## Overview

In this portfolio we describe the threshold logic unit (TLU) as presented by McCulloch and Pitts (1943) as an example of a simple artificial neuron. We name and describe each of the components and their biological analogies. We describe how the TLU as a whole functions, and how networks of TLUs function. We conclude by comparing the function of TLUs to its contemporaries and successors.

## Learning Outcomes

After reading this portfolio, we expect the reader to be able to:
- List the component parts of a simple artificial neuron.
- Draw a labelled diagram of a simple artificial neuron.
- Describe the function and operation of:
- The input lines.
- The weights.
- The summation unit.
- The threshold unit.
- The output lines.

- Describe the function and operation of the whole structure.
- Describe how a neuron fits into a network.

Next: The Neuron.