Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.

<h4>Introduction</h4>While the directionality of tactile motion processing has been studied extensively, tactile speed processing and its relationship to direction is little-researched and poorly understood. We investigated this relationship in humans using the 'tactile speed aftere...

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Autores principales:	Sarah McIntyre, Alex O Holcombe, Ingvars Birznieks, Tatjana Seizova-Cajic
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ad29024d7fa2490fa1543a00c8472e71
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spelling	oai:doaj.org-article:ad29024d7fa2490fa1543a00c8472e712021-11-18T07:04:23ZTactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.1932-620310.1371/journal.pone.0045438https://doaj.org/article/ad29024d7fa2490fa1543a00c8472e712012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23029010/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Introduction</h4>While the directionality of tactile motion processing has been studied extensively, tactile speed processing and its relationship to direction is little-researched and poorly understood. We investigated this relationship in humans using the 'tactile speed aftereffect' (tSAE), in which the speed of motion appears slower following prolonged exposure to a moving surface.<h4>Method</h4>We used psychophysical methods to test whether the tSAE is direction sensitive. After adapting to a ridged moving surface with one hand, participants compared the speed of test stimuli on the adapted and unadapted hands. We varied the direction of the adapting stimulus relative to the test stimulus.<h4>Results</h4>Perceived speed of the surface moving at 81 mms(-1) was reduced by about 30% regardless of the direction of the adapting stimulus (when adapted in the same direction, Mean reduction = 23 mms(-1), SD = 11; with opposite direction, Mean reduction = 26 mms(-1), SD = 9). In addition to a large reduction in perceived speed due to adaptation, we also report that this effect is not direction sensitive.<h4>Conclusions</h4>Tactile motion is susceptible to speed adaptation. This result complements previous reports of reliable direction aftereffects when using a dynamic test stimulus as together they describe how perception of a moving stimulus in touch depends on the immediate history of stimulation. Given that the tSAE is not direction sensitive, we argue that peripheral adaptation does not explain it, because primary afferents are direction sensitive with friction-creating stimuli like ours (thus motion in their preferred direction should result in greater adaptation, and if perceived speed were critically dependent on these afferents' response intensity, the tSAE should be direction sensitive). The adaptation that reduces perceived speed therefore seems to be of central origin.Sarah McIntyreAlex O HolcombeIngvars BirznieksTatjana Seizova-CajicPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 9, p e45438 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sarah McIntyre Alex O Holcombe Ingvars Birznieks Tatjana Seizova-Cajic Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
description	<h4>Introduction</h4>While the directionality of tactile motion processing has been studied extensively, tactile speed processing and its relationship to direction is little-researched and poorly understood. We investigated this relationship in humans using the 'tactile speed aftereffect' (tSAE), in which the speed of motion appears slower following prolonged exposure to a moving surface.<h4>Method</h4>We used psychophysical methods to test whether the tSAE is direction sensitive. After adapting to a ridged moving surface with one hand, participants compared the speed of test stimuli on the adapted and unadapted hands. We varied the direction of the adapting stimulus relative to the test stimulus.<h4>Results</h4>Perceived speed of the surface moving at 81 mms(-1) was reduced by about 30% regardless of the direction of the adapting stimulus (when adapted in the same direction, Mean reduction = 23 mms(-1), SD = 11; with opposite direction, Mean reduction = 26 mms(-1), SD = 9). In addition to a large reduction in perceived speed due to adaptation, we also report that this effect is not direction sensitive.<h4>Conclusions</h4>Tactile motion is susceptible to speed adaptation. This result complements previous reports of reliable direction aftereffects when using a dynamic test stimulus as together they describe how perception of a moving stimulus in touch depends on the immediate history of stimulation. Given that the tSAE is not direction sensitive, we argue that peripheral adaptation does not explain it, because primary afferents are direction sensitive with friction-creating stimuli like ours (thus motion in their preferred direction should result in greater adaptation, and if perceived speed were critically dependent on these afferents' response intensity, the tSAE should be direction sensitive). The adaptation that reduces perceived speed therefore seems to be of central origin.
format	article
author	Sarah McIntyre Alex O Holcombe Ingvars Birznieks Tatjana Seizova-Cajic
author_facet	Sarah McIntyre Alex O Holcombe Ingvars Birznieks Tatjana Seizova-Cajic
author_sort	Sarah McIntyre
title	Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
title_short	Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
title_full	Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
title_fullStr	Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
title_full_unstemmed	Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
title_sort	tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/ad29024d7fa2490fa1543a00c8472e71
work_keys_str_mv	AT sarahmcintyre tactilemotionadaptationreducesperceivedspeedbutshowsnoevidenceofdirectionsensitivity AT alexoholcombe tactilemotionadaptationreducesperceivedspeedbutshowsnoevidenceofdirectionsensitivity AT ingvarsbirznieks tactilemotionadaptationreducesperceivedspeedbutshowsnoevidenceofdirectionsensitivity AT tatjanaseizovacajic tactilemotionadaptationreducesperceivedspeedbutshowsnoevidenceofdirectionsensitivity
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Tactile motion adaptation reduces perceived speed but shows no evidence of direction sensitivity.

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