: Voltage-gated sodium channels snap open, allowing Na+cap N a raised to the positive power to flood into the cell, making it more positive.

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

A neuron at rest is like a charged battery. It maintains a , typically around

This process is "all-or-nothing"—the signal doesn't get "stronger" with more stimulus; instead, the neuron fires more frequently . How We Study the Brain's Electricity

Researchers use several cutting-edge techniques to "listen" to these electrical conversations: Unlocking Brain Function, One Neuron at a Time

: The voltage briefly dips below the resting level before stabilizing.

When a neuron receives enough stimulation, it reaches a critical "threshold" (around

: Sodium channels close and potassium channels open, allowing K+cap K raised to the positive power to exit and bringing the voltage back down.