> See also: > - [[Brain Activity]] # The Brain Neuron In terms of brain activity, **action potential** is when the membrane voltage of a neuron gets positive enough that a wave of positive ions moves through the neuron. --- ## Neurons **Dendrite** - a **Axon** - a ## Brain Activity Both EEG and MEG are techniques used to measure activity within the brain: --- **Electroencephalography (EEG)** measures the electrical activity of the brain by detecting the tiny electrical currents produced by the brain's neurons - _Measured by event-related potential (ERPs)_ - Generated by differences in concentration of charge (separated by membrane of neuron cells) Imagine water flowing through a pipe, it will naturally flow from the higher pressure to the lower pressure location. Electrical charges work similarly in that --- **Magnetoencephalography (MEG)** measures the magnetic fields produced by the brain's electrical activity - _Measured by event-related fields (ERFs)_