Matches in SemOpenAlex for { <https://semopenalex.org/work/W2078408520> ?p ?o ?g. }
Showing items 1 to 67 of
67
with 100 items per page.
- W2078408520 endingPage "681" @default.
- W2078408520 startingPage "681" @default.
- W2078408520 abstract "Purpose: To investigate the effects of attention on the response contrast function of the BOLD response of the visual cortex, the results of passive viewing were compared to that of a 2-back memory task, which diverted attention. Methods: A randomly reversing, scaled dartboard display, typically used for multifocal VEP experiments, was presented at 6 contrasts ranging from 0 to 100% during whole brain functional imaging. A central fixation cross, which also served as the target of the task, was presented as a random sequence of red and green 0.5s flashes every 2s. The subjects viewed the display either passively or while performing a 2-back memory task. Thus, there were 12 (6 contrast levels X 2 viewing) conditions. Each of 4 runs contained 12 16s blocks separated with 20s rest periods. 8 subjects participated. The data were analyzed using a mixed effect analysis (FSL software). V1 was determined using standard retinotopic techniques (BrainVoyager). Results: The response log contrast function of the BOLD activation at the visual cortex was approximately linear for both attention conditions. The BOLD signal from V1 was only slightly reduced under the 2-back condition. However, other brain regions including medial frontal gyrus, insula, higher visual cortex, and cuneus showed large differences between the two tasks. In particular an extensive negative BOLD response (NBR) was observed during the 2-back task. The NBR differed from the V1 positive response in two ways. First,it was not contrast dependent, i.e.the NBR was approximately the same for 0% and 100% contrast. Second, the NBR exhibited a different time course than the positive BOLD signal , ending slightly more abruptly. Conclusion: Diverting visual attention while viewing a reversing dartboard display appears to exert a minimal affect on the contrast response function in V1. However, an extensive negative BOLD response was induced outside of V1 during the 2-back task suggesting a widely distributed task-dependent mechanism." @default.
- W2078408520 created "2016-06-24" @default.
- W2078408520 creator A5010686731 @default.
- W2078408520 creator A5032832886 @default.
- W2078408520 creator A5042574571 @default.
- W2078408520 creator A5074999356 @default.
- W2078408520 date "2010-03-17" @default.
- W2078408520 modified "2023-09-26" @default.
- W2078408520 title "The effect of attention and contrast on the BOLD response in V1 and beyond" @default.
- W2078408520 doi "https://doi.org/10.1167/5.8.681" @default.
- W2078408520 hasPublicationYear "2010" @default.
- W2078408520 type Work @default.
- W2078408520 sameAs 2078408520 @default.
- W2078408520 citedByCount "2" @default.
- W2078408520 crossrefType "journal-article" @default.
- W2078408520 hasAuthorship W2078408520A5010686731 @default.
- W2078408520 hasAuthorship W2078408520A5032832886 @default.
- W2078408520 hasAuthorship W2078408520A5042574571 @default.
- W2078408520 hasAuthorship W2078408520A5074999356 @default.
- W2078408520 hasBestOaLocation W20784085201 @default.
- W2078408520 hasConcept C154945302 @default.
- W2078408520 hasConcept C15744967 @default.
- W2078408520 hasConcept C169760540 @default.
- W2078408520 hasConcept C2775971261 @default.
- W2078408520 hasConcept C2776502983 @default.
- W2078408520 hasConcept C2779226451 @default.
- W2078408520 hasConcept C2779345533 @default.
- W2078408520 hasConcept C2780238834 @default.
- W2078408520 hasConcept C2780608534 @default.
- W2078408520 hasConcept C2781441883 @default.
- W2078408520 hasConcept C41008148 @default.
- W2078408520 hasConcept C548259974 @default.
- W2078408520 hasConcept C71924100 @default.
- W2078408520 hasConceptScore W2078408520C154945302 @default.
- W2078408520 hasConceptScore W2078408520C15744967 @default.
- W2078408520 hasConceptScore W2078408520C169760540 @default.
- W2078408520 hasConceptScore W2078408520C2775971261 @default.
- W2078408520 hasConceptScore W2078408520C2776502983 @default.
- W2078408520 hasConceptScore W2078408520C2779226451 @default.
- W2078408520 hasConceptScore W2078408520C2779345533 @default.
- W2078408520 hasConceptScore W2078408520C2780238834 @default.
- W2078408520 hasConceptScore W2078408520C2780608534 @default.
- W2078408520 hasConceptScore W2078408520C2781441883 @default.
- W2078408520 hasConceptScore W2078408520C41008148 @default.
- W2078408520 hasConceptScore W2078408520C548259974 @default.
- W2078408520 hasConceptScore W2078408520C71924100 @default.
- W2078408520 hasIssue "8" @default.
- W2078408520 hasLocation W20784085201 @default.
- W2078408520 hasOpenAccess W2078408520 @default.
- W2078408520 hasPrimaryLocation W20784085201 @default.
- W2078408520 hasRelatedWork W1497355957 @default.
- W2078408520 hasRelatedWork W1997316661 @default.
- W2078408520 hasRelatedWork W2023506190 @default.
- W2078408520 hasRelatedWork W2347827516 @default.
- W2078408520 hasRelatedWork W2735976420 @default.
- W2078408520 hasRelatedWork W2945541133 @default.
- W2078408520 hasRelatedWork W2963240718 @default.
- W2078408520 hasRelatedWork W2995957760 @default.
- W2078408520 hasRelatedWork W3029956621 @default.
- W2078408520 hasRelatedWork W4323312401 @default.
- W2078408520 hasVolume "5" @default.
- W2078408520 isParatext "false" @default.
- W2078408520 isRetracted "false" @default.
- W2078408520 magId "2078408520" @default.
- W2078408520 workType "article" @default.