Donald Hebb Hebbian learning unsupervised learning long term potentiation Turing's B-type machines
In the late 1940s psychologist Donald Hebb  created a hypothesis of learning based on the mechanism of neural plasticity that is now known as Hebbian learning. Hebbian learning is considered to be a 'typical' unsupervised learning rule and its later variants were early models for long term potentiation. These ideas started being applied to computational models in 1948 with Turing's B-type machines.
