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首页> 外文期刊>The European Journal of Neuroscience >Fixational saccades alter the gap effect
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Fixational saccades alter the gap effect

机译：固定扫视改变间隙效应

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摘要

The reaction times of saccadic eye movements have been studied extensively as a probe for cognitive behavior controlled by large-scale cortical and subcortical neural networks. Recent studies have shown that the reaction times of targeting saccades toward peripheral visual stimuli are prolonged by fixational saccades, the largest miniature eye movements including microsaccades. We have shown previously that the frequency of fixational saccades is decreased by volitional action preparation controlled internally during the antisaccade paradigm (look away from a stimulus). Instead, here we examined whether fixational saccade modulation induced externally by sensory events could also account for targeting saccade facilitation by the same sensory events. When targeting saccades were facilitated by prior fixation stimulus disappearance (gap effect), fixational saccade occurrence was reduced, which could theoretically facilitate targeting saccades. However, such reduction was followed immediately by the rebound of fixational saccade occurrence in some subjects, which could eliminate potential benefits from the previous fixational saccade reduction. These results do not mean that fixational saccades were unrelated to the gap effect because they indeed altered that effect by delaying targeting saccade initiation on trials without the fixation gap more strongly than trials with it. Such changes might be attributed to the disruption of volitional saccade preparation because the frequency of fixational saccades observed in this study was associated with the ability of volitional control over antisaccade behavior. These results suggest that fixational saccades alter the gap effect on targeting saccade reaction times, presumably by disrupting volitional saccade commands.
机译：眼跳运动的反应时间已被广泛研究，作为探究大规模皮层和皮层下神经网络控制认知行为的方法。最近的研究表明，固定眼扫视可将瞄准扫视镜向周围视觉刺激的反应时间延长，而固定眼视镜是包括微扫视镜在内最大的微型眼动运动。先前我们已经表明，通过在反扫视范式（内部远离刺激）中进行内部控制的自愿行动准备，可以减少注视扫视的频率。取而代之的是，在这里我们检查了由感官事件在外部引起的注视扫视调制是否也可以解释由相同的感官事件引起的针对扫视的促进作用。当先前的固定刺激消失（间隙效应）促进靶向扫视时，固定扫视的发生减少，这在理论上可以促进靶向扫视。但是，在这种减少之后，某些受试者的固定扫视发生后会立即反弹，这可能会消除先前的固定扫视减少带来的潜在好处。这些结果并不意味着固定扫视与间隙效应无关，因为它们确实通过延迟目标扫视的启动而改变了该效应，而没有固定间隙的试验比没有固定间隙的试验更强烈。此类变化可能归因于自愿性扫视准备的中断，因为在本研究中观察到的固定性扫视的频率与自愿控制反扫视行为的能力有关。这些结果表明，固定扫视可能通过破坏自愿扫视命令而改变了针对瞄准扫视反应时间的间隙效应。

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