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Neural correlates of top-down letter processing
Liu, Jiangang6; Li, Jun5; Zhang, Hongchuan3; Rieth, Cory A.1; Huber, David E.1; Li, Wu4; Lee, Kang1,2; Tian, Jie4,5
AbstractThis fMRI study investigated top-down letter processing with an illusory letter detection task. Participants responded whether one of a number of different possible letters was present in a very noisy image. After initial training that became increasingly difficult, they continued to detect letters even though the images consisted of pure noise, which eliminated contamination from strong bottom-up input. For illusory letter detection, greater fMRI activation was observed in several cortical regions. These regions included the precuneus, an area generally involved in top-down processing of objects, and the left superior parietal lobule, an area previously identified with the processing of valid letter and word stimuli. In addition, top-down letter detection also activated the left inferior frontal gyrus, an area that may be involved in the integration of general top-down processing and letter-specific bottom-up processing. These findings suggest that these regions may play a significant role in top-down as well as bottom-up processing of letters and words, and are likely to have reciprocal functional connections to more posterior regions in the word and letter processing network. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordWord Processing Letter Processing Top-down Processing Fmri
WOS HeadingsScience & Technology ; Social Sciences ; Life Sciences & Biomedicine
Indexed BySCI ; SSCi
WOS Research AreaBehavioral Sciences ; Neurosciences & Neurology ; Psychology
WOS SubjectBehavioral Sciences ; Neurosciences ; Psychology, Experimental
WOS IDWOS:000274371700033
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Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorTian, Jie
Affiliation1.Univ Calif San Diego, San Diego, CA 92103 USA
2.Univ Toronto, Toronto, ON M5S 1A1, Canada
3.Northwestern Univ, Evanston, IL 60208 USA
4.Chinese Acad Sci, Inst Automat, Beijing 100190, Peoples R China
5.Xidian Univ, Life Sci Res Ctr, Xian 710071, Shaanxi, Peoples R China
6.Beijing Jiaotong Univ, Sch Comp & Informat Technol, Dept Biomed Engn, Beijing 100044, Peoples R China
Corresponding Author AffilicationInstitute of Automation, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu, Jiangang,Li, Jun,Zhang, Hongchuan,et al. Neural correlates of top-down letter processing[J]. NEUROPSYCHOLOGIA,2010,48(2):636-641.
APA Liu, Jiangang.,Li, Jun.,Zhang, Hongchuan.,Rieth, Cory A..,Huber, David E..,...&Tian, Jie.(2010).Neural correlates of top-down letter processing.NEUROPSYCHOLOGIA,48(2),636-641.
MLA Liu, Jiangang,et al."Neural correlates of top-down letter processing".NEUROPSYCHOLOGIA 48.2(2010):636-641.
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