Kelly Jenna G, Matthews Nestor
Department of Psychology, Denison University, Granville, OH 43023, USA.
J Vis. 2011 May 20;11(6):10. doi: 10.1167/11.6.10.
We extended the investigation of the oblique effect in two novel ways: from stimulus-driven vision to visual attention and from space to time. Participants fixated the center of briefly flashed displays that contained a temporally varying Gabor stimulus in each of the four peripheral quadrants. Across trial blocks, we manipulated which two of the four peripheral stimuli were to be selected for a simultaneity judgment. Simultaneity judgments were significantly worse for obliquely (diagonally) attended targets than for cardinally (horizontally or vertically) attended targets, despite identical retinal stimulation across all attentional conditions. The impairment in judging the simultaneity of obliquely attended targets occurred between and within lateral hemifields, despite significantly greater temporal acuity for the left hemifield. The oblique effect in simultaneity judgments disappeared when the same targets were presented without temporally varying stimuli at distractor locations-a finding that implicates selective attention. Intriguingly, the oblique effect in excluding stimuli at distractor locations also disappeared when participants viewed the original displays but attended to spatial frequency rather than to simultaneity. These findings raise the possibility of different spatial integration windows when attending to spatial versus temporal features, even when those features are co-presented in space and time.
从刺激驱动视觉到视觉注意力，以及从空间到时间。参与者注视短暂闪烁的显示屏中心，显示屏的四个外周象限中每个象限都包含一个随时间变化的Gabor刺激。在各个试验块中，我们操纵从四个外周刺激中选择哪两个进行同时性判断。尽管在所有注意力条件下视网膜刺激相同，但对于倾斜（对角）关注的目标，同时性判断明显比对主要（水平或垂直）关注的目标更差。在外侧半视野之间和之内，判断倾斜关注目标的同时性都会受损，尽管左半视野的时间敏锐度明显更高。当在干扰位置呈现相同目标但没有随时间变化的刺激时，同时性判断中的倾斜效应消失了——这一发现暗示了选择性注意力。有趣的是，当参与者观看原始显示屏但关注空间频率而非同时性时，排除干扰位置刺激的倾斜效应也消失了。这些发现提出了一种可能性，即当关注空间特征与时间特征时，即使这些特征在空间和时间上同时呈现，也可能存在不同的空间整合窗口。
