person A researcher at the University of Helsinki who has

been studying neural networks for many years with the idea

of modelling as closely as possible the behaviour of

biological systems. His name is commonly associated with a

particular kind of neural network in which there are only two

kinds of neurons (see McCulloch-Pitts), input and others.

All the input neurons are connected to all others and the

others are connected only to their other nearest neighbors.

The training algorithm is a relatively simple one based on

the geometric layout of the neurons, and makes use of

simulated annealing.