Wolbers Thomas, Schoell Eszter D, Verleger Rolf, Kraft Stefanie, McNamara Adam, Jaskowski Piotr, Büchel Christian
NeuroImage Nord, Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Germany.
Cereb Cortex. 2006 Jun;16(6):857-64. doi: 10.1093/cercor/bhj029. Epub 2005 Aug 31.
Human behavior can be influenced by information that is not consciously perceived. Recent behavioral and electrophysiological evidence suggests, however, that the processing of subliminal stimuli is not completely beyond an observer's conscious control. The present study aimed to characterize the cortical network that implements strategic control over interfering subliminal information at multiple stages. Fourteen participants underwent functional magnetic resonance imaging (fMRI) scanning while performing a metacontrast masking paradigm. We systematically varied the amount of conflicting versus non-conflicting trials across experimental blocks, and behavioral performance demonstrated strategic effects whenever a high proportion of subliminal prime stimuli induced response competition. A psychophysiological interaction analysis revealed the pre-supplementary motor area (pre-SMA) to exhibit context-dependent covariation with activation in the lateral occipital complex (LOC) and the putamen. The pre-SMA thereby appears to fulfill a superordinate function in the control of processing subliminal information by simultaneously modulating perceptual analysis and motor selection.
人类行为会受到未被有意识感知的信息的影响。然而，最近的行为和电生理证据表明，阈下刺激的处理并非完全超出观察者的意识控制。本研究旨在描述在多个阶段对干扰性阈下信息实施策略控制的皮层网络。14名参与者在进行元对比掩蔽范式时接受了功能磁共振成像（fMRI）扫描。我们在实验块中系统地改变冲突试验与非冲突试验的数量，并且每当高比例的阈下启动刺激引发反应竞争时，行为表现就会显示出策略效应。心理生理交互作用分析显示，前辅助运动区（pre-SMA）与枕外侧复合体（LOC）和壳核的激活呈现出依赖于情境的共变关系。因此，前辅助运动区似乎通过同时调节知觉分析和运动选择，在控制阈下信息处理方面发挥着上级功能。
