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Updated: Jan 11, 2026

Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
Published on: August 30, 2011
CA2/3-dependent stability of frontal mnemonic representations predict episodic deficits in human amnesia
Thomas D Miller1, Alice L Hickling2, Yan I Wu2
1Department of Imaging Neuroscience, University College London, London, UK; UCL Queen Square Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London, UK.
None:
The hippocampus reconstructs past experiences by integrating sensory, perceptual, and conceptual information across a cortico-hippocampal autobiographical memory network. Here, in 18 human participants with amnesia, we decode the effects of bilateral focal hippocampal damage on distinct autobiographical representations using representational dissimilarity matrices (RDMs). Hippocampal pathology results in impaired generalized episodic memory retrieval RDM model fit in the left angular gyrus and in reduced distinct episodic memory RDM model fit in the right inferior frontal gyrus (rIFG), while right angular gyrus (rANG) and right orbitofrontal cortex (rOFC) fall below multiple correction thresholds. Trial-by-trial voxel-representational stability is reduced in the rANG, rIFG, and rOFC. The RDM model fits and mnemonic stability are predicted by total CA2/3 volumes. Trial-by-trial retrieval stability within the rOFC and rIFG predicts episodic memory performance, providing a direct neural correlation between hippocampal dysfunction, altered mnemonic representations, and amnesia.
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