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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
11:01

Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

Published on: August 30, 2011

Memory for action sequences in semantic dementia.

Anna-Lynne R Adlam1, Michelle de Haan, John R Hodges

  • 1Centre for Clinical Neuropsychology Research, School of Psychology, College of Life and Environmental Sciences, University of Exeter, UK. a.r.adlam@exeter.ac.uk

Neuropsychologia
|March 19, 2013
PubMed
Summary
This summary is machine-generated.

Individuals with semantic dementia (SD) demonstrate nonverbal episodic memory over 24 hours, even when semantic memory is impaired. Their recall is less influenced by sequence structure compared to healthy controls.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Semantic dementia (SD) involves progressive degeneration of semantic memory.
  • Episodic memory is typically considered relatively preserved in SD.

Purpose of the Study:

  • To assess the nonverbal, incidental, episodic memory profile in SD.
  • Investigate recall of novel action sequences after a 24-hour delay using deferred imitation.

Main Methods:

  • Compared 6 individuals with SD to 10 healthy controls.
  • Used deferred imitation to test recall of novel, three-step action sequences (causal vs. arbitrary).
  • Assessed memory for actions and sequence order after a 24-hour delay.

Main Results:

  • Both groups recalled arbitrary sequences better than baseline after 24 hours.
  • Only controls showed significant memory for the order of causal sequences.
  • Controls, unlike SD patients, showed a recall advantage for causal over arbitrary sequences.

Conclusions:

  • Individuals with SD exhibit some nonverbal episodic memory after a 24-hour delay.
  • New anterograde memory can form to some extent without significant semantic memory support in SD.
  • Semantic knowledge aids episodic memory recall in healthy individuals but not in SD.