April 20, 2017

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 epidermis that fireplace motion potentials whilst the outside is touched frivolously which makes them relatively vital in affective touch.  usually neuroscientific examine has inquisitive about extra discriminative and haptic houses of contact that are mediated by way of large myelinated afferents and the coding houses and sensible association of unmyelinated CT afferents were studied a lot less.  The proposed quantity will draw jointly latest wisdom during this nascent box. Separate sections will handle (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) scientific relevance, (6) advertisement relevance, and (7) destiny study considerations.​

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However, C-LTMR RF size may be overestimated if more intense stimuli are used (Bessou and Perl 1969; Iggo and Kornhuber 1977). For example, the center of the RFs were found to be more sensitive than the edges, hence stimulation at perithreshold intensity yielded smaller RFs than suprathreshold stimulation (Iggo 1960; Iggo and Kornhuber 1977) (Fig. 1). Species differences in C-LTMR expression have also been noted, where cats generally appear to have a higher proportion of C-LTMRs compared to other mammals.

Trends Neurosci 6:27–32 Kandel ER, Schwartz JH, Jessel TM, Siegelbaum SA, Hudspeth AJ (eds) (2013) Principles of neural science, 5th edn. McGraw-Hill, New York Kenins P (1982) Responses of single nerve fibres to capsaicin applied to the skin. Neurosci Lett 29(1):83–88 Kumazawa T, Perl ER (1977) Primate cutaneous sensory units with unmyelinated (C) afferent fibers. J Neurophysiol 40:1325–1338 (They point out that CT are scarce in distal arm regions) Li L, Rutlin M, Abraira VE, Cassidy C, Kus L, Gong S, Jankowski MP, Luo W, Heintz N, Koerber HR, Woodbury CJ, Ginty DD (2011) The functional organization of cutaneous low-threshold mechanosensory neurons.

2003). While it has been long recognized that both Aδ- and C-fiber nociceptors contribute to pain perception, myelinated Aβ-fibers are held to be the main nonnociceptive “touch” fibers. For these reasons, the existence of a class of unmyelinated C-fiber that appears to be specifically tuned to gentle stroking of the hairy skin (Olausson et al. 2010) with objects at body temperature (Ackerley et al. 2014) is striking. Activation of these fibers in humans evokes pleasant sensations and, as such, has been posited to subserve affective touch, consistent with the putative affective-motivational role of C-nociceptors.

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