There 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 a sense is a faculty by which outside stimuli are perceived.[1] The conventional five senses are sight, hearing, touch, smell, taste: a classification traditionally attributed to Aristotle.[2] However, humans have at least nine different senses, and there are at least two other senses in other organisms.
A broadly acceptable definition of a sense would be "a system that consists of a group sensory cell types that responds to a specific physical phenomenon, and that corresponds to a particular group of regions within the brain where the signals are received and interpreted." Disputes about the number of senses arise typically regarding the classification of the various cell types and their mapping to regions of the brain.
Source Wiki Free Encylcopedia
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