Chen Zhe, Cave Kyle R
Department of Psychology, University of Canterbury, Christchurch, New Zealand.
Percept Psychophys. 2008 Nov;70(8):1435-43. doi: 10.3758/PP.70.8.1435.
Previous studies have concluded that object-based attention does not always arise if attention is cued endogenously (Macquistan, 1997) or if the target location is known with certainty (Shomstein & Yantis, 2002). In the Experiments reported here, we found object-based attention even when the locations of the two targets were known with certainty due to presentation of an endogenous cue. However, object-based attention can be prevented by limiting the exposure time of the object stimuli. These findings provide additional evidence against a search prioritization account of object-based attention. They lead to a fuller view of the role of object boundaries in directing attention. Object-based attention is frequently used spontaneously, even when the object boundaries are irrelevant to the task. However, object segmentation is not necessary for all tasks, because attention can be allocated before the stimulus has been segregated into objects.
先前的研究得出结论，如果注意力是通过内源性提示来引导的（Macquistan，1997），或者目标位置是确定已知的（Shomstein和Yantis，2002），基于对象的注意力并不总是会出现。在本文所报告的实验中，即使由于呈现了内源性提示而两个目标的位置是确定已知的，我们仍发现了基于对象的注意力。然而，通过限制对象刺激的呈现时间，可以阻止基于对象的注意力。这些发现提供了更多证据来反对基于搜索优先级的基于对象的注意力解释。它们使我们对对象边界在引导注意力方面的作用有了更全面的认识。基于对象的注意力经常会自发地被使用，即使对象边界与任务无关。然而，并非所有任务都需要对象分割，因为在刺激被分割成对象之前就可以分配注意力。
