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Location- or feature-based targeting of peripheral attention
R Vandenberghe1, D R Gitelman, T B Parrish
1Cognitive Neurology and Alzheimer's Disease Center, Northwestern University Medical School, Chicago, Illinois, USA.
Neuroimage
|August 30, 2001
Summary
The right inferior parietal cortex is crucial for location-based attention, showing increased activity when attention is directed by spatial cues rather than color cues. This region supports spatially focal attention across both visual fields.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Directing attention is essential for processing information.
- Attention can be guided by features (e.g., color) or locations in space.
Purpose of the Study:
- To investigate the neural correlates of feature-based versus location-based attention using fMRI.
- To determine the role of the right inferior parietal lobule in different attentional modes.
Main Methods:
- Event-related functional magnetic resonance imaging (fMRI).
- Participants responded to shape-matching targets cued by either location or color.
- Analysis of brain activity, particularly in the inferior parietal lobule.
Main Results:
- The right inferior parietal lobule showed greater activation for location-based attention compared to feature-based (color) attention.
- Activation in this region was similar for leftward and rightward attentional shifts.
- Location-based cues led to a focal expectancy, while feature-based cues led to a global expectancy.
Conclusions:
- The right inferior parietal cortex selectively mediates location-based and spatially focal attention.
- This region plays a role in attentional deployment to both left and right visual fields.
- Findings support models of right hemispheric dominance in spatial attention.