Feedforward attentional selection in sensory cortex

Author:

Westerberg Jacob A.ORCID,Schall Jeffrey D.ORCID,Woodman Geoffrey F.,Maier AlexanderORCID

Abstract

AbstractSalient objects grab attention because they stand out from their surroundings. Whether this phenomenon is accomplished by bottom-up sensory processing or requires top-down guidance is debated. We tested these alternative hypotheses by measuring how early and in which cortical layer(s) neural spiking distinguished a target from a distractor. We measured synaptic and spiking activity across cortical columns in mid-level area V4 of male macaque monkeys performing visual search for a color singleton. A neural signature of attentional capture was observed in the earliest response in the input layer 4. The magnitude of this response predicted response time and accuracy. Errant behavior followed errant selection. Because this response preceded top-down influences and arose in the cortical layer not targeted by top-down connections, these findings demonstrate that feedforward activation of sensory cortex can underlie attentional priority.

Funder

U.S. Department of Health & Human Services | NIH | National Eye Institute

Human Frontier Science Program

Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada

U.S. Department of Health & Human Services | NIH | NIH Office of the Director

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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