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Dysesthesia is an unpleasant, abnormal sense of touch. Its etymology comes from the Greek word "dys," meaning "bad," and "aesthesis," which means "sensation" (abnormal sensation). It often presents as pain [1] but may also present as an inappropriate, but not discomforting
The somatosensory system includes multiple types of sensations from the body. This includes light, touch, pain, pressure, temperature, and joint /muscle sense. [7] Each of these are categorized in three different areas: discriminative touch, pain and temperature, and proprioception.
Other examples of referred sensation include sensations of temperature, pain, and pressure. [1] Referred itch is commonly observed in completely healthy individuals and can often go unnoticed depending upon the particular person's self-awareness of their itches and the causes of those itches.
The somatosensory cortex encodes incoming sensory information from receptors all over the body. Affective touch is a type of sensory information that elicits an emotional reaction and is usually social in nature, such as a physical human touch. This type of information is actually coded differently than other sensory information.
Two-point discrimination (2PD) is the ability to discern that two nearby objects touching the skin are truly two distinct points, not one.It is often tested with two sharp points during a neurological examination [1]: 632 [2]: 71 and is assumed to reflect how finely innervated an area of skin is.
In fact, a 2014 study of 51 people (102 human hands) indicated that the average hand had 150 different bacterial species living on it. Not all bacteria get you sick, but it's a sobering reminder ...
A tactile illusion is an illusion that affects the sense of touch.Some tactile illusions require active touch (e.g., movement of the fingers or hands), whereas others can be evoked passively (e.g., with external stimuli that press against the skin).
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