期刊
NEUROIMAGE
卷 67, 期 -, 页码 257-272出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2012.11.026
关键词
Spatial cueing; Invalidity; Biased competition; Intraparietal sulcus; Temporoparietal junction
资金
- Research Foundation Flanders (FWO), Flanders, Belgium [G0668.07 ESF Euro Cores Program]
- Katholieke Universiteit Leuven [OT/08/56]
- Federaal Wetenschapsbeleid belspo (Inter-University Attraction Pole) [P6/29]
Selection and reorienting are two fundamental aspects of spatial attention. By means of event-related fMRI in a total of 26 subjects, we localized these two processes within a same experiment applying a probabilistic cytoarchitectonic reference frame. In a classical spatial cueing paradigm, the target was presented at the cued location either alone (60% of trials) or in combination with a contralateral distracter ('competition trials', 20% of trials), or at a location opposite to the cued location ('invalidly cued trials', 20% of trials). In a sensory control experiment we differentiated between the attentional and the sensory effects of the distracter. In areas hIP1 and hIP3, competition trials exerted a significantly stronger attentional effect than invalidity trials. Conversely, area PF in the right hemisphere showed an invalidity effect in the absence of competition effect. A third type of response was found in areas PFm and PGa which showed both an invalidity and a competition effect. The combined study of selection and reorienting using a cytoarchitectonic reference frame enabled us to resolve the wide between-study variance in temporoparietal coordinates associated with the invalidity effect. Furthermore, the study demonstrated within a same experiment a functional dissociation between reorienting and selection in parietal cortex. (C) 2012 Elsevier Inc. All rights reserved.
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