Journal
HUMAN BRAIN MAPPING
Volume 33, Issue 10, Pages 2477-2486Publisher
WILEY-BLACKWELL
DOI: 10.1002/hbm.21383
Keywords
exogenous; endogenous; superior parietal lobule; intraparietal sulcus; cue validity; peripheral cueing
Funding
- Ministry of Science and Technology of China [2010IM030800, 2009IM030900]
- National Nature Science Foundation of China [30921064, 90820307]
- Chinese Academy of Sciences [KSCX2-YW-R-122KSCX2-YW-R-259]
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Converging evidence from neuroimaging as well as lesion and transcranial magnetic stimulation (TMS) studies has been obtained for the involvement of right ventral posterior parietal cortex (PPC) in exogenous orienting. However, the contribution of dorsal PPC to attentional orienting, particularly endogenous orienting, is still under debate. In an informative peripheral cueing paradigm, in which the exogenous and endogenous orienting can be studied in relative isolation within a single task, we applied TMS over sub-regions of dorsal PPC to explore their possible distinct involvement in exogenous and endogenous processes. We found that disruption of the left posterior intraparietal sulcus (pIPS) weakened the attentional effects of endogenous orienting, but did not affect exogenous processes. In addition, TMS applied over the right superior parietal lobule (SPL) resulted in an overall increase in reaction times. The present study provides the causal evidence that the left pIPS plays a crucial role in voluntary orienting of visual attention, while right SPL is involved in the processing of arousal and/or vigilance. Hum Brain Mapp 33:24772486, 2012. (c) 2011 Wiley Periodicals, Inc.
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