Kinesthetic information facilitates saccades towards proprioceptive-tactile targets
Kinesthetic information facilitates saccades towards proprioceptive-tactile targets
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动觉信息促进扫视本体感觉触觉目标
DOI：
10.1016/j.visres.2016.03.008
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发表时间：
2016
期刊：
影响因子：
1.8
通讯作者：
Fiehler
中科院分区：
文献类型：
--
作者：
Voudouris;Goettker;Mueller;Fiehler
对体感目标的扫视具有更长的潜伏期，并且比对视觉目标的扫视更不准确和精确。在这里，我们研究了不同的体感信息如何影响眼跳运动的计划和控制。参与者注视着一个中心十字架，并以尽可能快的速度启动扫视，以回应呈现在他们看不见的左手的食指或中指尖端的触觉刺激。在静态条件下，在整个试验过程中，手保持在目标位置，刺激在听觉音调后的固定时间呈现。因此，仅从本体感觉和触觉信息得出目标位置。在移动条件下，首先将手主动移动到相同的目标位置，然后立即给出刺激。因此，在移动条件下，关于目标位置的额外运动信息是可用的。我们发现，与静止状态相比，运动状态下的眼跳潜伏期更短，但在精确度或眼跳终点的精确度方面没有差异。在第二个实验中，我们在听觉音调(静态条件)或手部运动结束(移动条件)之后引入了可变延迟，以降低刺激时刻的可预测性，并允许更多的时间来处理运动感觉信息。我们再次发现，与静态条件相比，移动的潜伏期更短，但在扫视准确性或精确度方面没有改善。在第三个实验中，我们证明了移动条件下较短的眼跳潜伏期不能用相关事件(听觉音调或手端运动)和刺激时刻之间的时间接近来解释。我们的发现表明，动觉信息促进了对本体感觉-触觉靶点的眼跳运动的计划，而不是控制。
Saccades to somatosensory targets have longer latencies and are less accurate and precise than saccades to visual targets. Here we examined how different somatosensory information influences the planning and control of saccadic eye movements. Participants fixated a central cross and initiated a saccade as fast as possible in response to a tactile stimulus that was presented to either the index or the middle fingertip of their unseen left hand. Ina static condition, the hand remained at a target location for the entire block of trials and the stimulus was presented at a fixed time after an auditory tone. Therefore, the target location was derived only from proprioceptive and tactile information. In amoving condition, the hand was first actively moved to the same target location and the stimulus was then presented immediately. Thus, in themoving conditionadditional kinesthetic information about the target location was available. We found shorter saccade latencies in the moving compared to thestatic condition, but no differences in accuracy or precision of saccadic endpoints. In a second experiment, we introduced variable delays after the auditory tone (static condition) or after the end of the hand movement (moving condition) in order to reduce the predictability of the moment of the stimulation and to allow more time to process the kinesthetic information. Again, we found shorter latencies in themovingcompared to thestatic conditionbut no improvement in saccade accuracy or precision. In a third experiment, we showed that the shorter saccade latencies in themoving conditioncannot be explained by the temporal proximity between the relevant event (auditory tone or end of hand movement) and the moment of the stimulation. Our findings suggest that kinesthetic information facilitates planning, but not control, of saccadic eye movements to proprioceptive-tactile targets.
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