title: Cytoarchitectonic mapping of attentional selection and reorienting in parietal cortex.
abstract: 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.
authors.affiliation: Laboratory for Cognitive Neurology, KU Leuven, Belgium.
authors.forename: Céline R
authors.initials: CR
authors.lastname: Gillebert
authors.forename: Dante
authors.initials: D
authors.lastname: Mantini
authors.forename: Ronald
authors.initials: R
authors.lastname: Peeters
authors.forename: Patrick
authors.initials: P
authors.lastname: Dupont
authors.forename: Rik
authors.initials: R
authors.lastname: Vandenberghe
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D006801:Humans; D008297:Male; D009415:Nerve Net / Q000033:anatomy & histology* / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D010296:Parietal Lobe / Q000033:anatomy & histology* / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D055815:Young Adult