A neural net was used similarly to a computer. However, it could imitate human thought processes.

A neural net ran the systems of Project Eden. There were also neural nets in the Project's starsuits. (PROSE: Lucifer Rising)

The Mondasian Cybermen were part of a neural net. The Twelfth Doctor asked a newly converted Cyberman to find out where Bill Potts was, unaware until a few moments later the Cyberman was Bill. (TV: World Enough and Time)