Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses

A defining characteristic of Alzheimer’s disease is difficulty in retrieving semantic memories, or memories encoding facts and knowledge. While it has been suggested that this impairment is caused by a degradation of the semantic store, the precise ways in which the semantic store is degraded are no...

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Main Authors: Jeffrey C. Zemla, Joseph L. Austerweil
Format: Article
Language:English
Published: Wiley 2019-01-01
Series:Complexity
Online Access:http://dx.doi.org/10.1155/2019/4203158
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author Jeffrey C. Zemla
Joseph L. Austerweil
author_facet Jeffrey C. Zemla
Joseph L. Austerweil
author_sort Jeffrey C. Zemla
collection DOAJ
description A defining characteristic of Alzheimer’s disease is difficulty in retrieving semantic memories, or memories encoding facts and knowledge. While it has been suggested that this impairment is caused by a degradation of the semantic store, the precise ways in which the semantic store is degraded are not well understood. Using a longitudinal corpus of semantic fluency data (listing of items in a category), we derive semantic network representations of patients with Alzheimer’s disease and of healthy controls. We contrast our network-based approach with analyzing fluency data with the standard method of counting the total number of items and perseverations in fluency data. We find that the networks of Alzheimer’s patients are more connected and that those connections are more randomly distributed than the connections in networks of healthy individuals. These results suggest that the semantic memory impairment of Alzheimer’s patients can be modeled through the inclusion of spurious associations between unrelated concepts in the semantic store. We also find that information from our network analysis of fluency data improves prediction of patient diagnosis compared to traditional measures of the semantic fluency task.
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spelling doaj-art-01ada090bff44aecb72cd5e227b1fa8d2025-08-20T02:01:47ZengWileyComplexity1076-27871099-05262019-01-01201910.1155/2019/42031584203158Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network AnalysesJeffrey C. Zemla0Joseph L. Austerweil1Department of Psychology, University of Wisconsin-Madison, USADepartment of Psychology, University of Wisconsin-Madison, USAA defining characteristic of Alzheimer’s disease is difficulty in retrieving semantic memories, or memories encoding facts and knowledge. While it has been suggested that this impairment is caused by a degradation of the semantic store, the precise ways in which the semantic store is degraded are not well understood. Using a longitudinal corpus of semantic fluency data (listing of items in a category), we derive semantic network representations of patients with Alzheimer’s disease and of healthy controls. We contrast our network-based approach with analyzing fluency data with the standard method of counting the total number of items and perseverations in fluency data. We find that the networks of Alzheimer’s patients are more connected and that those connections are more randomly distributed than the connections in networks of healthy individuals. These results suggest that the semantic memory impairment of Alzheimer’s patients can be modeled through the inclusion of spurious associations between unrelated concepts in the semantic store. We also find that information from our network analysis of fluency data improves prediction of patient diagnosis compared to traditional measures of the semantic fluency task.http://dx.doi.org/10.1155/2019/4203158
spellingShingle Jeffrey C. Zemla
Joseph L. Austerweil
Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses
Complexity
title Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses
title_full Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses
title_fullStr Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses
title_full_unstemmed Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses
title_short Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses
title_sort analyzing knowledge retrieval impairments associated with alzheimer s disease using network analyses
url http://dx.doi.org/10.1155/2019/4203158
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AT josephlausterweil analyzingknowledgeretrievalimpairmentsassociatedwithalzheimersdiseaseusingnetworkanalyses