How do the electronics meet animal brains?

All biologic neural networks (brains) rely on the transmission of electrons (essentially an electric current) between synapses. There are currently experiments underway to determine the effects of various amounts of stimulation on various areas to better map the brain (both in animals and in people) and understand how thought processes work. This can be done through direct stimulation by an electrode or electronic devices planted in the brain itself that can then be activated remotely.