Somatosensory cortical representation of the body size.

Autor:	Giurgola S; Department of Medicine and Surgery, Ph.D. Program in Neuroscience, University of Milano-Bicocca, Monza, Italy.; Department of Psychology & Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milan, Italy., Pisoni A; Department of Psychology & Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milan, Italy., Maravita A; Department of Psychology & Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milan, Italy., Vallar G; Department of Psychology & Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milan, Italy.; IRCCS Istituto Auxologico Italiano, Laboratory of Neuropsychology, Milan, Italy., Bolognini N; Department of Psychology & Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milan, Italy.; IRCCS Istituto Auxologico Italiano, Laboratory of Neuropsychology, Milan, Italy.
Jazyk:	angličtina
Zdroj:	Human brain mapping [Hum Brain Mapp] 2019 Aug 15; Vol. 40 (12), pp. 3534-3547. Date of Electronic Publication: 2019 May 06.
DOI:	10.1002/hbm.24614
Abstrakt:	The knowledge of the size of our own body parts is essential for accurately moving in space and efficiently interact with objects. A distorted perceptual representation of the body size often represents a core diagnostic criterion for some psychopathological conditions. The metric representation of the body was shown to depend on somatosensory afferences: local deafferentation indeed causes a perceptual distortion of the size of the anesthetized body part. A specular effect can be induced by altering the cortical map of body parts in the primary somatosensory cortex. Indeed, the present study demonstrates, in healthy adult participants, that repetitive Transcranial Magnetic Stimulation to the somatosensory cortical map of the hand in both hemispheres causes a perceptual distortion (i.e., an overestimation) of the size of the participants' own hand (Experiments 1-3), which does not involve other body parts (i.e., the foot, Experiment 2). Instead, the stimulation of the inferior parietal lobule of both hemispheres does not affect the perception of the own body size (Experiment 4). These results highlight the role of the primary somatosensory cortex in the building up and updating of the metric of body parts: somatosensory cortical activity not only shapes our somatosensation, it also affects how we perceive the dimension of our body. (© 2019 Wiley Periodicals, Inc.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu