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Oscillatory and haemodynamic medial temporal responses preceding stimulus onset modulate episodic memory

Emrah Düzel and Sebastian Guderian

in Neuroimaging of Human Memory

Published in print February 2009 | ISBN: 9780199217298
Published online March 2012 | e-ISBN: 9780191696077 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199217298.003.0023
Oscillatory and haemodynamic medial temporal responses preceding stimulus onset modulate episodic memory

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Episodic memory allows us to vividly remember events unfolding around us. The medial temporal lobes (MTL), particularly the hippocampi, are thought to play a key role in both the integration of the various aspects of events during episodic memory formation and the reinstatement of their corresponding representations during episodic retrieval. This chapter extends this traditional stimulus-processing view of MTL function by showing that MTL-activity modulates memory formation not only in response to an event, but already plays a role in establishing optimal encoding states prior to the onset of events. It presents evidence for such prestimulus states using magneto-encephalographic measures of theta (3-8 Hz) oscillations generated in the MTL. These oscillatory properties of MTL function is complemented by functional magnetic resonance imaging (fMRI) data showing hippocampal activation related to the anticipation of novel stimuli and evidence that such anticipation is associated with improved long-term memory formation.

Keywords: episodic memory; media temporal lobes; MTL; hippocampi; memory formation; functional magnetic resonance imaging; fMRI; long-term memory formation

Chapter.  7453 words.  Illustrated.

Subjects: Cognitive Psychology

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