Otten Mara, Schreij Daniel, Los Sander A
Universiteit Utrecht, Utrecht, The Netherlands.
Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
Atten Percept Psychophys. 2016 Aug;78(6):1642-54. doi: 10.3758/s13414-016-1121-8.
Search for a target stimulus among distractors is subject to both goal-driven and stimulus-driven influences. Variables that selectively modify these influences have shown strong interaction effects on saccade trajectories toward the target, suggesting the involvement of a shared spatial orienting mechanism. However, subsequent manual response times (RTs) have revealed additive effects, suggesting that different mechanisms are involved. In the present study, we tested the hypothesis that an interaction for RTs is obscured by preceding multisaccade trajectories, promoted by the continuous presence of distractors in the display. In two experiments, we compared a condition in which distractors were removed soon after the presentation of the search display to a standard condition in which distractors were not removed. The results showed additive goal-driven and stimulus-driven effects on RTs in the standard condition, but an interaction when distractors were removed. These findings support the view that both variables influence a shared spatial orienting mechanism.
在干扰物中搜索目标刺激会受到目标驱动和刺激驱动的双重影响。选择性改变这些影响的变量已显示出对朝向目标的扫视轨迹有强烈的交互作用，这表明存在一个共享的空间定向机制。然而，随后的手动反应时间（RTs）显示出相加效应，这表明涉及不同的机制。在本研究中，我们检验了这样一个假设：RTs的交互作用被之前的多扫视轨迹所掩盖，而这种掩盖是由显示中干扰物的持续存在所促成的。在两个实验中，我们将搜索显示呈现后不久就移除干扰物的条件与不移除干扰物的标准条件进行了比较。结果显示，在标准条件下，RTs存在目标驱动和刺激驱动的相加效应，但在移除干扰物时则存在交互作用。这些发现支持了这一观点，即这两个变量都会影响一个共享的空间定向机制。
