Attending means paying close attention to a signal. A signal in signal processing is a function that communicates knowledge about a phenomenon.
Any variable that is subject to variation in both space and time can be utilized as a signal to communicate between observers. Any visible change in a quantity over time or space (a time series), even if it does not carry information, can be referred to as a signal.
In nature, signals can be activities taken by an organism to alert other knowledge species. These actions can range from plants releasing chemicals to signal warn other plants of a nearby predator to animals making sounds or motions to inform other animals of food. All species knowledge use cell signaling to communicate even at the cellular level.
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