Modulation of saccadic intrusions by exogenous and endogenous attention.
Modulation of saccadic intrusions by exogenous and endogenous attention.
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DOI：
10.1016/j.brainres.2007.01.047
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发表时间：
2007-04-13
期刊：
影响因子：
2.9
通讯作者：
Miall RC
中科院分区：
文献类型：
--
作者：
Gowen E;Abadi RV;Poliakoff E;Hansen PC;Miall RC
在健康个体中，主注视固定经常被微扫视和扫视侵入（SI）中断。负责控制注意力和眼球运动的神经系统被认为是重叠的，并且与此一致，微扫视的行为似乎受到外源性和内源性注意力转移的影响。在目前的工作中，我们希望确定SI是否也会受到注意力的影响。12名参与者进行了一项线索目标任务，他们被暗示外源性或内源性，并作出反应，无论是按下按钮或眼跳的外围目标的外观。我们的研究结果表明，SI的影响，外源性和内源性的注意，并在一个非常相似的方式，以微扫视。在所有条件下，SI频率最初下降后的线索，然后上升到最大值，然后下降到低于基线水平。随着外源性线索的出现，SI更频繁地被引导远离线索，正如返回抑制所预测的那样。此外，SI方向的内源性线索后，偏向于线索的扫视反应模式，这表明眼球运动和注意系统重叠的程度取决于是否需要眼球运动。综上所述，我们的研究结果表明，SI的特点是由外源性和内源性的注意调制，并建议SI和微眼跳可能在于一个连续的固定不稳定性，此外，SI可能会提供更多的见解注意和眼动系统之间的关系。
Primary gaze fixation in healthy individuals is frequently interrupted by microsaccades and saccadic intrusions (SI). The neural systems responsible for the control of attention and eye movements are believed to overlap and in line with this, the behaviour of microsaccades appears to be affected by exogenous and endogenous attention shifts. In the current work we wished to establish whether SI would also be influenced by attention. Twelve participants performed a cue-target task where they were cued exogenously or endogenously and had to respond to the appearance of a peripheral target with either a button press or saccade. Our results indicate that SI are influenced by exogenous and endogenous attention and in a very similar manner to microsaccades. In all conditions, SI frequency initially decreased following the cue, then rose to a maximum before falling to below baseline levels. Following the exogenous cue, SI were more frequently directed away from the cue as predicted by inhibition of return. Additionally, SI direction following the endogenous cue was biased towards the cue for the saccadic response mode only, suggesting that the degree to which the eye movement and attention systems overlap depends on whether an eye movement is required. In summary, our findings indicate that SI characteristics are modulated by exogenous and endogenous attention and suggest that SI and microsaccades may lie on a continuum of fixational instabilities and furthermore, SI are likely to provide greater insights into the relationship between attention and the oculomotor systems.
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