Nonlinear analysis of EEG complexity in episode and remission phase of recurrent depression
M Čukić, M Stokić, S Radenković… - … journal of methods …, 2020 - Wiley Online Library
International journal of methods in psychiatric research, 2020•Wiley Online Library
Objectives Biomarkers of major depressive disorder (MDD), its phases and forms have long
been sought. Objectives were to examine whether the complexity of EEG activity, measured
by Higuchi's fractal dimension (HFD) and sample entropy (SampEn), differs between healthy
subjects, patients in remission, and in episode phase of the recurrent depression and
whether the changes are differentially distributed between hemispheres and cortical
regions. Methods Resting state EEG with eyes closed was recorded from 22 patients …
been sought. Objectives were to examine whether the complexity of EEG activity, measured
by Higuchi's fractal dimension (HFD) and sample entropy (SampEn), differs between healthy
subjects, patients in remission, and in episode phase of the recurrent depression and
whether the changes are differentially distributed between hemispheres and cortical
regions. Methods Resting state EEG with eyes closed was recorded from 22 patients …
Objectives
Biomarkers of major depressive disorder (MDD), its phases and forms have long been sought. Objectives were to examine whether the complexity of EEG activity, measured by Higuchi's fractal dimension (HFD) and sample entropy (SampEn), differs between healthy subjects, patients in remission, and in episode phase of the recurrent depression and whether the changes are differentially distributed between hemispheres and cortical regions.
Methods
Resting state EEG with eyes closed was recorded from 22 patients suffering from recurrent depression (11 in remission, 11 in the episode), and 20 age and sex‐matched healthy control subjects. Artifact‐free EEG epochs were analyzed by in‐house developed programs running HFD and SampEn algorithms.
Results
Depressed patients had higher HFD and SampEn complexity compared to healthy subjects. The complexity was higher in patients who were in remission than in those in the acute episode. Altered complexity was present in the frontal and centro‐parietal regions when compared to control group. The complexity in frontal and parietal regions differed between the two phases of depressive disorder.
Conclusions
Complexity measures of EEG distinguish between the healthy controls, patients in remission and episode. Further studies are needed to establish whether these measures carry a potential to aid clinically relevant decisions about depression.
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