Cortical excitability (CE)

Cortical excitability refers to the propensity or responsiveness of the cerebral cortex to generate electrical activity—specifically action potentials—in response to incoming stimuli. It is a fundamental neurophysiological property reflecting the balance between excitation and inhibition within local neural circuits. Cortical excitability is not itself a molecule, receptor, enzyme, transporter, or other canonical drug target but rather an emergent property determined by the function and modulation of various ion channels (such as voltage-gated sodium [NaV], potassium [KV], calcium [CaV] channels), neurotransmitter receptors (e.g., AMPA/NMDA for glutamate; GABA-A/B for inhibitory signaling), neuromodulators acting via GPCRs at axonal compartments and synapses, and intrinsic cellular properties like membrane potential regulation. Changes in cortical excitability are implicated in both normal processes—such as learning/memory via synaptic plasticity—and pathological conditions including epilepsy (where hyperexcitability leads to seizures), migraine aura phenomena, age-related cognitive decline/dementia risk states, psychiatric disorders with altered excitation/inhibition balance, among others. While cortical excitability can be measured using techniques like transcranial magnetic stimulation (TMS) with EMG readouts or paired-pulse paradigms, it does not correspond to any single molecular entity that could serve as a direct therapeutic target. Instead, pharmacological agents that modulate underlying molecular components—such as antiepileptics targeting NaV/KV/CaV channels or GABAergic transmission—can indirectly influence cortical excitability.

Other names

Cortical excitabilityCE

Not applicable as this is not a single molecule or receptor; mechanisms involve modulation of ion channels such as voltage-gated sodium, potassium, calcium channels, and GABAergic signaling.