Honda Hitoshi
Department of Psychology, Faculty of Humanities and Center for Transdisciplinary Research, Niigata University, 8050 Ikarashi 2-no-cho, Niigata 950-2181, Japan.
Vision Res. 2005 Oct;45(21):2773-9. doi: 10.1016/j.visres.2004.06.026.
Saccadic responses to a visual target are delayed if another visual stimulus (distractor) is presented in the visual field opposite to the target (remote distractor effect). In the present study, two experiments were conducted to investigate how the remote distractor effect is modulated by the presence or absence of a central fixation stimulus. In both experiments, when a fixation stimulus was continuously presented even after target presentation, the remote distractor effect decreased. The reduction of the remote distractor effect was observed for all distractor positions examined (1.5 degrees -9.0 degrees eccentricity), and prominent especially when targets were presented at more peripheral positions (9.0 degrees and 10 degrees eccentricity). It was concluded that these results can be well explained by recent findings on inhibitory interactions among subpopulations of neurons in the superior colliculus.
如果在与目标相对的视野中呈现另一个视觉刺激（干扰物），对视觉目标的扫视反应就会延迟（远距离干扰物效应）。在本研究中，进行了两项实验，以研究远距离干扰物效应如何受到中央注视刺激存在与否的调节。在这两项实验中，即使在呈现目标后仍持续呈现注视刺激时，远距离干扰物效应都会降低。在所检查的所有干扰物位置（离心率1.5度 - 9.0度）都观察到了远距离干扰物效应的降低，并且当目标出现在更周边的位置（离心率9.0度和10度）时尤为明显。得出的结论是，这些结果可以通过上丘神经元亚群之间抑制性相互作用的最新研究结果得到很好的解释。
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