Impact of lower- vs. upper-hemifield presentation on automatic colour-deviance detection: A visual mismatch negativity study
Impact of lower- vs. upper-hemifield presentation on automatic colour-deviance detection: A visual mismatch negativity study
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DOI：
10.1016/j.brainres.2012.07.016
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发表时间：
2012-09-07
期刊：
影响因子：
2.9
通讯作者：
Schroeger, Erich
中科院分区：
文献类型：
--
作者：
Mueller, Dagmar;Roeber, Urte;Schroeger, Erich
从视觉环境的时间背景中自动处理偏差已成为视觉认知科学的一个重要课题，通常使用视觉错配负性（vMMN）进行研究。事件相关电位（ERP）成分是由一个不规则的刺激（例如，红色的圆盘）在一系列刺激（例如，绿色的圆盘）中呈现，包括一个时间规律性（例如，颜色重复）。我们确定了不规则刺激的下半脑区和上半脑区呈现对vMMN的影响，同时使用全脑区刺激显示控制空间注意的持续转移。在200-280 ms的潜伏期内，下半脑区出现的异常引起的vMMN比上半脑区出现的异常引起的vMMN大。然而，在这种不对称之前，在较早的潜伏期（110-150 ms）就已经出现了与偏差相关的半场效应，其中上半场偏差引发了正电位，而下半场偏差则没有。通过可变分辨率电磁断层扫描（VARETA），早期偏差相关活动定位于视皮层的视网膜组织区域（ba17 /18）， vmmn源定位于枕中/上回，颞叶视觉流的更高区域，以及ba17 /18。我们认为，上半野/下半野vMMN不对称至少部分依赖于视觉皮层视网膜组织区域产生的早期偏差相关活动的半野依赖性差异敏感性。然而，对下视半球出现的偏差的优越的自动处理也可能有助于这种效果。(C) 2012 Elsevier B.V.版权所有
The automatic processing of deviances from the temporal context of the visual environment has become an important topic in visual cognitive sciences, which is often investigated using the visual mismatch negativity (vMMN). This event-related potential (ERP) component is elicited by an irregular stimulus (e.g., a red disc) presented in a series of stimuli (e.g., green discs) comprising a temporal regularity (e.g., colour repetition). We determined the influence of lower- vs. upper-hemifield presentation of the irregular stimulus on the vMMN while using whole-field stimulus displays controlling for sustained shifts in spatial attention. Deviances presented in the lower hemifield elicited a larger vMMN than the ones presented in the upper hemifield at a latency of 200-280 ms. However, this asymmetry was preceded by deviance-related hemifield effects already emerging at an earlier latency (110-150 ms), where upper-hemifield deviances elicited a positive potential but lower-hemifield deviances did not. With variable resolution electromagnetic tomography (VARETA) early deviance-related activity was localised to retinotopically organised regions of the visual cortex (BA 17/18) and vMMN-sources were localised to the middle/superior occipital gyrus, to higher areas along the temporal visual stream, but also to BA 17/18. We argue that the upper/lower-hemifield vMMN asymmetry relies at least partially on the hemifield-dependent differential sensitivity of early deviance-related activity generated in retinotopically organised regions of the visual cortex. However, a superior automatic processing of deviances presented in the lower visual hemifield may also contribute to the effect. (C) 2012 Elsevier B.V. All rights reserved.