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首页> 外文期刊>The European Journal of Neuroscience >Visual mismatch negativity is sensitive to symmetry as a perceptual category
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Visual mismatch negativity is sensitive to symmetry as a perceptual category

机译：视觉失配否定性对对称性敏感，属于感知类别

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We investigated the sensitivity of visual mismatch negativity (vMMN) to an abstract and non-semantic category, vertical mirror symmetry. Event-related potentials (ERPs) elicited by random and symmetric square patterns, delivered in passive oddball paradigm (participants played a video game), were recorded. In one of the conditions, symmetric patterns were frequent (standard) stimuli and the random patterns were infrequent (deviant) stimuli; in the other condition, the probabilities were reversed. We compared the ERPs elicited by symmetric stimuli as deviants and as standards, and, similarly, the ERPs elicited by the random deviants and random standards. As the difference between the ERPs elicited by random deviant and random standard stimuli, a posterior negativity emerged in two latency ranges (112-120 and 284-292 ms). These negativities were considered to be vMMN components. We suggest that the two vMMN components are organised in cascade error signals. However, there was no significant difference between the ERPs elicited by symmetric deviants and those elicited by symmetric standards. The emergence of vMMN in response to the deviant random stimuli is considered to be a deviation of a perceptual category (in the symmetric standard sequence presented). Accordingly, random stimuli acquired no perceptual category; for this reason, the symmetric deviant (in the random standard sequence presented) elicited no vMMN. The results show that the memory system underlying vMMN is capable of coding perceptual categories such as bilateral symmetry, even if the stimulus patterns are unrelated to the ongoing behavior. ? 2012 Federation of European Neuroscience Societies and Blackwell Publishing Ltd.
机译：我们调查了视觉失配否定性（vMMN）对抽象和非语义类别（垂直镜像对称）的敏感性。记录由被动和奇异球范例（参与者玩电子游戏）传递的随机和对称正方形图案引起的事件相关电位（ERP）。在一种情况下，对称模式是频繁的（标准）刺激，而随机模式是很少的（异常）刺激;在另一种情况下，概率是相反的。我们比较了对称刺激引起的ERPs作为偏差和标准，同样，随机偏差和随机标准引起的ERPs也进行了比较。由于随机偏差和随机标准刺激引起的ERP之间的差异，后阴性在两个潜伏范围（112-120和284-292 ms）中出现。这些负面因素被认为是vMMN组件。我们建议将两个vMMN组件按级联错误信号进行组织。但是，由对称偏差引起的ERP与由对称标准引起的ERP之间没有显着差异。 vMMN响应异常随机刺激的出现被认为是感知类别的偏差（在所示的对称标准序列中）。因此，随机刺激没有获得知觉类别。由于这个原因，对称偏差（在给出的随机标准序列中）不会引起vMMN。结果表明，即使刺激模式与正在进行的行为无关，vMMN底层的存储系统也能够编码诸如双边对称之类的感知类别。 ？ 2012年欧洲神经科学学会联合会和布莱克韦尔出版有限公司。

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