失配负性
刺激(心理学)
心理学
听力学
事件相关电位
负效应
颞叶皮质
视皮层
认知心理学
偏差(统计)
认知
脑电图
神经科学
医学
计算机科学
机器学习
作者
Dagmar Müller,Urte Roeber,István Winkler,Nelson J. Trujillo‐Barreto,István Czigler,Erich Schröger
标识
DOI:10.1016/j.brainres.2012.07.016
摘要
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.
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