Even when you are asleep, neurons in your brain are busy sending a flurry of electrical signals from one region to the next, consolidating memories and information from the previous day. (masteringdiabetes.org)
Once they have reached their destination, however, these optical signals have to be converted into electrical signals for subsequent processing in the computer. (sciencedaily.com)
In general, our models for the four R's are much less refined than those for electrical signals in neurons. (scientificamerican.com)