Literaturnachweis - Detailanzeige
Autor/inn/en | Bitan, Tali; Cheon, Jimmy; Lu, Dong; Burman, Douglas D.; Booth, James R. |
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Titel | Developmental Increase in Top-Down and Bottom-Up Processing in a Phonological Task: An Effective Connectivity, fMRI Study |
Quelle | In: Journal of Cognitive Neuroscience, 21 (2009) 6, S.1135-1145 (11 Seiten)
PDF als Volltext |
Sprache | englisch |
Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
ISSN | 0898-929X |
DOI | 10.1162/jocn.2009.21065 |
Schlagwörter | Brain Hemisphere Functions; Phonology; Rhyme; Children; Age Differences; Written Language; Language Processing |
Abstract | We examined age-related changes in the interactions among brain regions in children performing rhyming judgments on visually presented words. The difficulty of the task was manipulated by including a conflict between task-relevant (phonological) information and task-irrelevant (orthographic) information. The conflicting conditions included pairs of words that rhyme despite having different spelling patterns ("jazz-has"), or words that do not rhyme despite having similar spelling patterns ("pint-mint"). These were contrasted with nonconflicting pairs that have similar orthography and phonology ("dime-lime") or different orthography and phonology ("press-list"). Using fMRI, we examined effective connectivity among five left hemisphere regions of interest: fusiform gyrus (FG), inferior frontal gyrus (IFG), intraparietal sulcus (IPS), lateral temporal cortex (LTC), and medial frontal gyrus (MeFG). Age-related increases were observed in the influence of the IFG and FG on the LTC, but only in conflicting conditions. These results reflect a developmental increase in the convergence of bottom-up and top-down information on the LTC. In older children, top-down control process may selectively enhance the sensitivity of the LTC to bottom-up information from the FG. This may be evident especially in situations that require selective enhancement of task-relevant versus task-irrelevant information. Altogether these results provide a direct evidence for a developmental increase in top-down control processes in language processing. The developmental increase in bottom-up processing may be secondary to the enhancement of top-down processes. (As Provided). |
Anmerkungen | MIT Press. Circulation Department, Five Cambridge Center, Cambridge, MA 02142. Tel: 617-253-2889; Fax: 617-577-1545; e-mail: journals-orders@mit.edu; Web site: http://www.mitpressjournals.org/loi/jocn |
Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
Update | 2017/4/10 |