Distinct roles of prefrontal and parietal areas in the encoding of attentional priority

Proceedings of the National Academy of Sciences of the United States of America
Panagiotis SapountzisGeorgia G Gregoriou

Abstract

When searching for an object in a crowded scene, information about the similarity of stimuli to the target object is thought to be encoded in spatial priority maps, which are subsequently used to guide shifts of attention and gaze to likely targets. Two key cortical areas that have been described as holding priority maps are the frontal eye field (FEF) and the lateral intraparietal area (LIP). However, little is known about their distinct contributions in priority encoding. Here, we compared neuronal responses in FEF and LIP during free-viewing visual search. Although saccade selection signals emerged earlier in FEF, information about the target emerged at similar latencies in distinct populations within the two areas. Notably, however, effects in FEF were more pronounced. Moreover, LIP neurons encoded the similarity of stimuli to the target independent of saccade selection, whereas in FEF, encoding of target similarity was strongly modulated by saccade selection. Taken together, our findings suggest hierarchical processing of saccade selection signals and parallel processing of feature-based attention signals within the parietofrontal network with FEF having a more prominent role in priority encoding. Furthermore, they suggest...Continue Reading

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Citations

Oct 22, 2019·Movement Disorders : Official Journal of the Movement Disorder Society·Elena PretegianiLance M Optican
Dec 18, 2019·Nature Communications·Narcisse P BichotRobert Desimone
Sep 14, 2019·Annual Review of Psychology·Ian C Fiebelkorn, Sabine Kastner
Jan 1, 2019·Visual Cognition·Kaleb A LoweJeffrey D Schall
Dec 29, 2020·Current Opinion in Neurobiology·Bijan PesaranRyan Shewcraft

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