That channel is composed of samarium nickelate (SmNiO3, or SNO) rather than the field effect transistor's doped silicon.
[3] A synaptic transistor has a traditional immediate response whose amount of current that passes between the source and drain contacts varies with voltage applied to the gate electrode.
[3] The input and output of the synaptic transistor are continuous analog values, rather than digital on-off signals.
While the physical structure of the device has the potential to learn from history, it contains no way to bias the transistor to control the memory effect.
An external supervisory circuit converts the time delay between input and output into a voltage applied to the ionic liquid that either drives ions into the SNO or removes them.