FMRI congruous word repetition effects reflect memory variability in normal elderly

John M. Olichney*, Jason R. Taylor, Dieter G. Hillert, Shiao hui Chan, David P. Salmon, James Gatherwright, Vicente J. Iragui, Marta Kutas

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

13 引文 斯高帕斯(Scopus)

摘要

Neural circuits mediating repetition effect for semantically congruous words on functional MRI were investigated in seventeen normal elderly (mean age=70). Participants determined if written words were semantically congruent (50% probability) with spoken statements. Subsequent cued-recall revealed robust explicit memory only for congruous items (83% versus 8% for incongruous). Event-related BOLD responses to New > Old congruous words were found in the left > right cingulate and fusiform gyri, left parahippocampal cortex, middle and inferior frontal gyri (IFG). A group with above-median subsequent recall had markedly more widespread BOLD responses than a Low-Recall subgroup, with larger responses in the left medial temporal lobe (LMTL), IFG, and bilateral cingulate gyri. The magnitude of LMTL activation (New-Old) correlated with subsequent cued-recall, while the spatial extent of LMTL activation (New > Old) correlated with recall and recognition. Both magnitude and spatial extent of left fusiform activation correlated with subsequent recall/recognition. A neural circuit of left-hemisphere brain regions, many identified as P600 generators by invasive electrophysiological studies, was activated by New > Old congruous words, likely mediating successful verbal encoding.

原文英語
頁(從 - 到)1975-1990
頁數16
期刊Neurobiology of Aging
31
發行號11
DOIs
出版狀態已發佈 - 2010 11月
對外發佈

ASJC Scopus subject areas

  • 神經科學 (全部)
  • 老化
  • 神經病學(臨床)
  • 發展生物學
  • 老年病學和老年學

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