A Parametric fMRI Study of Overt and Covert Shifts of Visuospatial Attention

@article{Beauchamp2001APF,
  title={A Parametric fMRI Study of Overt and Covert Shifts of Visuospatial Attention},
  author={Michael S. Beauchamp and Laurent Petit and Timothy M. Ellmore and John E Ingeholm and James V. Haxby},
  journal={NeuroImage},
  year={2001},
  volume={14},
  pages={310-321}
}
It has recently been demonstrated that a cortical network of visuospatial and oculomotor control areas is active for covert shifts of spatial attention (shifts of attention without eye movements) as well as for overt shifts of spatial attention (shifts of attention with saccadic eye movements). Studies examining activity in this visuospatial network during attentional shifts at a single rate have given conflicting reports about how the activity differs for overt and covert shifts. To better… Expand
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References

SHOWING 1-10 OF 61 REFERENCES
Functional localization of the system for visuospatial attention using positron emission tomography.
TLDR
The two attention tasks evoked largely overlapping patterns of neural activation, supporting the existence of a general neural system for visuospatial attention with regional functional specialization. Expand
A large-scale distributed network for covert spatial attention: further anatomical delineation based on stringent behavioural and cognitive controls.
TLDR
Although the task required attention to be equally shifted to the left and to the right, eight of 10 subjects showed a greater area of activation in the right parietal cortex, consistent with the specialization of the right hemisphere for spatial attention. Expand
Cortical networks subserving pursuit and saccadic eye movements in humans: An FMRI study
TLDR
High‐field MRI was used to investigate the cortical circuitry subserving pursuit tracking in humans and compare it to that for saccadic eye movements, finding a set of activations for smooth pursuit parallels the network of oculomotor areas characterized in nonhuman primates. Expand
The functional anatomy of attention to visual motion. A functional MRI study.
Attention can enhance or modulate neural responses to stimuli at early and late stages of sensory processing. We were interested in the modulatory effect of attention to visual motion on corticalExpand
The role of visual attention in saccadic eye movements
TLDR
The relationship between saccadic eye movements and covert orienting of visual spatial attention was investigated, and it is suggested that visuospatial attention is an important mechanism in generating voluntary saccade eye movements. Expand
Functional anatomy of pursuit eye movements in humans as revealed by fMRI.
TLDR
The current findings provide the first functional imaging evidence for a distinction between two parallel cortical systems that subserve pursuit and saccadic eye movements in humans. Expand
Cortical fMRI activation produced by attentive tracking of moving targets.
TLDR
FMRI results suggest that attentive tracking is mediated by a network of areas that includes parietal and frontal regions responsible for attention shifts and eye movements and the MT complex, thought to be responsible for motion perception. Expand
Covert Visual Spatial Orienting and Saccades: Overlapping Neural Systems
TLDR
FMRI showed that common parietal and frontal regions are more activated during the covert task than the overt oculomotor condition and the possible nature of the relationship between these two operations is discussed. Expand
Primate frontal eye field activity during natural scanning eye movements.
TLDR
Visual activity during the rescan task was unaffected by portions of the image within the cell's receptive field, but increased in response to the appearance of the target light, in contrast to the visual activity of neurons during the scanning paradigm. Expand
Increased Activity in Human Visual Cortex during Directed Attention in the Absence of Visual Stimulation
TLDR
The increased activity in visual cortex in the absence of visual stimulation may reflect a top-down bias of neural signals in favor of the attended location, which derives from a fronto-parietal network. Expand
...
1
2
3
4
5
...