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Occipital-parietal interactions during shifts of exogenous visuospatial attention: trial-dependent changes of effective connectivity.
Magn Reson Imaging. 2004 Dec; 22(10):1477-86.MR

Abstract

We studied neural interactions between brain areas involved in exogenous (stimulus-driven) control of visuospatial attention. With event-related functional magnetic resonance imaging (fMRI), we investigated changes of connectivity during shifts of spatial attention from an attended location to a previously unattended target location. Using a 3-T scanner, fMRI data were acquired from three healthy volunteers. According to a central visual cue, participants directed endogenous spatial attention to the left or the right visual hemifield for blocks of 56 s. Peripheral visual targets were presented unpredictably in either the attended hemifield (valid trials, 80%) or in the unattended hemifield (invalid trials, 20%) and participants performed a two-alternative forced-choice discrimination task with the target, irrespective of cue validity. In accordance with previous results, we found that the temporal-parietal junction (TPJ) mediates the shift of spatial attention toward stimuli presented at the unattended side (i.e., invalid trials). We critically studied the interaction between occipital areas responding to the visual stimuli and other brain regions in order to find regions functionally coupled with the occipital cortex during invalid trials. We found that the coupling between occipital areas processing visual stimuli and the TPJ selectively increased during invalid trials. Our results highlight how changes of connectivity between brain areas can describe attentional processes such as stimulus-driven shifts of spatial attention.

Authors+Show Affiliations

Neuroimaging Laboratory, Fondazione Santa Lucia, Via Ardeatina, 306-00179, Rome, Italy. i.indovina@hsantalucia.itNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15707797

Citation

Indovina, Iole, and Emiliano Macaluso. "Occipital-parietal Interactions During Shifts of Exogenous Visuospatial Attention: Trial-dependent Changes of Effective Connectivity." Magnetic Resonance Imaging, vol. 22, no. 10, 2004, pp. 1477-86.
Indovina I, Macaluso E. Occipital-parietal interactions during shifts of exogenous visuospatial attention: trial-dependent changes of effective connectivity. Magn Reson Imaging. 2004;22(10):1477-86.
Indovina, I., & Macaluso, E. (2004). Occipital-parietal interactions during shifts of exogenous visuospatial attention: trial-dependent changes of effective connectivity. Magnetic Resonance Imaging, 22(10), 1477-86.
Indovina I, Macaluso E. Occipital-parietal Interactions During Shifts of Exogenous Visuospatial Attention: Trial-dependent Changes of Effective Connectivity. Magn Reson Imaging. 2004;22(10):1477-86. PubMed PMID: 15707797.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Occipital-parietal interactions during shifts of exogenous visuospatial attention: trial-dependent changes of effective connectivity. AU - Indovina,Iole, AU - Macaluso,Emiliano, PY - 2004/10/15/received PY - 2004/10/15/accepted PY - 2005/2/15/pubmed PY - 2005/6/24/medline PY - 2005/2/15/entrez SP - 1477 EP - 86 JF - Magnetic resonance imaging JO - Magn Reson Imaging VL - 22 IS - 10 N2 - We studied neural interactions between brain areas involved in exogenous (stimulus-driven) control of visuospatial attention. With event-related functional magnetic resonance imaging (fMRI), we investigated changes of connectivity during shifts of spatial attention from an attended location to a previously unattended target location. Using a 3-T scanner, fMRI data were acquired from three healthy volunteers. According to a central visual cue, participants directed endogenous spatial attention to the left or the right visual hemifield for blocks of 56 s. Peripheral visual targets were presented unpredictably in either the attended hemifield (valid trials, 80%) or in the unattended hemifield (invalid trials, 20%) and participants performed a two-alternative forced-choice discrimination task with the target, irrespective of cue validity. In accordance with previous results, we found that the temporal-parietal junction (TPJ) mediates the shift of spatial attention toward stimuli presented at the unattended side (i.e., invalid trials). We critically studied the interaction between occipital areas responding to the visual stimuli and other brain regions in order to find regions functionally coupled with the occipital cortex during invalid trials. We found that the coupling between occipital areas processing visual stimuli and the TPJ selectively increased during invalid trials. Our results highlight how changes of connectivity between brain areas can describe attentional processes such as stimulus-driven shifts of spatial attention. SN - 0730-725X UR - https://www.unboundmedicine.com/medline/citation/15707797/Occipital_parietal_interactions_during_shifts_of_exogenous_visuospatial_attention:_trial_dependent_changes_of_effective_connectivity_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0730-725X(04)00304-2 DB - PRIME DP - Unbound Medicine ER -