Emotion is a form of reflection of a living organism to the objective reality in the form of subjective experience. A variety of stimuli acting on the organism causes not only machine-responses in the form of movements or autonomic responses (increase or decrease in heart rate, changes in frequency and depth of breathing, etc.), but also the accompanying subjective experiences, called emotions: joy, anger, pain, fear and pleasure. It is enough quite a bit to communicate with pets and we can say with confidence that our organism is capable to suffer merry, love and hate. Or using online Macys coupon codes and buying some interesting item we feel joy and happiness. The subjective experiences are characteristic of mammals. But are there emotions in more primitive organisms such as reptiles, amphibians or fish? If it is so, the origin of emotional response is rooted in the distant history of life on Earth.
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