J Neurosci 2005 May;25(18):4593-604
Department of Psychology, Washington University in St. Louis, St. Louis, Missouri 63130-4899, USA.
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Cereb Cortex 2010 Jul 21;20(7):1574-85. Epub 2009 Oct 21.
Fondazione Santa Lucia Istituto di Ricovero e Cura a Carattere Scientifico, 309-00179 Rome, Italy.
Voluntary orienting of visual attention is conventionally measured in tasks with predictive central cues followed by frequent valid targets at the cued location and by infrequent invalid targets at the uncued location. This implies that invalid targets entail both spatial reorienting of attention and breaching of the expected spatial congruency between cues and targets. Here, we used event-related functional magnetic resonance imaging (fMRI) to separate the neural correlates of the spatial and expectancy components of both endogenous orienting and stimulus-driven reorienting of attention. Read More
J Cogn Neurosci 2009 Dec;21(12):2384-97
Neuroimaging Laboratory, Santa Lucia Foundation, Rome, Italy.
In everyday life, the allocation of spatial attention typically entails the interplay between voluntary (endogenous) and stimulus-driven (exogenous) attention. Furthermore, stimuli in different sensory modalities can jointly influence the direction of spatial attention, due to the existence of cross-sensory links in attentional control. Using fMRI, we examined the physiological basis of these interactions. Read More
Neuroimage 2004 Jan;21(1):318-28
Institute of Medicine, Research Centre Jülich, 52425, Jülich, Germany.
The identification of brain systems contributing to different aspects of visuospatial attention is of both clinical and theoretical interest. Cued target detection tasks provide a simple means to dissociate attentional subcomponents, such as alerting, orienting or reorienting of attention. Event-related functional magnetic resonance imaging (fMRI) was used to study neural correlates of these distinct attentional processes. Read More
Neuroimage 2005 Apr;25(3):668-83
Center for Cognitive Neuroscience, Duke University, Durham, NC 27708-0999, USA.
Neuropsychological research has consistently demonstrated that spatial attention can be anchored in one of several coordinate systems, including those defined with respect to an observer (viewer-centered), to the gravitational vector (environment-centered), or to individual objects (object-centered). In the present study, we used hemodynamic correlates of brain function to investigate the neural systems that mediate attentional control in two competing reference frames. Healthy volunteers were cued to locations defined in either viewer-centered or object-centered space to discriminate the shape of visual targets subsequently presented at the cued locations. Read More