its gaze, the reaction time of the second saccade is longer than that of the first. We present data from electrophysiological recordings in the superior colliculus of a monkey that is performing a double-step saccade task. Analysis of the neuronal activity shows that the fixation neurons and the saccadic neurons respond differently in single- and double-step tasks. Fixation neurons are not as active between the two saccades as could be expected from single-step trials. Therefore, the fixation neurons are not likely to cause the increase in reaction time. The recorded saccadic neurons usually showed a presumably visual activation about 70 ms after target appearance and a motor burst starting briefly before the saccade. A target-aligned response was encountered in half of the neurons about 150 ms after the second target appearance. The early visual target-aligned response is often lost before the second saccade in a double-step task with short stimulus delay. The rise of activity was slower before the second than before the first saccade. The neural latency was therefore longer before the second saccade. The motor burst coincides with the second saccade although it is delayed. Thus, the motor burst was always predictive of the occurrence of the saccade. We conclude that the fixation neurons in the superior colliculus are not likely to cause the delay of the second saccade, and that the activity in the saccadic neurons in the superior colliculus encodes the timing of the second saccade even if it is delayed.
机译：尽管包括人类在内的灵长类动物每秒可以观察2-3个扫视，但是当同一视觉目标短暂连续两次移位时，这似乎更加复杂。当受试者必须凝视跟随该目标时，第二次扫视的反应时间比第一次扫视的反应时间长。我们目前正在执行双步扫视任务的猴子的上丘中来自电生理记录的数据。对神经元活动的分析表明，固定神经元和神经元在单步和双步任务中的反应不同。固定在两个扫视之间的神经元不如单步试验所期望的那样活跃。因此，固定神经元不太可能引起反应时间的增加。记录的神经元通常在目标出现后约70毫秒显示出视觉激活，并且在扫视之前短暂开始运动爆发。第二次出现靶标后约150毫秒，在一半的神经元中遇到了靶标定向反应。早期视觉目标对准反应通常在第二步扫视之前失去，并且刺激延迟很短。在第二次之前，活动的增加比第一次扫视之前的活动慢。因此，神经潜伏期要长于第二次扫视。电机脉冲虽然与第二扫视重合，但仍被延迟。因此，运动爆发总是预示着扫视的发生。我们得出的结论是，上丘的固定神经元不太可能引起第二扫视的延迟，并且即使上延迟，上丘的扫视神经元的活动也会编码第二扫视的时间。

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