Oasis, online abstract submission and invitation system - program planner
Oasis, Online Abstract Submission and Invitation System - Program Planner
Print this Page for Your RecordsClose Window Program#/Poster#: 667.1 Title:
Subsequent memory dependent EEG theta correlates with hippocampal BOLD response inhuman
Location: Presentation Start/End Time: Authors: *N. SATO1, T. OZAKI1, Y. SOMEYA2, K. ANAMI2, S. OGAWA2, H. MIZUHARA1,3, Y. YAMAGUCHI1; 1Lab.Dynamics Emergent Intelligence, RIKEN Brain Sci. Inst., Wako-shi, Japan; 2Ogawa Lab. Brain Function Res., Hamano Life Sci. Res. Fndn., Tokyo, Japan; 3Dep of Intelligence Sci. and Tech. Grad Sch. of Informatics, Kyoto Univ., Kyoto, Japan
Patient studies of the hippocampal damage clearly demonstrated that the hippocampus is associated with object- place associative memory. It suggests the importance of the hippocampus in storing multiple information contents in the environment, while its neural mechanism is an open question. The authors have proposed a cortico-hippocampal network model of the memory task (Sato and Yamaguchi, Hippocampus 2005). In this model, a hippocampal neural dynamics, "theta phase precession", observed in rat hippocampus was applied to cortico-hippocampal system with a randomly saccadic visual input sequence. The computational experiments demonstrated that theta phase precession contributes to the formation of multiple object-place memories in the CA3 network consisting of spatial scale-related asymmetric connections among object and scene units. Human scalp EEG study (Sato and Yamaguchi, NeuroReport, 2007) demonstrated that EEG theta power and coherence during encoding increase in relation to the subsequently successful recall, while it remains unclear whether the hippocampus is associated with such a scalp EEG theta or not. In this paper, we directly evaluated the relation between the scalp EEG theta and the hippocampal activity by using a simultaneous EEG-functional magnetic resonance imaging (fMRI) recording. Eight participants completed an object- place memory task consisting of a 10-sec encoding of four object-place associations and a recall with an 18-sec delay. BOLD signals were acquired with a 3-T Siemens Allegra MRI scanner during performing the task and 64-ch scalp EEG were simultaneously recorded. In the fMRI data analysis, hippocampal region of interest (ROIs) were individually defined and used for the subsequent memory analysis for successful and failed trials. In the result, by removing large artifacts, we successfully detected the EEG theta power increase in relation to the subsequently successful recall. Moreover a cross-correlation analysis demonstrates that the EEG theta power at the central region is significantly correlated to the hippocampal blood oxygenation level dependent (BOLD) response. In conclusion, these results support the hypotheses that hippocampal theta dynamics, as observed in the rat hippocampus, facilitates the memory encoding of what and where in human episodic memory. Disclosures: N. Sato , None; T. Ozaki, None; Y. Someya, None; K. Anami, None; S. Ogawa, None; H. Mizuhara, None; Y. Yamaguchi, None.
[Authors]. [Abstract Title]. Program No. XXX.XX. 2007 Neuroscience Meeting Planner. San
Diego, CA: Society for Neuroscience, 2007. Online.
2007 Copyright by the Society for Neuroscience all rights reserved. Permission to republish any
abstract or part of any abstract in any form must be obtained in writing by SfN office prior to
OASIS - Online Abstract Submission and Invitation System™ 1996-2007, Coe-Truman Technologies, Inc.
SOUTENANCES DES MEMOIRES DE RECHERCHE DE LITTERATURE Vendredi 22 juin 2012 Sous la Présidence de M. Robert MESLÉ Ostéopathe D.O. Chercheur Open Rome (Réseaux d'Observation des Maladies et des Epidémies) Assistant à la Faculté des Sciences de la Motricité de l'ULB (Bruxelles) Directeur de la publication de La Revue de l'Ostéopathie François DELCOURT - Camille BE
MIDDLEBURY COLLEGE ECONOMICS DISCUSSION PAPER NO. 07-14 TEE TESTS: PLAYING WITH TIGER TEE TESTS: PLAYING WITH TIGER Tiger Woods is arguably the best golfer ever on the Professional Golf Association (PGA) Tour. In 2006, he was first among money leaders. In that year, he also ranked 1st in scoring average, 1st in birdie average, 1st in greens in regulation, and 1st among par breakers.