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Related Experiment Video

Updated: Apr 26, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
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Xu Lei, Yulin Wang, Hong Yuan

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    Summary
    This summary is machine-generated.

    Alcohol increases theta brainwave activity, particularly in the frontal cortex. This heightened activity correlates with stronger anti-correlation between the dorsal attention network (DAN) and default mode network (DMN).

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    Area of Science:

    • Neuroscience
    • Cognitive Neuroscience
    • Neuroimaging

    Background:

    • Resting-state functional magnetic resonance imaging (fMRI) reveals large-scale brain networks, including the dorsal attention network (DAN) and default mode network (DMN).
    • A known interaction is the anti-correlation between DAN and DMN, where one network's activation corresponds to the other's deactivation.
    • Alcohol affects brain network activity and electroencephalography (EEG) oscillations, but its impact on EEG power and DAN-DMN interactions is not well understood.

    Purpose of the Study:

    • To investigate the effects of alcohol on band-limited EEG power during resting state.
    • To explore the relationship between alcohol-induced EEG changes and functional interactions between the DAN and DMN.
    • To assess the utility of simultaneous EEG-fMRI in studying drug effects on the central nervous system.

    Main Methods:

    • Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were used.
    • Participants underwent resting-state scans before and after alcohol or placebo administration.
    • EEG power in different frequency bands and functional connectivity between brain networks were analyzed.

    Main Results:

    • Alcohol administration led to increased theta frequency band (4-8 Hz) EEG power, especially over the frontal cortex, compared to placebo.
    • Increased frontal theta EEG power was associated with enhanced anti-correlation between the DAN and the frontal component of the DMN.
    • Higher EEG theta power and DAN-DMN anti-correlation were observed in subjects reporting euphoria, potentially linked to reduced prefrontal cortex inhibition.

    Conclusions:

    • Slow brain rhythms, specifically frontal theta activity, play a role in modulating dynamic functional interactions between large-scale brain networks.
    • Alcohol administration alters brain network dynamics, evidenced by changes in EEG power and functional connectivity.
    • Simultaneous EEG-fMRI is a valuable tool for researching the neurobiological effects of drugs on the central nervous system.