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Cortical Network Dynamics During Source Memory Retrieval: Current Density Imaging With Individual MRI

Authors
Kim, Young YounRoh, Ah YoungNamgoong, YoonJo, Hang JoonLee, Jong-MinKwon, Jun Soo
Issue Date
Jan-2009
Publisher
WILEY
Keywords
source memory retrieval; LORETA; ERPs; old/new effect; statistical parametric mapping; multiple neural systems
Citation
HUMAN BRAIN MAPPING, v.30, no.1, pp.78 - 91
Indexed
SCIE
SCOPUS
Journal Title
HUMAN BRAIN MAPPING
Volume
30
Number
1
Start Page
78
End Page
91
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/177416
DOI
10.1002/hbm.20487
ISSN
1065-9471
Abstract
We investigated the neural correlates of source memory retrieval using low-resolution electromagnetic tromagnetic (LORETA) with 64 channels EEG and individual MRI as a realistic head model. Event-related potentials (ERPs) were recorded while 13 healthy subjects performed the source memory task for the voice of the speaker in spoken words. The source correct condition of old words elicited more positive-going potentials than the correct rejection condition of new words at 400-700 ins post-stimulus and the old/new effects also appeared in the, right anterior region between 1,000 and 1,200 ms. We conducted source reconstruction at mean latencies of 311, 604, 793, and 1,100 ms and used statistical parametric mapping for the statistical analysis. The results of source analysis suggest that the activation of the right inferior parietal region may reflect retrieval of source information. The source elicited by the difference ERPs between the source correct and source incorrect conditions exhibited dynamic change of current density activation in the overall cortices with time during source memory retrieval. These results indicate that multiple neural systems may underlie the ability to recollect context. Hurry Brain Mapp 30:78-91, 2009.
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