Brain activity

Brain activity refers to the collective electrochemical processes within the central nervous system, characterized by the synchronized firing of neurons and the transmission of signals across synaptic junctions (NIH, 2023). It is not a discrete molecular target, such as a single receptor or enzyme, but rather a high-level physiological state or biological process resulting from the coordinated interaction of billions of cells and diverse molecular components (StatPearls, 2023). In the context of drug discovery, 'brain activity' is typically viewed as a functional readout or a therapeutic endpoint rather than the primary target itself. Most neuroactive pharmaceuticals exert their effects by binding to specific proteins—such as the Gamma-aminobutyric acid (GABA) receptors or voltage-gated sodium channels—to modulate this overarching activity. Pathological alterations in brain activity are hallmark features of conditions like epilepsy, where excessive synchronization leads to seizures, or Alzheimer’s disease, where activity levels decline due to neurodegeneration (Purves et al., Neuroscience, 2018). Monitoring brain activity through techniques like EEG or fMRI is essential for diagnosing neurological disorders and assessing the pharmacodynamic effects of drugs in development. Therefore, while brain activity is a critical focus of biomedical research, it remains a macroscopic physiological phenomenon rather than a singular therapeutic target.

Other names

Neuronal activityNeural activityCerebral activityNeurotransmissionElectrophysiological activity

Modulation of global or regional neuronal excitability through interaction with specific molecular targets such as ion channels, G protein-coupled receptors, and neurotransmitter transporters.