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Ketamine's Influence on Magnetoencephalography Patterns During a Working Memory Task in Treatment-Resistant
Adam Fijtman1, Mani Yavi1, Abigail Vogeley1
1Section on the Neurobiology and Treatment of Mood Disorders, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, USA.
Bipolar Disorders
|April 3, 2025
Summary
Ketamine effectively treated depression but did not improve working memory in individuals with treatment-resistant depression (TRD). Magnetoencephalography (MEG) showed altered brain activity patterns, suggesting complex neurobiological effects.
Area of Science:
- Neuroscience
- Psychiatry
- Pharmacology
Background:
- Treatment-resistant depression (TRD) presents significant challenges, particularly concerning cognitive deficits.
- Ketamine, a glutamatergic modulator, demonstrates rapid antidepressant effects, prompting investigation into its cognitive impact.
Purpose of the Study:
- To evaluate ketamine's effects on working memory, attention, and concentration in TRD patients.
- To analyze magnetoencephalography (MEG) patterns during a working memory task following ketamine administration.
Main Methods:
- A crossover trial involving 21 TRD patients (14 bipolar disorder, 7 major depressive disorder) receiving ketamine and placebo infusions.
- Assessment of working memory, attention, and concentration using the N-back task.
- Collection of behavioral and MEG data 6-9 hours post-infusion.
Main Results:
- Ketamine significantly improved depressive symptoms but did not enhance cognitive performance.
- MEG data indicated increased gamma power in the parieto-occipital junction and decreased gamma power in the posterior superior temporal sulcus and inferior frontal gyrus post-ketamine.
Conclusions:
- Ketamine's antidepressant effects in TRD were not associated with improvements in working memory, attention, or concentration.
- Observed changes in gamma power suggest underlying neurobiological mechanisms that warrant further investigation.
- Future research should involve larger cohorts, comprehensive cognitive assessments, and repeated ketamine infusions to clarify its cognitive effects in TRD.
