Key result
Major Depressive Disorder was characterized by a lack of left dominance during the resting state and left hypoactivity during the task baseline and subsequent decision-making process.
Why the study?
Depression is associated with impaired decision-making and resting frontal brain asymmetry, but brain asymmetry during decision-making under negative and positive feedback conditions remained to be investigated.
Does brain asymmetry differ between patients with Major Depressive Disorder and healthy controls during a decision-making task?
Case-Control (n=120)
Does brain asymmetry differ between patients with Major Depressive Disorder and healthy controls during a decision-making task?
MDD is associated with altered brain asymmetry, specifically left hypoactivity, during decision-making tasks, highlighting potential EEG biomarkers for depression.
Answers are grounded in this paper and cite their sources.
Brain asymmetry during MDD decision-making feedback needs replication; leaves open valence-specific lateralization markers for targeted interventions.
Depressed patients are characterized by hypoactivity of the left and hyperactivity of the right frontal areas during the resting state. Depression is also associated with impaired decision-making, which reflects multiple cognitive, affective, and attentional processes, some of which may be lateralized. The aim of this study was to investigate brain asymmetry during a decision-making task performed in negative and positive feedback conditions in patients with Major Depressive Disorder (MDD) in comparison to healthy control participants. The electroencephalogram (EEG) was recorded from 60 MDD patients and 60 healthy participants while performing a multi-stage decision-making task. Frontal, central, and parietal alpha asymmetry were analyzed with EEGlab/ERPlab software. Evoked potential responses (ERPs) showed general lateralization suggestive of an initial right dominance developing into a more complex pattern of asymmetry across different scalp areas as information was processed. The MDD group showed impaired mood prior to performance, and decreased confidence during performance in comparison to the control group. The resting state frontal alpha asymmetry showed lateralization in the healthy group only. Task-induced alpha power and ERP P100 and P300 amplitudes were more informative biomarkers of depression during decision making. Asymmetry coefficients based on task alpha power and ERP amplitudes showed consistency in the dynamical changes during the decision-making stages. Depression was characterized by a lack of left dominance during the resting state and left hypoactivity during the task baseline and subsequent decision-making process. Findings add to understanding of the functional significance of lateralized brain processes in depression.
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Kustubayeva et al. (2020) conducted a case-control in Major Depressive Disorder (n=120). Major Depressive Disorder vs. Healthy controls was evaluated on Brain asymmetry (alpha power and ERP amplitudes) during a decision-making task. Major Depressive Disorder was characterized by a lack of left dominance during the resting state and left hypoactivity during the task baseline and subsequent decision-making process.
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