Abstract
This paper analyzes the scalp electroencephalogram (EEG) recorded from 14 human subjects with pFC lesions and 20 healthy controls while performing lateral visuospatial working memory tasks to identify the directional brain networks responsible for memory encoding. First, we show that effective connectivity features using directed information (DI) are more accurate and robust than the functional connectivity measure of correlation coefficients in classifying the memory encoding stage from the pretrial phase, with a mean accuracy of 99.36%. Second, we identify the functional segregation of memory encoding to a much smaller sub-network by showing that the top 2.5% of the observed DI features can distinguish memory encoding from the pretrial phase with a mean accuracy of 93.1%. Finally, using graph features, we reveal the increased significance of frontocentral, centroparietal, and temporal regions in memory encoding for subjects with pFC lesions and reduced information flow in the prefrontal, frontal and parietooccipital areas when compared to healthy control.
Original language | English (US) |
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Title of host publication | 56th Asilomar Conference on Signals, Systems and Computers, ACSSC 2022 |
Editors | Michael B. Matthews |
Publisher | IEEE Computer Society |
Pages | 1311-1315 |
Number of pages | 5 |
ISBN (Electronic) | 9781665459068 |
DOIs | |
State | Published - 2022 |
Event | 56th Asilomar Conference on Signals, Systems and Computers, ACSSC 2022 - Virtual, Online, United States Duration: Oct 31 2022 → Nov 2 2022 |
Publication series
Name | Conference Record - Asilomar Conference on Signals, Systems and Computers |
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Volume | 2022-October |
ISSN (Print) | 1058-6393 |
Conference
Conference | 56th Asilomar Conference on Signals, Systems and Computers, ACSSC 2022 |
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Country/Territory | United States |
City | Virtual, Online |
Period | 10/31/22 → 11/2/22 |
Bibliographical note
Funding Information:This paper was supported in part by the National Science Foundation under grant number CCF-1954749.
Publisher Copyright:
© 2022 IEEE.
Keywords
- betweenness centrality
- directed information (DI)
- effective connectivity
- prefrontal cortex (pFC)
- working memory task