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Humans can voluntarily attend to a variety of visual attributes to serve behavioral goals. Voluntary attention is believed to be controlled by a network of dorsal frontoparietal areas. However, it is unknown how neural signals representing behavioral relevance (attentional priority) for different attributes are organized in this network. Computational studies have suggested that a hierarchical organization reflecting the similarity structure of the task demands provides an efficient and flexible neural representation. Here we examined the structure of attentional priority using functional magnetic resonance imaging. Participants were cued to attend to location, color, or motion direction within the same stimulus. We found a hierarchical structure emerging in frontoparietal areas, such that multivoxel patterns for attending to spatial locations were most distinct from those for attending to features, and the latter were further clustered into different dimensions (color vs motion). These results provide novel evidence for the organization of the attentional control signals at the level of distributed neural activity. The hierarchical organization provides a computationally efficient scheme to support flexible top-down control.

A Hierarchy of Attentional Priority Signals in Human Frontoparietal Cortex