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Epilepsy and Seizures: Overview01:24

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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
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Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
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γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
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Rhythmic Network Modulation to Thalamocortical Couplings in Epilepsy.

Yun Qin1, Nan Zhang1, Yan Chen1

  • 1The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Lab for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China.

International Journal of Neural Systems
|April 21, 2020
PubMed
Summary

This study reveals how brain rhythms modulate thalamocortical connectivity in epilepsy. Specific rhythms influence thalamus-network couplings, offering insights into generalized and focal epilepsy mechanisms.

Keywords:
Thalamocortical couplingcorticocortical connectivityepilepsymodulationrhythmic scalp network

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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Computational Neuroscience

Background:

  • Thalamus and cortex interactions generate brain oscillations, but their functional role in thalamocortical couplings remains unclear.
  • Understanding rhythmic modulation of thalamocortical networks is crucial for epilepsy research.

Purpose of the Study:

  • To investigate the modulatory contribution of rhythmic scalp networks to thalamo-frontal couplings in juvenile myoclonic epilepsy (JME) and frontal lobe epilepsy (FLE).
  • To examine the relationship between corticocortical connectivity and rhythm-dependent thalamocortical coupling.

Main Methods:

  • Constructed time-varying rhythmic networks using directed transfer functions from EEG data.
  • Applied rhythmic networks as modulators in fMRI-based thalamocortical functional coupling analyses.
  • Examined associations between corticocortical connectivity and rhythm-dependent thalamocortical coupling.

Main Results:

  • Thalamocortical couplings modulated by EEG networks exhibit frequency-dependent characteristics.
  • In JME, alpha band strongly modulated thalamus-sensorimotor network (SMN) and thalamus-default mode network (DMN) couplings, with thalamus-SMN couplings linked to SMN corticocortical connectivity.
  • In FLE, altered theta- and beta-dependent thalamus-frontoparietal network (FPN) couplings were observed, with reduced theta-dependent couplings associated with decreased FPN corticocortical connectivity.

Conclusions:

  • Proposed interactive links between rhythmic modulation and thalamocortical coupling in epilepsy.
  • Highlighted the critical role of SMN and FPN in subcortical-cortical circuits.
  • Suggests potential implications for epilepsy interventions targeting these circuits.