{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,10,4]],"date-time":"2024-10-04T04:24:48Z","timestamp":1728015888456},"reference-count":74,"publisher":"MIT Press","issue":"10","content-domain":{"domain":["direct.mit.edu"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2024,9,17]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Several models of visual search consider visual attention as part of a perceptual inference process, in which top-down priors disambiguate bottom-up sensory information. Many of these models have focused on gaze behavior, but there are relatively fewer models of covert spatial attention, in which attention is directed to a peripheral location in visual space without a shift in gaze direction. Here, we propose a biologically plausible model of covert attention during visual search that helps to bridge the gap between Bayesian modeling and neurophysiological modeling by using (1) top-down priors over target features that are acquired through Hebbian learning, and (2) spatial resampling of modeled cortical receptive fields to enhance local spatial resolution of image representations for downstream target classification. By training a simple generative model using a Hebbian update rule, top-down priors for target features naturally emerge without the need for hand-tuned or predetermined priors. Furthermore, the implementation of covert spatial attention in our model is based on a known neurobiological mechanism, providing a plausible process through which Bayesian priors could locally enhance the spatial resolution of image representations. We validate this model during simulated visual search for handwritten digits among nondigit distractors, demonstrating that top-down priors improve accuracy for estimation of target location and classification, relative to bottom-up signals alone. Our results support previous reports in the literature that demonstrated beneficial effects of top-down priors on visual search performance, while extending this literature to incorporate known neural mechanisms of covert spatial attention.<\/jats:p>","DOI":"10.1162\/neco_a_01700","type":"journal-article","created":{"date-parts":[[2024,8,14]],"date-time":"2024-08-14T18:52:30Z","timestamp":1723661550000},"page":"2201-2224","update-policy":"http:\/\/dx.doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":0,"title":["Top-Down Priors Disambiguate Target and Distractor Features in Simulated Covert Visual Search"],"prefix":"10.1162","volume":"36","author":[{"given":"Justin D.","family":"Theiss","sequence":"first","affiliation":[{"name":"University of California, Berkeley, CA 94720, U.S.A. theissjd@berkeley.edu"}]},{"given":"Michael A.","family":"Silver","sequence":"additional","affiliation":[{"name":"University of California, Berkeley, CA 94720, 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