Signals driving the adaptation of saccades that require spatial updating
Signals driving the adaptation of saccades that require spatial updating
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驱动需要空间更新的眼跳适应的信号
DOI：
10.1152/jn.00075.2018
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发表时间：
2018
影响因子：
2.5
通讯作者：
Soetedjo, Robijanto
中科院分区：
文献类型：
--
作者：
Soetedjo, Robijanto
眼跳适应持续的自然或人为施加的不对称。利用视觉引导任务（VGT），揭示了目标步长矢量与预期的扫视指令矢量相同的扫视自适应特征和电路。然而，在现实生活中，在对目标的扫视发生之前，偶尔会有另一次扫视介入。这需要更新预期扫视，以解释其间的扫视位移，这将视觉目标信号和预期扫视命令分离开来。我们通过研究VGT和更新的跳叶之间的适应转移来确定它们的适应过程是否相似。通过双步扫视任务（DSTs）将最终的视觉目标与预期的扫视命令分离开来，在两步扫视任务中，两个目标在不同的位置连续闪现，而猴子保持注视。由此产生的朝第一个和第二个目标的扫视发生在黑暗中。视导扫视适应和视导扫视适应的转移取决于第二视觉目标的偏心率，而不取决于第二次扫视指令。如果与被适应的目标具有相同偏心率的目标在DST的跳间间隔内短暂出现，则更多的自适应转移。由于视觉目标在第一次扫视前或扫视间隔期间的短暂出现会影响第二次扫视表达的适应迁移量，因此适应和DST更新的处理可能重叠。新的和值得注意的是，眼跳的适应和空间更新被认为是独立的过程。当视觉目标与预期的扫视指令分离时，视觉引导的扫视适应与双步扫视任务（DST）的扫视适应的转移是由视觉误差而非运动误差驱动的。视觉目标的效果一直持续到DST的第二次扫视发生为止。因此，视跳的适应过程和空间更新过程可能是重叠的。
Saccades adapt to persistent natural or artificially imposed dysmetrias. The characteristics and circuitry of saccade adaptation have been revealed using a visually guided task (VGT) where the vectors of the target step and the intended saccade command are the same. However, in real life, another saccade occasionally intervenes before the saccade to the target occurs. This necessitates an updating of the intended saccade to account for the intervening saccadic displacement, which dissociates the visual target signal and the intended saccade command. We determined whether the adaptation process is similar for VGT and updated saccades by studying the transfer of adaptation between them. The ultimate visual target was dissociated from the intended saccade command with double-step saccade tasks (DSTs) in which two targets are flashed sequentially at different locations while the monkey maintains fixation. The resulting saccades toward the first and second targets occur in the dark. The transfer of visually guided saccade adaptation to the second saccades of a DST and vice versa depended on the eccentricity of the second visual target, and not the second saccade command. If a target with the same eccentricity as the adapted target appears briefly during the intersaccadic interval of a DST, more adaptation transfers. Because a brief appearance of the visual target either before the first saccade or during the intersaccadic interval influences how much adaptation transfer the second saccade will express, the processing of adaptation and DST updating may overlap.NEW & NOTEWORTHYAdaptation and the spatial updating of saccades are thought to be independent processes. When we dissociate the visual target and the intended saccade command, the transfer of visually guided saccade adaptation to the saccades of the double-step saccade tasks (DST) and vice versa is driven by a visual not motor error. The visual target has an effect until the second saccade of a DST occurs. Therefore, the processing of adaptation and the spatial updating of saccades may overlap.