基于物体的注意对Simon效应的调节

The Modulation of Object-based Attention on Simon Effect

本研究采用双长方形框范式的变式将注意分离为基于空间和基于物体的注意,在此基础上探讨了注意对Simon效应的调节是否由基于物体的注意引起。结果发现,当长方形框水平排列时在基于物体的注意条件下Simon效应增大,而当长方形框垂直排列时在基于物体的注意条件下Simon效应没有显著变化。这表明,在长方形框水平排列时基于物体的注意可以调节Simon效应。实验结果部分支持了动态版的参照编码假设和物体文件整合假设。

One research interest in exploring the mechanism of the Simon effect is to determine whether attention plays a critical role in the formation of spatial code. The Attention Shift account and the Referential Coding account have been proposed to predict the modulation effect of attention on the Simon effect. However, most studies did not find any change in the Simon effect when they manipulate different attention conditions, and accordingly, these accounts were not supported by experimental studies. By contrast, some studies did suggest that the Simon effect could be modulated by attention. Therefore, there are heated debates on whether attention could modulate the Simon effect. In conclusion, we speculate that a possible reason for the contradictory results of previous studies is that the modulation effect of attention on the Simon effect is object-based. To test our hypothesis, we used the experimental paradigm of Egly et al. （1994）. If the hypothesis holds, we will observe that the object-based instead of space-based attention affects the Simon effect. Thirty-four young participants （25 female） were recruited in this experiment. The study consisted of 24 trials full-feedback practice block and four experimental blocks of 128 trials each. In each trial, a fixation point was presented in the center of the screen, and two rectangular boxes were separately presented either above or below the fixation point, or left or right to the fixation point. After 1000 ms, one end of the rectangular box was flashed as cue for 100 ms. Then, a screen with two rectangular boxes was presented for 100 ms. After offset of that screen, the target appeared in one end of rectangular box for 100 ms, followed by a gray blank screen which was presented for 100 ms. Participants were instructed to respond as quickly and accurately as possible, once the target appeared. Finally, a fixation point was presented in the center of the screen with a random duration of 600 - 800 ms. The E-Prime package was used to present the stimuli and to record and collect data. The results showed that when the rectangular boxes were vertically arranged, the Simon effect had no significant change under the space-based and object-based attention conditions, whereas when they were horizontally arranged, the Simon effect marginally significantly increased under the object-based attention condition, but no significant change was found under the space-based attention condition. This confirms that the object-based attention can modulate the Simon effect, but the modulation effect significantly depends on the arrangement of rectangular boxes in the paradigm. This study can deepen our understanding of the relationship between attention and the Simon effect, as well as the formation mechanism of the Simon effect.