空间-数字反应编码联合效应下冲突适应过程的ERP研究

Conflict Adaptation under the SNARC Effect: An ERP Study

为了考察被试在不能意识到任务中包含冲突的情况下的认知控制过程，将产生SNARC效应的奇偶判断任务看作是一种潜在的冲突任务。大小与反应手一致的视为一致的试次，大小与反应手不一致的视为不一致的试次。根据不一致试次之前一个试次的类型将其划分为iI(不一致—不一致，incongruent- incongruent)试次和cI(一致—不一致，congruent-incongruent)试次两种类型。对冲突适应过程的分析表明iI试次的反应时显著快于cI试次，iI试次和cI试次相比，两者的脑电在大约260~300ms的时间段内在FCz位置上差异最大。偶极子分析表明差异波的产生源定位于背侧前扣带回(dorsal anterior cingulate cortex)，这些结果与前扣带回的意识监测理论并不一致。最后结合冲突监测理论和其他解释前扣带回功能的理论对研究结果做了相应的解释，认为冲突适应可以是一个无意识的过程。

The human anterior cingulate cortex (ACC)， which is active during many conflict-monitoring tasks， is believed to participate with the prefrontal cortex in a distributed network for conscious self-regulation. The hypothesis of this study predicts that conflict-related ACC activation will occur only when the conflicting stimuli are consciously perceived. Consistent with this view， Dehaene found that subliminal conflicts are resolved without ACC contribution under the subliminal conflict paradigm.