Horowitz Todd S, Fine Elisabeth M, Fencsik David E, Yurgenson Sergey, Wolfe Jeremy M
Visual Attention Laboratory, Brigham and Women's Hospital, 64 Sidney Street, Cambridge, MA 02139, USA.
Psychol Sci. 2007 Apr;18(4):356-63. doi: 10.1111/j.1467-9280.2007.01903.x.
The debate about the nature of fixational eye movements has revived recently with the claim that microsaccades reflect the direction of attentional shifts. A number of studies have shown an association between the direction of attentional cues and the direction of microsaccades. We sought to determine whether microsaccades in attentional tasks are causally related to behavior. Is reaction time (RT) faster when microsaccades point toward the target than when they point in the opposite direction? We used a dual-Purkinje-image eyetracker to measure gaze position while 3 observers (2 of the authors, 1 naive observer) performed an attentional cuing task under three different response conditions: saccadic localization, manual localization, and manual detection. Critical trials were those on which microsaccades moved away from the cue. On these trials, RTs were slower when microsaccades were oriented toward the target than when they were oriented away from the target. We obtained similar results for direction of drift. Cues, not fixational eye movements, predicted behavior.
关于注视性眼动本质的争论最近再度兴起，有人声称微扫视反映了注意力转移的方向。多项研究表明注意力线索的方向与微扫视的方向之间存在关联。我们试图确定在注意力任务中的微扫视是否与行为存在因果关系。当微扫视指向目标时的反应时间（RT）是否比其指向相反方向时更快？我们使用双浦肯野图像眼动仪来测量注视位置，同时3名观察者（作者中的2名，1名未接触过该研究的观察者）在三种不同的反应条件下执行注意力提示任务：眼跳定位、手动定位和手动检测。关键试验是那些微扫视远离线索的试验。在这些试验中，当微扫视朝向目标时的反应时间比其远离目标时更慢。我们在漂移方向上也得到了类似的结果。是线索，而非注视性眼动，预测了行为。
