{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/78410"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/78410","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Stimulus intensity effects on the steady-state visual evoked potential","abstract":"This research tests the hypothesis that the amplitude of the steady-state visual evoked potential (SSVEP), a neural response to repetitive visual stimuli, is positively correlated with stimulus intensity. SSVEPs are often used as input mechanisms for brain-computer interfaces (BCIs), systems that establish a direct communication channel between human brains and computers. User performance with SSVEP-based BCIs is dependent on the amplitude of the SSVEP response, which has been shown to be affected by stimulus parameters. In particular, previous results have shown that the SSVEP amplitude is positively correlated with parameters such as stimulus contrast, size, and viewing distance. These stimulus parameters are related to stimulus intensity, the total amount of light emitted by the stimuli, which suggests that SSVEP amplitude is also positively correlated with stimulus intensity. Such a relationship is often accepted in SSVEP-based BCI literature, but has yet to be experimentally verified. In this study, ten subjects were presented with flickering stimuli at eleven stimulus intensities. The stimuli flickered at a frequency of 7 Hz and were presented at a fixed distance using an LED panel. The SSVEP response was recorded using electroencephalography and analyzed using Fourier and canonical correlation analyses, which are both commonly used in SSVEP-based BCI systems. The results of this study show a significant positive correlation (R=0.173,p=9.122*10^(-7)) between stimulus intensity and the amplitude of the SSVEP response for the measured stimulus intensities.","abstract_html":"This research tests the hypothesis that the amplitude of the steady-state visual evoked potential (SSVEP), a neural response to repetitive visual stimuli, is positively correlated with stimulus intensity. SSVEPs are often used as input mechanisms for brain-computer interfaces (BCIs), systems that establish a direct communication channel between human brains and computers. User performance with SSVEP-based BCIs is dependent on the amplitude of the SSVEP response, which has been shown to be affected by stimulus parameters. In particular, previous results have shown that the SSVEP amplitude is positively correlated with parameters such as stimulus contrast, size, and viewing distance. These stimulus parameters are related to stimulus intensity, the total amount of light emitted by the stimuli, which suggests that SSVEP amplitude is also positively correlated with stimulus intensity. Such a relationship is often accepted in SSVEP-based BCI literature, but has yet to be experimentally verified. In this study, ten subjects were presented with flickering stimuli at eleven stimulus intensities. The stimuli flickered at a frequency of 7 Hz and were presented at a fixed distance using an LED panel. The SSVEP response was recorded using electroencephalography and analyzed using Fourier and canonical correlation analyses, which are both commonly used in SSVEP-based BCI systems. The results of this study show a significant positive correlation (R=0.173,p=9.122*10^(-7)) between stimulus intensity and the amplitude of the SSVEP response for the measured stimulus intensities.","abstract_has_math":false,"creators":["Yen, Sean Wayne"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-22T22:17:01Z","date_published":"2015-07-22T22:17:01Z","updated_at":"2026-07-22T22:26:11Z","subjects":["steady-state visual evoked potential (SSVEP)","stimulus intensity","brain-computer interfaces","brain-computer interfaces (BCIs)","electroencephalography (EEG)"],"languages":["en"],"rights":["Copyright 2015 Sean Yen"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/78410","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Yen, Sean Wayne"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-07-22T22:17:01Z","2015-05","2015-04-22","2015-5"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["steady-state visual evoked potential (SSVEP)","stimulus intensity","brain-computer interfaces","brain-computer interfaces (BCIs)","electroencephalography (EEG)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Sean Yen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/78410"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This research tests the hypothesis that the amplitude of the steady-state visual evoked potential (SSVEP), a neural response to repetitive visual stimuli, is positively correlated with stimulus intensity. SSVEPs are often used as input mechanisms for brain-computer interfaces (BCIs), systems that establish a direct communication channel between human brains and computers. User performance with SSVEP-based BCIs is dependent on the amplitude of the SSVEP response, which has been shown to be affected by stimulus parameters. In particular, previous results have shown that the SSVEP amplitude is positively correlated with parameters such as stimulus contrast, size, and viewing distance. These stimulus parameters are related to stimulus intensity, the total amount of light emitted by the stimuli, which suggests that SSVEP amplitude is also positively correlated with stimulus intensity. Such a relationship is often accepted in SSVEP-based BCI literature, but has yet to be experimentally verified. In this study, ten subjects were presented with flickering stimuli at eleven stimulus intensities. The stimuli flickered at a frequency of 7 Hz and were presented at a fixed distance using an LED panel. The SSVEP response was recorded using electroencephalography and analyzed using Fourier and canonical correlation analyses, which are both commonly used in SSVEP-based BCI systems. The results of this study show a significant positive correlation (R=0.173,p=9.122*10^(-7)) between stimulus intensity and the amplitude of the SSVEP response for the measured stimulus intensities.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Sean Yen, accepted the attached license on 2015-04-17 at 13:25.","The student, Sean Yen, submitted this Thesis for approval on 2015-04-17 at 13:36.","This Thesis was approved for publication on 2015-04-22 at 10:18.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7921 on 2015-07-22 at 10:32:40","Made available in DSpace on 2015-07-22T22:17:01Z (GMT). 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User performance with SSVEP-based BCIs is dependent on the amplitude of the SSVEP response, which has been shown to be affected by stimulus parameters. In particular, previous results have shown that the SSVEP amplitude is positively correlated with parameters such as stimulus contrast, size, and viewing distance. These stimulus parameters are related to stimulus intensity, the total amount of light emitted by the stimuli, which suggests that SSVEP amplitude is also positively correlated with stimulus intensity. Such a relationship is often accepted in SSVEP-based BCI literature, but has yet to be experimentally verified. In this study, ten subjects were presented with flickering stimuli at eleven stimulus intensities. The stimuli flickered at a frequency of 7 Hz and were presented at a fixed distance using an LED panel. The SSVEP response was recorded using electroencephalography and analyzed using Fourier and canonical correlation analyses, which are both commonly used in SSVEP-based BCI systems. The results of this study show a significant positive correlation (R=0.173,p=9.122*10^(-7)) between stimulus intensity and the amplitude of the SSVEP response for the measured stimulus intensities.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Sean Yen, accepted the attached license on 2015-04-17 at 13:25.","The student, Sean Yen, submitted this Thesis for approval on 2015-04-17 at 13:36.","This Thesis was approved for publication on 2015-04-22 at 10:18.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7921 on 2015-07-22 at 10:32:40","Made available in DSpace on 2015-07-22T22:17:01Z (GMT). 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