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Senses are the physiological methods of perception. The senses and their operation, classification, and theory are overlapping topics studied by a variety of fields, most notably neuroscience, cognitive psychology (or cognitive science), and philosophy of perception. The nervous system has a specific sensory system, or organ, dedicated to each sense. This is no firm agreement among neurologists as to the number of senses because of differing definitions of what constitutes a sense. One definition states that an exteroceptive sense is a faculty by which outside stimuli are perceived.[1] The traditional five senses are sight, hearing, touch, smell, taste a classification attributed to Aristotle.[2] Humans also have at least six additional senses (a total of eleven including interoceptive senses) that include nociception (pain), equilibrioception (balance), proprioception & kinesthesia (joint motion and acceleration), sense of time, thermoception (temperature differences), and in some a weak magnetoception (direction)[3]. One commonly recognized categorisation for human senses is as follows chemoreception; photoreception; mechanoreception; and thermoception. Indeed, all human senses fit into one of these four categories. Different senses also exist in other creatures, for example electroreception.
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