J Cogn Neurosci 2009 Nov;21(11):2100-13
INB-3 AG Kognitive Neurologie, Research Centre Jülich, Germany.
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Brain Res 2007 Jan 14;1130(1):146-57. Epub 2006 Dec 14.
Department of Psychology, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, Taiwan 106.
The neural mechanisms of attentional orienting in visuospatial working memory for change detection were investigated. A spatial cue was provided with the onset time manipulated to allow more effective top-down control with an early cue than with a late cue. The change type was also manipulated so that accurate detection depended on color or the binding of color and location. Read More
J Cogn Neurosci 2010 Apr;22(4):761-74
Vrije Universiteit, Amsterdam, Netherlands.
It is still debated to what degree top-down and bottom-up driven attentional control processes are subserved by shared or by separate mechanisms. Interactions between these attentional control forms were investigated using a rapid event-related fMRI design, using an attentional search task. Following a prestimulus mask, target stimuli (consisting of a letter C or a mirror image of the C, enclosed in a diamond outline) were presented either at one unique location among three nontarget items (consisting of a random letter, enclosed in a circle outline; 50% probability), or at all four possible target locations (also 50% probability). Read More
Cereb Cortex 2002 Mar;12(3):318-28
Department of Experimental Psychology, University of Leipzig, Leipzig, Germany.
Target detection in visual singleton feature search is slowed when consecutive targets are defined in different visual dimensions. Behavioral data provide evidence that attentional weight needs to be shifted between dimension-specific processing modules. We found similar dimension-specific change effects in a conjunction search task, in which observers searched for an odd-one-out target defined by a unique combination of size and color or, respectively, size and motion direction. 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