Institute for Psychology, Hungarian Academy of Sciences, Budapest, Hungary.
Neuropsychologia. 2010 Apr;48(5):1277-82. doi: 10.1016/j.neuropsychologia.2009.12.029. Epub 2009 Dec 28.
Event-related potentials (ERPs) were measured in response to frequent (standard) and infrequent (deviant) task-irrelevant bar patterns. The constituent bars of the deviant patterns had either different orientation or different color than the bars of the standard. The task was the detection of either the orientation or the color change of a centrally presented shape. The deviant minus the standard ERP difference produced posterior negativity and was identified as visual mismatch negativity (vMMN). On the one hand, vMMN to orientation deviancy had smaller amplitude in the task demanding detection of the orientation change, and vMMN to color deviancy had smaller amplitude in the task demanding the color change. On the other hand, irrelevant deviancy influenced the task-performance. Reaction time (RT) to the orientation change of the target shape was longer in sequences with orientation change in the background, whereas RT to color change was longer in sequences with color change in the background. This interaction suggested that there was competition between the processing of irrelevant stimuli that share characteristics of task-related changes and target-related processing.
事件相关电位（ERPs）是在对频繁（标准）和不频繁（偏差）的与任务无关的条形图案的反应中进行测量的。偏差模式的组成条具有与标准条不同的方向或不同的颜色。任务是检测中央呈现形状的方向或颜色变化。偏差减去标准 ERP 差异产生了后部负性，并被确定为视觉失配负性（vMMN）。一方面，在要求检测方向变化的任务中，朝向偏差的 vMMN 幅度较小，而在要求颜色变化的任务中，颜色偏差的 vMMN 幅度较小。另一方面，无关的偏差会影响任务表现。在背景中存在方向变化的序列中，目标形状的方向变化的反应时间（RT）较长，而在背景中存在颜色变化的序列中，颜色变化的 RT 较长。这种相互作用表明，在处理与任务相关变化和目标相关处理共享特征的无关刺激之间存在竞争。
