Emotions: The Product of Sensory Input

Just like our senses, our body has signals like breathing, heartbeat, metabolism and other internal movements that may be considered a source of sensory input for the brain. This, when mixed with our original sensory inputs like touch, sight and hearing, can create emotions.

Example: a stomachache can be seen as meaning something else just with the accompanying signal being good (a lover coming to see you) or bad (sniffing something horrible).