Abstract
The central nervous system can be considered, on a functional level, as a very sophisticated computational device, transforming an enormous amount of incoming sensory information into commands to the motor system to act upon the world. The required computations take into account past experiences, i.e., memory, and expectations of how the external world behaves. One of the ultimate goals of neuroscience is to understand the computations performed by this system. Of equal importance is the issue of identifying the basic units of information processing. Are single nerve cells the elementary computational units or does information processing occur at subcellular levels?