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Active suppression of salient-but-irrelevant stimuli does not underlie resistance to visual interference
Biological Psychology ( IF 2.6 ) Pub Date : 2016-12-01 , DOI: 10.1016/j.biopsycho.2016.10.004
Caroline Barras 1 , Dirk Kerzel 1
Affiliation  

In visual search for a shape target, interference from salient-but-irrelevant color singletons can be resisted in feature search mode, but not in singleton detection mode. In singleton detection mode, we observed a contralateral positivity (PD) after 260-340ms, suggesting that the salient distractor was suppressed. Because RTs in singleton detection mode increased when a distractor was present, we conclude that active suppression of distractors takes time. In feature search mode, no increase in RTs and no PD to the distractor was observed, showing that resistance to interference was not accomplished by suppression. Rather, the smaller N2pc to the target in feature search than in singleton detection mode suggests that enhancement of target features avoided interference. Thus, the strong top-down set in feature search mode eliminated the need to suppress the early attend-to-me signal (corresponding to the Ppc, from 160 to 210ms) that was generated by salient stimuli independently of search mode.

中文翻译:

主动抑制显着但不相关的刺激并不是抵抗视觉干扰的基础

在对形状目标的视觉搜索中,特征搜索模式可以抵抗来自显着但不相关的颜色单例的干扰,但在单例检测模式下则不能。在单例检测模式下,我们在 260-340 毫秒后观察到对侧阳性 (PD),表明突出的干扰物被抑制。因为当干扰物存在时,单例检测模式下的 RT 会增加,所以我们得出结论,干扰物的主动抑制需要时间。在特征搜索模式下,没有观察到 RT 增加,也没有观察到干扰物的 PD,这表明对干扰的抵抗不是通过抑制来实现的。相反,与单例检测模式相比,特征搜索中目标的 N2pc 更小表明目标特征的增强避免了干扰。因此,
更新日期:2016-12-01
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