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01-08-2014 | Research Report

Modification of EEG power spectra and EEG connectivity in autobiographical memory: a sLORETA study

Authors: Claudio Imperatori, Riccardo Brunetti, Benedetto Farina, Anna Maria Speranza, Anna Losurdo, Elisa Testani, Anna Contardi, Giacomo Della Marca

Published in: Cognitive Processing | Issue 3/2014

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Abstract

The aim of the present study was to explore the modifications of scalp EEG power spectra and EEG connectivity during the autobiographical memory test (AM-T) and during the retrieval of an autobiographical event (the high school final examination, Task 2). Seventeen healthy volunteers were enrolled (9 women and 8 men, mean age 23.4 ± 2.8 years, range 19–30). EEG was recorded at baseline and while performing the autobiographical memory (AM) tasks, by means of 19 surface electrodes and a nasopharyngeal electrode. EEG analysis was conducted by means of the standardized LOw Resolution Electric Tomography (sLORETA) software. Power spectra and lagged EEG coherence were compared between EEG acquired during the memory tasks and baseline recording. The frequency bands considered were as follows: delta (0.5–4 Hz); theta (4.5–7.5 Hz); alpha (8–12.5 Hz); beta1 (13–17.5 Hz); beta2 (18–30 Hz); gamma (30.5–60 Hz). During AM-T, we observed a significant delta power increase in left frontal and midline cortices (T = 3.554; p < 0.05) and increased EEG connectivity in delta band in prefrontal, temporal, parietal, and occipital areas, and for gamma bands in the left temporo-parietal regions (T = 4.154; p < 0.05). In Task 2, we measured an increased power in the gamma band located in the left posterior midline areas (T = 3.960; p < 0.05) and a significant increase in delta band connectivity in the prefrontal, temporal, parietal, and occipital areas, and in the gamma band involving right temporo-parietal areas (T = 4.579; p < 0.05). These results indicate that AM retrieval engages in a complex network which is mediated by both low- (delta) and high-frequency (gamma) EEG bands.

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Title: Modification of EEG power spectra and EEG connectivity in autobiographical memory: a sLORETA study
Authors: Claudio Imperatori
Riccardo Brunetti
Benedetto Farina
Anna Maria Speranza
Anna Losurdo
Elisa Testani
Anna Contardi
Giacomo Della Marca
Publication date: 01-08-2014
Publisher: Springer Berlin Heidelberg
Published in: Cognitive Processing / Issue 3/2014
Print ISSN: 1612-4782
Electronic ISSN: 1612-4790
DOI: https://doi.org/10.1007/s10339-014-0605-5

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