Reflexive and preparatory selection and suppression of salient information in the right and left posterior parietal cortex

Carmel Mevorach*, Glyn W. Humphreys, Lilach Shalev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Attentional cues can trigger activity in the parietal cortex in anticipation of visual displays, and this activity may, in turn, induce changes in other areas of the visual cortex, hence, implementing attentional selection. In a recent TMS study [Mevorach, C., Humphreys, G. W., & Shalev, L. Opposite biases in salience-based selection for the left and right posterior parietal cortex. Nature Neuroscience, 9, 740-742, 2006b], it was shown that the posterior parietal cortex (PPC) can utilize the relative saliency (a nonspatial property) of a target and a distractor to bias visual selection. Furthermore, selection was lateralized so that the right PPC is engaged when salient information must be selected and the left PPC when the salient information must be ignored. However, it is not clear how the PPC implements these complementary forms of selection. Here we used on-line triple-pulse TMS over the right or left PPC prior to or after the onset of global/local displays. When delivered after the onset of the display, TMS to the right PPC disrupted the selection of the more salient aspect of the hierarchical letter. In contrast, left PPC TMS delivered prior to the onset of the stimulus disrupted responses to the lower saliency stimulus. These findings suggest that selection and suppression of saliency, rather than being "two sides of the same coin," are fundamentally different processes. Selection of saliency seems to operate reflexively, whereas suppression of saliency relies on a preparatory phase that "sets up" the system in order to effectively ignore saliency.

Original languageEnglish
Pages (from-to)1204-1214
Number of pages11
JournalJournal of Cognitive Neuroscience
Issue number6
StatePublished - Jun 2009
Externally publishedYes


FundersFunder number
Medical Research CouncilG0601568
Economic and Social Research CouncilES/F01550X/1


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