Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.

<h4>Introduction</h4>Organization of tactile input into somatotopic maps enables us to localize stimuli on the skin. Temporal relationships between stimuli are important in maintaining the maps and influence perceived locations of discrete stimuli. This points to the spatiotemporal stimu...

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Autores principales:	Tatjana Seizova-Cajic, Janet L Taylor
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bb3d60d487e345e8a5bb29837510b675
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spelling	oai:doaj.org-article:bb3d60d487e345e8a5bb29837510b6752021-11-18T08:29:27ZSomatosensory space abridged: rapid change in tactile localization using a motion stimulus.1932-620310.1371/journal.pone.0090892https://doaj.org/article/bb3d60d487e345e8a5bb29837510b6752014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24603595/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Introduction</h4>Organization of tactile input into somatotopic maps enables us to localize stimuli on the skin. Temporal relationships between stimuli are important in maintaining the maps and influence perceived locations of discrete stimuli. This points to the spatiotemporal stimulation sequences experienced as motion as a potential powerful organizing principle for spatial maps. We ask whether continuity of the motion determines perceived location of areas in the motion path using a novel tactile stimulus designed to 'convince' the brain that a patch of skin does not exist by rapidly skipping over it.<h4>Method</h4>Two brushes, fixed 9 cm apart, moved back and forth along the forearm (at 14.5 cm s-1), crossing a 10-cm long 'occluder', which prevented skin stimulation in the middle of the motion path. Crucially, only one brush contacted the skin at any one time, and the occluder was traversed almost instantaneously. Participants pointed with the other arm towards the felt location of the brush when it was briefly halted during repetitive motion, and also reported where they felt they had been brushed.<h4>Results</h4>Participants did not report the 10-cm gap in stimulation - the motion path was perceptually completed. Pointing results showed that brush path was 'abridged': locations immediately on either side of the occluder, as well as location at the ends of the brush path, were perceived to be >3 cm closer to each other than in the control condition (F(1,9) = 7.19; p = .025 and F(1,9) = 6.02, p = .037 respectively). This bias increased with prolonged stimulation.<h4>Conclusions</h4>An illusion of completion induced by our Abridging stimulus is accompanied by gross mislocalization, suggesting that motion determines perceived locations. The effect reveals the operation of Gestalt principles in touch and suggests the existence of dynamic maps that quickly adjust to the current input pattern.Tatjana Seizova-CajicJanet L TaylorPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 3, p e90892 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tatjana Seizova-Cajic Janet L Taylor Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
description	<h4>Introduction</h4>Organization of tactile input into somatotopic maps enables us to localize stimuli on the skin. Temporal relationships between stimuli are important in maintaining the maps and influence perceived locations of discrete stimuli. This points to the spatiotemporal stimulation sequences experienced as motion as a potential powerful organizing principle for spatial maps. We ask whether continuity of the motion determines perceived location of areas in the motion path using a novel tactile stimulus designed to 'convince' the brain that a patch of skin does not exist by rapidly skipping over it.<h4>Method</h4>Two brushes, fixed 9 cm apart, moved back and forth along the forearm (at 14.5 cm s-1), crossing a 10-cm long 'occluder', which prevented skin stimulation in the middle of the motion path. Crucially, only one brush contacted the skin at any one time, and the occluder was traversed almost instantaneously. Participants pointed with the other arm towards the felt location of the brush when it was briefly halted during repetitive motion, and also reported where they felt they had been brushed.<h4>Results</h4>Participants did not report the 10-cm gap in stimulation - the motion path was perceptually completed. Pointing results showed that brush path was 'abridged': locations immediately on either side of the occluder, as well as location at the ends of the brush path, were perceived to be >3 cm closer to each other than in the control condition (F(1,9) = 7.19; p = .025 and F(1,9) = 6.02, p = .037 respectively). This bias increased with prolonged stimulation.<h4>Conclusions</h4>An illusion of completion induced by our Abridging stimulus is accompanied by gross mislocalization, suggesting that motion determines perceived locations. The effect reveals the operation of Gestalt principles in touch and suggests the existence of dynamic maps that quickly adjust to the current input pattern.
format	article
author	Tatjana Seizova-Cajic Janet L Taylor
author_facet	Tatjana Seizova-Cajic Janet L Taylor
author_sort	Tatjana Seizova-Cajic
title	Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
title_short	Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
title_full	Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
title_fullStr	Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
title_full_unstemmed	Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
title_sort	somatosensory space abridged: rapid change in tactile localization using a motion stimulus.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/bb3d60d487e345e8a5bb29837510b675
work_keys_str_mv	AT tatjanaseizovacajic somatosensoryspaceabridgedrapidchangeintactilelocalizationusingamotionstimulus AT janetltaylor somatosensoryspaceabridgedrapidchangeintactilelocalizationusingamotionstimulus
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Somatosensory space abridged: rapid change in tactile localization using a motion stimulus.

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