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Does the crossed-limb deficit affect the uncrossed portions of limbs?

Azañón, E; Radulova, S; Haggard, P; Longo, MR; (2016) Does the crossed-limb deficit affect the uncrossed portions of limbs? Journal of Experimental Psychology: Human Perception and Performance , 42 (9) pp. 1320-1331. 10.1037/xhp0000206. Green open access

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Abstract

When locating touch, we remap its location from skin-based to external coordinates as a function of body posture. While remapping is thought to occur whenever there is tactile input, research has focused on a special case, the crossed-hands deficit, where tactile localization is impaired when the limbs are crossed compared with uncrossed. To date, these studies have always stimulated portions of the limbs that are crossed, such as a finger of each hand. It is therefore unknown whether the deficit induced by arm crossing is specific to the crossed portion of the limb or affects the limb as a whole. In Experiments 1 and 2, we stimulated the shoulders and elbows and found that tactile localization, measured with temporal order judgments, was unaffected by crossing the forearms. In Experiment 3, a crossed-limbs deficit was observed for touches on a single skin location when that location was distal-but not proximal-to the crossing point of the arms. In Experiment 4, we found a similar crossed-limbs deficit irrespective of how far distally to the crossing point touch was applied. Together, these results demonstrate that crossing the limbs affects tactile perception only distal to the point of crossing. The process of remapping tactile events does not take into account the end-point location of the limb, but an extremely precise metric description of the touch relative to the configuration of both arms. (PsycINFO Database Record

Type: Article
Title: Does the crossed-limb deficit affect the uncrossed portions of limbs?
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1037/xhp0000206
Publisher version: http://doi.org/10.1037/xhp0000206
Language: English
Additional information: Copyright © 2016 APA. This article may not exactly replicate the authoritative document published in the APA journal. It is not the copy of record.
Keywords: Remapping, tactile processing, crossed-hands deficit, temporal order judgment, spatial reference frame
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Institute of Cognitive Neuroscience
URI: https://discovery.ucl.ac.uk/id/eprint/1486076
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