S-Space College of Medicine/School of Medicine (의과대학/대학원) Psychiatry (정신과학전공) Journal Papers (저널논문_정신과학전공)
Cortical Network Dynamics During Source Memory Retrieval: Current Density Imaging With Individual MRI
- Kim, Young Youn; Roh, Ah Young; Namgoong, Yoon; Jo, Hang Joon; Kwon, Jun Soo; Lee, Jong-Min
- Issue Date
- HUMAN BRAIN MAPPING; Vol.30(1); 78-91
- source memory retrieval; statistical parametric mapping; multiple neural systems; old/new effect; LORETA; ERPs
- 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.
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