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GABAergic modulation of visual gamma and alpha oscillations and its consequences for working memory performance
Diego Lozano-Soldevilla1, Niels ter Huurne2, Roshan Cools2
1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, P.O. Box 9104, 6500 HE Nijmegen, the Netherlands.
Current Biology : CB
|December 3, 2014
Summary
This study shows that lorazepam (a GABAergic drug) affects human brain oscillations (gamma and alpha power) during a working memory task, linking these neural dynamics to performance changes and validating animal models.
Area of Science:
- Neuroscience
- Pharmacology
- Cognitive Science
Background:
- Neuronal oscillations are fundamental to brain function, with GABAergic interneurons crucial for synchronizing neural populations.
- Mechanisms of neuronal oscillations identified in rodents and computational models are being investigated for their applicability to human brain activity.
- Understanding human brain oscillations is key to deciphering cognitive processes and the effects of neuromodulatory agents.
Purpose of the Study:
- To investigate whether core mechanisms of neuronal oscillations observed in animal models apply to human brain function.
- To examine the effects of lorazepam, a GABAergic drug, on human brain oscillations during a visuospatial working memory task.
- To link drug-induced modulations in neural activity to behavioral performance in humans.
Main Methods:
- Magnetoencephalography (MEG) was used to record ongoing brain activity in healthy human subjects.
- A double-blind, placebo-controlled study design was employed, administering varying doses of lorazepam (0.5 mg and 1.5 mg).
- Participants performed a demanding visuospatial working memory task to assess cognitive function under pharmacological intervention.
Main Results:
- Occipital gamma power increased with lorazepam dosage, while its frequency decreased, consistent with rodent models.
- Gamma power increases in the visual cortex correlated with decreased working memory performance, but sensorimotor activity remained unaffected.
- Occipital alpha power decreased with lorazepam dosage, particularly in task-irrelevant visual regions, predicting performance impairment and suggesting a role in functional inhibition.
Conclusions:
- GABAergic interneurons are critical for generating gamma and alpha oscillations in the human occipital cortex.
- Drug-induced modulations in neural power, specifically gamma and alpha oscillations, predict working memory performance.
- These findings support the translation of animal models of neuronal dynamics to understand human cognitive function and behavior.
