Transcranial direct current stimulation (tDCS) reveals a dissociation between SNARC and MARC effects: Implication for the polarity correspondence account

摘要: The concept of stimulus response compatibility (SRC) refers to the existence a privileged association between specific feature and feature. Two examples SRC are Spatial Numerical Association Response Codes (SNARC) Markedness (MARC) effects. According polarity correspondence principle, these two effects occur because match most salient dimensions response. Specifically, SNARC effect would be caused by right-sided responses large numbers, while even numbers give rise MARC effect. aim present study was test validity principle in explaining To this end, we applied transcranial direct current stimulation (tDCS) over left right posterior parietal cortex (PPC), which is thought neural basis salience processing, during parity judgement task. Results showed that cathodal tDCS PPC significantly reduced but did not affect effect, suggesting dissociation That is, rely on processing mechanism, whereas not. Despite interpretation need further experimental confirmations (i.e., testing different tasks or using montages), our results suggest can plausible explanation only for