The way in which the nervous system differentiates between the various forms of sensory experience has been a central issue since the beginnings of sensory physiology. A brief history of the major theories is given by Sinclair (1967). The notion of specificity of cutaneous sensation can be attributed to Bell (1811), and the idea was forwarded by Müller’s doctrine of specific nerve energies (Müller, 1840–1842). However, Müller had in mind the Aristotelean five senses and lumped together the sensations derived from the body surface under the category of “touch.” According to Sinclair (1967), Volkmann extended the specificity concept in 1844 to include the postulate of separate nerve endings for each variety of sensation arising from cutaneous stimulation.
KeywordsSensory Receptor Cold Spot Sensory Pathway Sensory Channel Cutaneous Sensation
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