AI requires 3 things

(1) Neuron Model
(2) Topology
(3) Complexity

The model of an isolated neuron is everything. There is no supervision. This is, because supervising or logging the work of 100 billion neurons would be more complex than 100 billion neurons. Then you need topology and then (more and enough) complexity.

Model the neuron in the scope of seconds and hours.
Model short time spontaneous firing.
Model awakeness and sleep.
Model dreaming (long time spontaneous firing caused by stimulation hours ago).