Department of Experimental Psychology, University of Cambridge, Cambridge, United Kingdom.
PLoS One. 2012;7(5):e37596. doi: 10.1371/journal.pone.0037596. Epub 2012 May 22.
The attentional blink (AB) describes a time-based deficit in processing the second of two masked targets. The AB is attenuated if successive targets appear between the first and final target, or if a cueing target is positioned before the final target. Using various speeds of stimulus presentation, the current study employed successive targets and cueing targets to confirm and extend an understanding of target-target cueing in the AB. In Experiment 1, three targets were presented sequentially at rates of 30 msec/item or 90 msec/item. Successive targets presented at 90 msec improved performance compared with non-successive targets. However, accuracy was equivalently high for successive and non-successive targets presented at 30 msec/item, suggesting that--regardless of whether they occurred consecutively--those items fell within the temporally defined attentional window initiated by the first target. Using four different presentation speeds, Experiment 2 confirmed the time-based definition of the AB and the success of target-cueing at 30 msec/item. This experiment additionally revealed that cueing was most effective when resources were not devoted to the cue, thereby implicating capacity limitations in the AB. Across both experiments, a novel order-error measure suggested that errors tend to decrease with an increasing duration between the targets, but also revealed that certain stimulus conditions result in stable order accuracy. Overall, the results are best encapsulated by target-based and resource-sharing theories of the AB, which collectively value the contributions of capacity limitations and optimizing transient attention in time.
注意瞬脱(AB)描述了在两个掩蔽目标中处理第二个目标时出现的基于时间的缺陷。如果连续的目标出现在第一个和最后一个目标之间,或者如果一个提示目标被放置在最后一个目标之前,那么 AB 就会减弱。本研究使用各种刺激呈现速度,通过连续目标和提示目标来确认和扩展对 AB 中目标-目标提示的理解。在实验 1 中,三个目标以 30 毫秒/项目或 90 毫秒/项目的速度顺序呈现。与非连续目标相比,90 毫秒的连续目标提高了性能。然而,以 30 毫秒/项目的速度呈现连续和非连续目标的准确性同样高,这表明——无论它们是否连续出现——这些项目都落在由第一个目标启动的时间定义的注意窗口内。在实验 2 中,使用四个不同的呈现速度,确认了 AB 的基于时间的定义和 30 毫秒/项目的目标提示的成功。该实验还表明,当资源不用于提示时,提示最为有效,这暗示了 AB 中的容量限制。在这两个实验中,一个新的顺序错误测量表明,随着目标之间的持续时间增加,错误往往会减少,但也揭示了某些刺激条件会导致稳定的顺序准确性。总的来说,AB 的基于目标和资源共享理论可以最好地解释这些结果,这些理论共同重视容量限制和优化瞬态注意力在时间上的贡献。