Visual mismatch negativity: New evidence from the equiprobable paradigm
Visual mismatch negativity: New evidence from the equiprobable paradigm
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DOI：
10.1111/j.1469-8986.2008.00767.x
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发表时间：
2009-03-01
期刊：
影响因子：
3.7
通讯作者：
Schroeger, Erich
中科院分区：
文献类型：
--
作者：
Kimura, Motohiro;Katayama, Jun'ichi;Schroeger, Erich
在视觉奇怪的研究中，与标准刺激相比，异常刺激会在 100-250 毫秒左右引起后部 ERP 负值。为了确定消极性的潜在过程，我们使用了等概率序列，其中五种方向的条形刺激以相同的概率呈现（每种方向控制 20%），以及奇怪序列，其中两种方向最接近的刺激以不同的概率呈现（异常 20% 和标准 80%）。与标准刺激相比，异常刺激在 100-150 毫秒左右引起两个阴性，没有半球优势，在 200-250 毫秒有右半球优势，而与对照刺激相比，异常刺激仅在 200-250 毫秒左右引起右半球优势的阴性。这些结果表明，早期消极反映了不应效应，而晚期消极反映了基于记忆比较的变化检测效应（视觉失配消极）。
In visual oddball studies, deviant compared to standard stimuli elicited a posterior negative ERP at around 100-250 ms. To determine the underlying processes of the negativity, we used the equiprobable sequence in which bar stimuli of five types of orientation were presented with equal probabilities (control 20% each) as well as the oddball sequence in which two stimuli with the closest orientation were presented with different probabilities (deviant 20% and standard 80%). Deviant compared to standard stimuli elicited two negativities at around 100-150 ms with no hemispheric dominance and 200-250 ms with right hemispheric dominance, while deviant compared to control stimuli elicited only a negativity at around 200-250 ms with right hemispheric dominance. These results suggest that the early negativity reflects refractory effect, while the late negativity reflects memory-comparison-based change detection effect (visual mismatch negativity).