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1-Different features are represented by different neurons. This results in binding problems if there are multiple objects.
2-Neuronal responses to features that need to be grouped together are enhanced. This solves the binding problem.
3-The response enhancements are a correlate of visual attention that is directed to the features that are grouped.
4-In a spatial cueing task the rate enhancement starts at a location and its spreads to other features at this location.
5-In a visual search task the rate enhancement starts at a shape or other feature and spreads to the location.
6-In a contour grouping task the rate enhancement spreads to all neurons that respond to segments of a curve.