Evidence map›Paper›PMID 26699540›Full record

ArticleBMC medical informatics and decision making2015

Data mining EEG signals in depression for their diagnostic value.

Mahdi Mohammadi, Fadwa Al-Azab, Bijan Raahemi, Gregory Richards, Natalia Jaworska, Dylan Smith, Sara de la Salle, Pierre Blier, Verner Knott

Abstract read
In one paragraph

Article in BMC medical informatics and decision making, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
30citing papers in PubMed, 3 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

30 citing papers in PubMed, 3 syntheses or guidelines pooled it.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Mahdi MohammadiKnowledge Discovery and Data mining Lab (KDD), University of Ottawa, Ottawa, ON, Canada.
Fadwa Al-AzabKnowledge Discovery and Data mining Lab (KDD), University of Ottawa, Ottawa, ON, Canada.
Bijan RaahemiKnowledge Discovery and Data mining Lab (KDD), University of Ottawa, Ottawa, ON, Canada.
Gregory RichardsKnowledge Discovery and Data mining Lab (KDD), University of Ottawa, Ottawa, ON, Canada.
Natalia JaworskaDepartment of Psychiatry, McGill University, Montreal, QC, Canada.
Dylan SmithDepartment of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON, Canada.
Sara de la SalleSchool of Psychology, University of Ottawa, Ottawa, ON, Canada.
Pierre BlierInstitute of Mental Health Research at the Royal Ottawa Mental Health Care Centre, University of Ottawa, 1145 Carling Avenue, Ottawa, ON, K1Z 7 K4, Canada.
Verner KnottInstitute of Mental Health Research at the Royal Ottawa Mental Health Care Centre, University of Ottawa, 1145 Carling Avenue, Ottawa, ON, K1Z 7 K4, Canada. Verner.Knott@theroyal.ca.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundQuantitative electroencephalogram (EEG) is one neuroimaging technique that has been shown to differentiate patients with major depressive disorder (MDD) and non-depressed healthy volunteers (HV) at the group-level, but its diagnostic potential for detecting differences at the individual level has yet to be realized. Quantitative EEGs produce complex data sets derived from digitally analyzed electrical activity at different frequency bands, at multiple electrode locations, and under different vigilance (eyes open vs. closed) states, resulting in potential feature patterns which may be diagnostically useful, but detectable only with advanced mathematical models.

methodsThis paper uses a data mining methodology for classifying EEGs of 53 MDD patients and 43 HVs. This included: (a) pre-processing the data, including cleaning and normalization, applying Linear Discriminant Analysis (LDA) to map the features into a new feature space; and applying Genetic Algorithm (GA) to identify the most significant features; (b) building predictive models using the Decision Tree (DT) algorithm to discover rules and hidden patterns based on the reduced and mapped features; and (c) evaluating the models based on the accuracy and false positive values on the EEG data of MDD and HV participants. Two categories of experiments were performed. The first experiment analyzed each frequency band individually, while the second experiment analyzed the bands together.

resultsApplication of LDA and GA markedly reduced the total number of utilized features by ≥ 50 % and, with all frequency bands analyzed together, the model showed average classification accuracy (MDD vs. HV) of 80 %. The best results from model testing with additional test EEG recordings from 9 MDD patients and 35 HV individuals demonstrated an accuracy of 80 % and showed an average sensitivity of 70 %, a specificity of 76 %, and a positive (PPV) and negative predictive value (NPV) of 74 and 75 %, respectively.

conclusionsThese initial findings suggest that the proposed automated EEG analytical approach could be a useful adjunctive diagnostic approach in clinical practice.

Indexed as

Models, TheoreticalAdultAlgorithmsData MiningElectroencephalographyHumansMajor Depressive DisorderSensitivity and Specificity

Identifiers

PMID26699540
PMCPMC4690290

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.