This activity takes an experimental approach to introduce the notion of the threshold of excitation in nerve cells via electrical stimulation of 5 µA, 10 µA, 20 µA, 40 µA and 80 µA.
One notes in passing the way in which the information is encoded:
Beyond the threshold of excitation, the nerve message is a signal that takes the form of a train of action potentials, the frequency of which is proportional to the intensity of the stimulation.
Click on « Start the Experiment », then select an excitation intensity.
Roll over the oscilloscope screens to obtain values.