The animation shows the activation of a corticospinal axon with transcranial electrical stimulation. The time span of the animation is 600 microseconds.
Stimulus is illustrated with the red and blue color of the electrodes.
The axon is activated directly at a deep bend at a location corresponding to the fiber entering the midbrain. The propagating action potential initiated nearer surface is blocked due collision. Modeling direct activation of corticospinal axons using transcranial electrical stimulation.