Originally posted by alkatran
Did you know a neuron either fires or it doesn't? That means there is no "maybe" at the most basic scale of humans OR computers. There is a cut-off point between true and false.
This is definitely not true for biological neurons. Neurons can fire at different intensities, and they have thresholds for firing on differing levels of input or different combinations of input.

As yrwyddfa pointed out, nodes in a neural net most often use values between 0 and 1. This is due to the concept that neural nets are probability-based difference engines, as are some models of the human brain