WOBIB: 3 - Gitelman, et al. (2002) Functional anatomy ...
 
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Darren R. Gitelman; Todd B. Parrish; Karl J. Friston; M-Marsel Mesulam. Functional anatomy of visual search: regional segregations within the frontal eye fields and effective connectivity of the superior colliculus. NeuroImage 15(4):970-82, 2002. PMID: 11906237. DOI: 10.1006/nimg.2001.1006. WOBIB: 3.

The ability to find targets embedded within complex visual environments requires the dynamic programming of visuomotor search behaviors. Functional magnetic resonance imaging was used to image subjects while they visually searched for targets embedded among foils. Visuomotor search activated the posterior parietal cortex and the frontal eye fields. Both regions showed a greater number of activated voxels on the right, consistent with the known pattern of right hemispheric dominance for spatial attention. The superior colliculus showed prominent activation in the search versus eye movement contrast, demonstrating, for the first time in humans, activation of this region specifically related to an exploratory attentional contingency. An analysis of effective connectivity demonstrated that the search-dependent variance in the activity of the superior colliculus was significantly influenced by the activity in a network of cortical regions including the right frontal eye fields and bilateral parietal and occipital cortices. These experiments also revealed the presence of a mosaic of activated sites within the frontal eye field region wherein saccadic eye movements, covert shifts of attention, and visuomotor search elicited overlapping but not identical zones of activation. In contrast to the existing literature on functional imaging, which has focused on covert shifts of spatial attention, this study helps to characterize the functional anatomy of overt spatial exploration.

Asymmetry: -0.43994 (left: -1, right: +1)

VRML2 file (167 Kb)

1 Visual exploration versus saccades. Visual search exploration versus saccade eye movement. WOEXP: 6.
2 Saccade versus central contrast. Saccadic eye movement versus central contrast. WOEXP: 7.
3 Regions correlating with superior colliculus activity. Regions correlating with superior colliculus activity under the condition of visual search but not saccadic eye movements. WOEXP: 8.


corner cube of WOBIB_3

Related - positive correlated volumes

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-3: 0.01373 Reginald B. J. Adams; Heather L. Gordon; Abigail A. Baird; Nalini Ambady; Robert E. Kleck. Effects of gaze on amygdala sensitivity to anger and fear faces. Science 300(5625):1536, 2003. PMID: 12791983. DOI: 10.1126/science.1082244. WOBIB: 86.

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