Senses provide information about the body and its environment. Sensory receptors in the eyes, ears, nose, tongue and skin are cells specialized to detect a specific stimulus, such as light, sound, a chemical, pressure or temperature. The information is converted into nerve signals carried to the brain, where it is turned into meaningful sensations. The brain may answer with immediate behavior, such as catching a falling ruler or pulling a hand from a hot pan, or it may store the information as a memory. How the signal travels is not part of this week.