{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/122206"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/122206","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"A computational model of serial and parallel processing in visual search","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01","abstract_html":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01","abstract_has_math":false,"creators":["Heaton, Rachel Flood"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Psychology","degree_department":null,"school":null,"contributors":["Wickesberg, Robert","Doumas, Leonidas A A","Beck, Diane","Evans, Benjamin D","Livengood, Jonathan","Wang, Ranxiao","Hummel, John E"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-12","date_published":"2023-12","updated_at":"2026-07-22T22:25:00Z","subjects":["Visual Search","Relations","Relational Search","Attention","Computational Modeling","Vision","Visual Representations"],"languages":["en","eng"],"rights":["Copyright © 2023 Rachel Flood Heaton"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/122206","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wickesberg, Robert","Doumas, Leonidas A A","Beck, Diane","Evans, Benjamin D","Livengood, Jonathan","Wang, Ranxiao","Hummel, John E"]},{"key":"dc:creator","label":"Author","values":["Heaton, Rachel Flood"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-12","2023-10-13"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Psychology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Visual Search","Relations","Relational Search","Attention","Computational Modeling","Vision","Visual Representations"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright © 2023 Rachel Flood Heaton"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/122206"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01","The student, Rachel Heaton, accepted the attached license on 2023-10-10 at 19:16.","The student, Rachel Heaton, submitted this Dissertation for approval on 2023-10-10 at 19:45.","This Dissertation was approved for publication on 2023-10-13 at 13:52.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19855 on 2024-03-01 at 13:47:55","The following is a dissertation aimed at understanding what the various phenomena in visual search teach us about the nature of human ventral visual representations and processes. I first review some of the major empirical findings in the study of visual search. I next present a theory of visual search in terms of what I believe these findings suggest about the representations and processes underlying ventral visual processing. These principles are instantiated in a computational model called CASPER (Concurrent Attention: Serial and Parallel Evaluation with Relations), originally developed by Hummel that I have adapted to account for a range of phenomena in visual search. I next present simulations using CASPER to account for some of the major empirical findings in the literature on visual search. I then describe an extension of the CASPER model to account for our ability to search for visual items defined not simply by the features composing those items but by the spatial relations among those features. Seven experiments (four main experiments and three replications) are described that test CASPER’s predictions about relational search. Finally, I evaluate the fit between CASPER’s predictions and the empirical findings and show with three additional simulations that CASPER can account for negative acceleration in search functions for relational stimuli if one postulates that the visual system is leveraging an emergent feature that bypasses relational processing."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["A computational model of serial and parallel processing in visual search"]}]}],"canonical_facts":{"dc:contributor":["Wickesberg, Robert","Doumas, Leonidas A A","Beck, Diane","Evans, Benjamin D","Livengood, Jonathan","Wang, Ranxiao","Hummel, John E"],"dc:creator":["Heaton, Rachel Flood"],"dc:date":["2023-12","2023-10-13"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01","The student, Rachel Heaton, accepted the attached license on 2023-10-10 at 19:16.","The student, Rachel Heaton, submitted this Dissertation for approval on 2023-10-10 at 19:45.","This Dissertation was approved for publication on 2023-10-13 at 13:52.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19855 on 2024-03-01 at 13:47:55","The following is a dissertation aimed at understanding what the various phenomena in visual search teach us about the nature of human ventral visual representations and processes. I first review some of the major empirical findings in the study of visual search. I next present a theory of visual search in terms of what I believe these findings suggest about the representations and processes underlying ventral visual processing. These principles are instantiated in a computational model called CASPER (Concurrent Attention: Serial and Parallel Evaluation with Relations), originally developed by Hummel that I have adapted to account for a range of phenomena in visual search. I next present simulations using CASPER to account for some of the major empirical findings in the literature on visual search. I then describe an extension of the CASPER model to account for our ability to search for visual items defined not simply by the features composing those items but by the spatial relations among those features. Seven experiments (four main experiments and three replications) are described that test CASPER’s predictions about relational search. Finally, I evaluate the fit between CASPER’s predictions and the empirical findings and show with three additional simulations that CASPER can account for negative acceleration in search functions for relational stimuli if one postulates that the visual system is leveraging an emergent feature that bypasses relational processing."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/122206"],"dc:language":["en","eng"],"dc:rights":["Copyright © 2023 Rachel Flood Heaton"],"dc:subject":["Visual Search","Relations","Relational Search","Attention","Computational Modeling","Vision","Visual Representations"],"dc:title":["A computational model of serial and parallel processing in visual search"],"dc:type":["text"],"thesis:degree_discipline":["Psychology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:00Z"}