. This negative charge inside the cell is created by an imbalance of ions—specifically sodium ( Na+cap N a raised to the positive power ) and potassium ( K+cap K raised to the positive power )—regulated by specialized pumps and channels. The Action Potential: The "All-or-Nothing" Signal
Researchers use several cutting-edge techniques to "listen" to these electrical conversations: Unlocking Brain Function, One Neuron at a Time Electrophysiology of the Neuron
The Spark of Life: Electrophysiology of the Neuron At its core, the brain is an electrical machine. While we often think of thoughts as abstract, they are physically powered by the movement of charged ions across cellular membranes. is the study of these electrical properties, allowing us to understand how cells communicate, how disorders arise, and how the brain processes information . The Resting State: A Battery Ready to Fire While we often think of thoughts as abstract,
: Sodium channels close and potassium channels open, allowing K+cap K raised to the positive power to exit and bringing the voltage back down. ). This triggers an
). This triggers an , a rapid spike in electrical activity that travels down the axon.