Arm crossing updates brain functional connectivity of the left posterior parietal cortex

The unusual configuration of body parts can cause illusions. For example, when tactile stimuli are delivered to crossed arms a reversal of subjective temporal ordering occurs. Our group has previously demonstrated that arm crossing without sensory stimuli causes activity changes in the left posterio...

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Main Authors:	Ora, Hiroki, Wada, Makoto, Salat, David, Kansaku, Kenji
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4908406/

id	pubmed-4908406
recordtype	oai_dc
spelling	pubmed-49084062016-06-15 Arm crossing updates brain functional connectivity of the left posterior parietal cortex Ora, Hiroki Wada, Makoto Salat, David Kansaku, Kenji Article The unusual configuration of body parts can cause illusions. For example, when tactile stimuli are delivered to crossed arms a reversal of subjective temporal ordering occurs. Our group has previously demonstrated that arm crossing without sensory stimuli causes activity changes in the left posterior parietal cortex (PPC) and an assessment of tactile temporal order judgments (TOJs) revealed a positive association between activity in this area, especially the left intraparietal sulcus (IPS), and the degree of the crossed-hand illusion. Thus, the present study investigated how the IPS actively relates to other cortical areas under arms-crossed and -uncrossed conditions by analyzing the functional connectivity of the IPS. Regions showing connectivity with the IPS overlapped with regions within the default mode network (DMN) but the IPS also showed connectivity with other brain areas, including the frontoparietal control network (FPCN). The right middle/inferior frontal gyrus (MFG/IFG), which is included in the FPCN, showed greater connectivity in the arms-crossed condition than in the arms-uncrossed condition. These findings suggest that there is state-dependent connectivity during arm crossing, and that the left IPS may play an important role during the spatio-temporal updating of arm positions. Nature Publishing Group 2016-06-15 /pmc/articles/PMC4908406/ /pubmed/27302746 http://dx.doi.org/10.1038/srep28105 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Ora, Hiroki Wada, Makoto Salat, David Kansaku, Kenji
spellingShingle	Ora, Hiroki Wada, Makoto Salat, David Kansaku, Kenji Arm crossing updates brain functional connectivity of the left posterior parietal cortex
author_facet	Ora, Hiroki Wada, Makoto Salat, David Kansaku, Kenji
author_sort	Ora, Hiroki
title	Arm crossing updates brain functional connectivity of the left posterior parietal cortex
title_short	Arm crossing updates brain functional connectivity of the left posterior parietal cortex
title_full	Arm crossing updates brain functional connectivity of the left posterior parietal cortex
title_fullStr	Arm crossing updates brain functional connectivity of the left posterior parietal cortex
title_full_unstemmed	Arm crossing updates brain functional connectivity of the left posterior parietal cortex
title_sort	arm crossing updates brain functional connectivity of the left posterior parietal cortex
description	The unusual configuration of body parts can cause illusions. For example, when tactile stimuli are delivered to crossed arms a reversal of subjective temporal ordering occurs. Our group has previously demonstrated that arm crossing without sensory stimuli causes activity changes in the left posterior parietal cortex (PPC) and an assessment of tactile temporal order judgments (TOJs) revealed a positive association between activity in this area, especially the left intraparietal sulcus (IPS), and the degree of the crossed-hand illusion. Thus, the present study investigated how the IPS actively relates to other cortical areas under arms-crossed and -uncrossed conditions by analyzing the functional connectivity of the IPS. Regions showing connectivity with the IPS overlapped with regions within the default mode network (DMN) but the IPS also showed connectivity with other brain areas, including the frontoparietal control network (FPCN). The right middle/inferior frontal gyrus (MFG/IFG), which is included in the FPCN, showed greater connectivity in the arms-crossed condition than in the arms-uncrossed condition. These findings suggest that there is state-dependent connectivity during arm crossing, and that the left IPS may play an important role during the spatio-temporal updating of arm positions.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4908406/
_version_	1613594877190209536

Arm crossing updates brain functional connectivity of the left posterior parietal cortex

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