Download Affective Touch and the Neurophysiology of CT Afferents by Håkan Olausson, Johan Wessberg, India Morrison, Francis PDF

By Håkan Olausson, Johan Wessberg, India Morrison, Francis McGlone

CT afferents are receptors in mammalian furry pores and skin that fireplace motion potentials while the outside is touched flippantly which makes them relatively very important in affective touch.  usually neuroscientific study has involved in extra discriminative and haptic houses of contact that are mediated via large myelinated afferents and the coding houses and useful association of unmyelinated CT afferents were studied a lot less.  The proposed quantity will draw jointly current wisdom during this nascent box. Separate sections will deal with (1) how we will be able to degree affective contact, (2) CT constitution and body structure, (3) CT processing, (4) the contribution of CTs to sexual habit, (5) medical relevance, (6) advertisement relevance, and (7) destiny examine considerations.​

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Extra info for Affective Touch and the Neurophysiology of CT Afferents

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17. The findings demonstrate significant correlations between CT activity and estimates of pleasantness when two different stimulus parameters were varied, that is, the speed of an object moving over the skin surface 26 Å. Vallbo et al. Fig. 17 Dependence of psychoneural relation on temperature of moving touch stimuli. Lefthand plot shows CT response (n = 8) to an object moving over the receptive field at different speeds. Three different object temperatures are color coded: black—neutral, red—warm, and blue—cool.

B) Delayed acceleration of impulse discharge started after about 10 s. (a, b) Originate from the same recording displayed on different time scales After-Discharge and Tickle Hypothesis Long-lasting after-discharge in thin mechanoreceptive afferents was originally described by Zotterman (1939) in the cat and led him to formulate the tickle hypothesis, that is, that an essential role of unmyelinated tactile afferents is to account for the ticklish sensation associated with light touch. Microneurography studies confirm that there is a marked difference between the fast and the slow tactile systems in man with regard to after-discharge.

For example, for a sensory fiber to faithfully follow high frequency vibration of the skin, the response properties of the terminal ending and the associated fiber must allow for rapid adaption to the input as well as fast conduction velocity. Pacinian corpuscles and their associated myelinated Aβ fibers amply fulfill these requirements, yielding increasing spike rates with increasing stimulation frequencies. Regarding C-LTMRs, considering the remarkable sensitivity of longitudinal 2 Functional Properties of C-Low Threshold Mechanoreceptors (C-LTMRs)… 35 lanceolate endings situated around the base of the hair follicle together with the slow conduction velocity typical of unmyelinated C-fibers, human C-tactiles (Nordin 1990) and nonhuman C-LTMRs appear to be well suited to gentle, slowly moving stimulation of hairy skin (Zotterman 1939; Maruhashi et al.

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