{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22739"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22739","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Using event-related potentials to monitor the time course of mental processing during eye fixations in reading","abstract":"A new method for measuring the temporal course of processing events that take place during eye fixations in reading was tested. The method was employed to determine the earliest point in time that orthographic information is utilized during an eye fixation in normal reading. Right handed male and female university students silently read sentences presented one at a time on a CRT while their eye movements and scalp recorded electroencephalographic (EEG) brain activity were monitored. Average event-related potentials (ERPs) were derived separately for control and experimental conditions by time-locking ERP epochs to the beginning of the first fixation on critical word locations containing either a control word or orthographically inappropriate letter string (i.e., brain or iarnb). The most prominent effect of encountering orthographically inappropriate letter strings during reading was the generation of a late negativity similar to that observed by other researchers who have manipulated semantic aspects of the language. A primary purpose for conducting this study was to determine whether scalp recorded brain activity would show effects of encountering violations of language constraints earlier than they are revealed in eye movement recordings. To answer this question grand averages for control and experimental conditions at each of four recording sites (Cz, Pz, P$\\sb3$, and P$\\sb4$) were compared to see how soon, after the beginning of the initial fixation on a critical word location, they separated. The earliest point in time at which control and orthographic grand averages separated as a result of the late negative component (210 msec at lateral sites P$\\sb3$ and P$\\sb4$; 270 msec at midline sites Cz and Pz) was later than the point in time at which differences have been observed in eye movement data (as early as 140-159 msec). This thesis explains various possible sources of confounding variance that may be making an early ERP effect difficult to detect: EEG activity produced by making saccadic eye movements, ERP component latency jitter, and component overlap. This study did establish the feasibility of using ERPs to study mental processing in ongoing tasks, like reading, by time-looking ERP epochs to the beginning of critical eye fixations.","abstract_html":"A new method for measuring the temporal course of processing events that take place during eye fixations in reading was tested. The method was employed to determine the earliest point in time that orthographic information is utilized during an eye fixation in normal reading. Right handed male and female university students silently read sentences presented one at a time on a CRT while their eye movements and scalp recorded electroencephalographic (EEG) brain activity were monitored. Average event-related potentials (ERPs) were derived separately for control and experimental conditions by time-locking ERP epochs to the beginning of the first fixation on critical word locations containing either a control word or orthographically inappropriate letter string (i.e., brain or iarnb). The most prominent effect of encountering orthographically inappropriate letter strings during reading was the generation of a late negativity similar to that observed by other researchers who have manipulated semantic aspects of the language. A primary purpose for conducting this study was to determine whether scalp recorded brain activity would show effects of encountering violations of language constraints earlier than they are revealed in eye movement recordings. To answer this question grand averages for control and experimental conditions at each of four recording sites (Cz, Pz, P$\\sb3$, and P$\\sb4$) were compared to see how soon, after the beginning of the initial fixation on a critical word location, they separated. The earliest point in time at which control and orthographic grand averages separated as a result of the late negative component (210 msec at lateral sites P$\\sb3$ and P$\\sb4$; 270 msec at midline sites Cz and Pz) was later than the point in time at which differences have been observed in eye movement data (as early as 140-159 msec). This thesis explains various possible sources of confounding variance that may be making an early ERP effect difficult to detect: EEG activity produced by making saccadic eye movements, ERP component latency jitter, and component overlap. This study did establish the feasibility of using ERPs to study mental processing in ongoing tasks, like reading, by time-looking ERP epochs to the beginning of critical eye fixations.","abstract_has_math":true,"creators":["Reddix, Michael Douglas"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Education","degree_department":null,"school":null,"contributors":["McConkie, George W."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:49:51Z","date_published":"2011-05-07T13:49:51Z","updated_at":"2026-07-22T22:25:20Z","subjects":["Education, Reading","Psychology, Experimental","Psychology, Physiological"],"languages":["eng"],"rights":["Copyright 1989 Reddix, Michael Douglas"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010995","(UMI)AAI9010995"],"render_values":[{"text":"AAI9010995","href":null,"code":true},{"text":"(UMI)AAI9010995","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22739","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["McConkie, George W."]},{"key":"dc:creator","label":"Author","values":["Reddix, Michael Douglas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:49:51Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Education"]},{"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":["Education, Reading","Psychology, Experimental","Psychology, Physiological"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1989 Reddix, Michael Douglas"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010995","(UMI)AAI9010995","http://hdl.handle.net/2142/22739"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["A new method for measuring the temporal course of processing events that take place during eye fixations in reading was tested. The method was employed to determine the earliest point in time that orthographic information is utilized during an eye fixation in normal reading. Right handed male and female university students silently read sentences presented one at a time on a CRT while their eye movements and scalp recorded electroencephalographic (EEG) brain activity were monitored. Average event-related potentials (ERPs) were derived separately for control and experimental conditions by time-locking ERP epochs to the beginning of the first fixation on critical word locations containing either a control word or orthographically inappropriate letter string (i.e., brain or iarnb). The most prominent effect of encountering orthographically inappropriate letter strings during reading was the generation of a late negativity similar to that observed by other researchers who have manipulated semantic aspects of the language. A primary purpose for conducting this study was to determine whether scalp recorded brain activity would show effects of encountering violations of language constraints earlier than they are revealed in eye movement recordings. To answer this question grand averages for control and experimental conditions at each of four recording sites (Cz, Pz, P$\\sb3$, and P$\\sb4$) were compared to see how soon, after the beginning of the initial fixation on a critical word location, they separated. The earliest point in time at which control and orthographic grand averages separated as a result of the late negative component (210 msec at lateral sites P$\\sb3$ and P$\\sb4$; 270 msec at midline sites Cz and Pz) was later than the point in time at which differences have been observed in eye movement data (as early as 140-159 msec). This thesis explains various possible sources of confounding variance that may be making an early ERP effect difficult to detect: EEG activity produced by making saccadic eye movements, ERP component latency jitter, and component overlap. This study did establish the feasibility of using ERPs to study mental processing in ongoing tasks, like reading, by time-looking ERP epochs to the beginning of critical eye fixations.","Made available in DSpace on 2011-05-07T13:49:51Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9010995.pdf: 7218646 bytes, checksum: c6cf09cbd76ca6593fdaa44f6d3ad2f5 (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:59:40Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:28:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Using event-related potentials to monitor the time course of mental processing during eye fixations in reading"]}]}],"canonical_facts":{"dc:contributor":["McConkie, George W."],"dc:creator":["Reddix, Michael Douglas"],"dc:date":["2011-05-07T13:49:51Z","10000-01-01","1989"],"dc:description":["A new method for measuring the temporal course of processing events that take place during eye fixations in reading was tested. The method was employed to determine the earliest point in time that orthographic information is utilized during an eye fixation in normal reading. Right handed male and female university students silently read sentences presented one at a time on a CRT while their eye movements and scalp recorded electroencephalographic (EEG) brain activity were monitored. Average event-related potentials (ERPs) were derived separately for control and experimental conditions by time-locking ERP epochs to the beginning of the first fixation on critical word locations containing either a control word or orthographically inappropriate letter string (i.e., brain or iarnb). The most prominent effect of encountering orthographically inappropriate letter strings during reading was the generation of a late negativity similar to that observed by other researchers who have manipulated semantic aspects of the language. A primary purpose for conducting this study was to determine whether scalp recorded brain activity would show effects of encountering violations of language constraints earlier than they are revealed in eye movement recordings. To answer this question grand averages for control and experimental conditions at each of four recording sites (Cz, Pz, P$\\sb3$, and P$\\sb4$) were compared to see how soon, after the beginning of the initial fixation on a critical word location, they separated. The earliest point in time at which control and orthographic grand averages separated as a result of the late negative component (210 msec at lateral sites P$\\sb3$ and P$\\sb4$; 270 msec at midline sites Cz and Pz) was later than the point in time at which differences have been observed in eye movement data (as early as 140-159 msec). This thesis explains various possible sources of confounding variance that may be making an early ERP effect difficult to detect: EEG activity produced by making saccadic eye movements, ERP component latency jitter, and component overlap. This study did establish the feasibility of using ERPs to study mental processing in ongoing tasks, like reading, by time-looking ERP epochs to the beginning of critical eye fixations.","Made available in DSpace on 2011-05-07T13:49:51Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9010995.pdf: 7218646 bytes, checksum: c6cf09cbd76ca6593fdaa44f6d3ad2f5 (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:59:40Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:28:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9010995","(UMI)AAI9010995","http://hdl.handle.net/2142/22739"],"dc:language":["eng"],"dc:rights":["Copyright 1989 Reddix, Michael Douglas"],"dc:subject":["Education, Reading","Psychology, Experimental","Psychology, Physiological"],"dc:title":["Using event-related potentials to monitor the time course of mental processing during eye fixations in reading"],"dc:type":["text"],"thesis:degree_discipline":["Education"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:20Z"}