Theta Oscillations Related to Orientation Recognition in Unattended Condition: A vMMN Study.
Theta Oscillations Related to Orientation Recognition in Unattended Condition: A vMMN Study.
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无人值守条件下与方向识别相关的 Theta 振荡：一项 vMMN 研究。
DOI：
10.3389/fnbeh.2017.00166
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发表时间：
2017
影响因子：
3
通讯作者：
Zhao L
中科院分区：
文献类型：
--
作者：
Yan T;Feng Y;Liu T;Wang L;Mu N;Dong X;Liu Z;Qin T;Tang X;Zhao L
方向是影响物体视觉加工的重要因素之一。在这项研究中，我们研究了在无人看管的情况下，是否可以自动检测到方向的变化。用视觉错配负性（vMMN）分析这一加工过程。此外，我们还研究了潜在的神经振荡活动。使用非锁相谱功率来探索与意外方向变化相关的具体频率。实验包括标准刺激（0°箭头）和偏差刺激（90°/270°箭头）。与标准刺激相比，异常刺激诱发的N170分量（刺激开始后约170 ms的负波）较大，P2分量（刺激开始后约200 ms的正波）较小。此外，vMMN是通过将标准刺激引起的事件相关电位（ERP）波形与异常刺激引起的事件相关电位波形相减而得到的。根据时频分析，与标准刺激相比，偏差刺激在δ和θ波段的波段功率增强。与以往的研究相比，我们得出结论，theta活动在方向变化引起的vMMN的产生中起重要作用。
Orientation is one of the important elements of objects that can influence visual processing. In this study, we examined whether changes in orientation could be detected automatically under unattended condition. Visual mismatch negativity (vMMN) was used to analyze this processing. In addition, we investigated the underlying neural oscillatory activity. Non-phase-locked spectral power was used to explore the specific frequency related to unexpected changes in orientation. The experiment consisted of standard (0° arrows) and deviant (90°/270° arrows) stimuli. Compared with standard stimuli, deviant stimuli elicited a larger N170 component (negative wave approximately 170 ms after the stimuli started) and a smaller P2 component (positive wave approximately 200 ms after the stimuli started). Furthermore, vMMN was obtained by subtracting the event-related potential (ERP) waveforms in response to standard stimuli from those elicited in response to deviant stimuli. According to the time–frequency analysis, deviant stimuli elicited enhanced band power compared with standard stimuli in the delta and theta bands. Compared with previous studies, we concluded that theta activity plays an important role in the generation of the vMMN induced by changes in orientation.
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