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Article: Influence of Hemianopic Visual Field Loss on Visual Motor Control

TitleInfluence of Hemianopic Visual Field Loss on Visual Motor Control
Authors
Issue Date2013
PublisherPublic Library of Science. The Journal's web site is located at http://www.plosone.org/home.action
Citation
PLoS ONE, 2013, v. 8 n. 2, article no. e56615 How to Cite?
AbstractBackground Homonymous hemianopia (HH) is an anisotropic visual impairment characterized by the binocular inability to see one side of the visual field. Patients with HH often misperceive visual space. Here we investigated how HH affects visual motor control. Methods and Findings Seven patients with complete HH and no neglect or cognitive decline and seven gender- and age-matched controls viewed displays in which a target moved randomly along the horizontal or the vertical axis. They used a joystick to control the target movement to keep it at the center of the screen. We found that the mean deviation of the target position from the center of the screen along the horizontal axis was biased toward the blind side for five out of seven HH patients. More importantly, while the normal vision controls showed more precise control and larger response amplitudes when the target moved along the horizontal rather than the vertical axis, the control performance of the HH patients was not different between these two target motion experimental conditions. Conclusions Compared with normal vision controls, HH affected patients' control performance when the target moved horizontally (i.e., along the axis of their visual impairment) rather than vertically. We conclude that hemianopia affects the use of visual information for online control of a moving target specific to the axis of visual impairment. The implications of the findings for driving in hemianopic patients are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/199582
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorNiehorster, DCen_US
dc.contributor.authorPeli, Een_US
dc.contributor.authorHaun, Aen_US
dc.contributor.authorLi, Len_US
dc.date.accessioned2014-07-22T01:23:56Z-
dc.date.available2014-07-22T01:23:56Z-
dc.date.issued2013en_US
dc.identifier.citationPLoS ONE, 2013, v. 8 n. 2, article no. e56615en_US
dc.identifier.urihttp://hdl.handle.net/10722/199582-
dc.description.abstractBackground Homonymous hemianopia (HH) is an anisotropic visual impairment characterized by the binocular inability to see one side of the visual field. Patients with HH often misperceive visual space. Here we investigated how HH affects visual motor control. Methods and Findings Seven patients with complete HH and no neglect or cognitive decline and seven gender- and age-matched controls viewed displays in which a target moved randomly along the horizontal or the vertical axis. They used a joystick to control the target movement to keep it at the center of the screen. We found that the mean deviation of the target position from the center of the screen along the horizontal axis was biased toward the blind side for five out of seven HH patients. More importantly, while the normal vision controls showed more precise control and larger response amplitudes when the target moved along the horizontal rather than the vertical axis, the control performance of the HH patients was not different between these two target motion experimental conditions. Conclusions Compared with normal vision controls, HH affected patients' control performance when the target moved horizontally (i.e., along the axis of their visual impairment) rather than vertically. We conclude that hemianopia affects the use of visual information for online control of a moving target specific to the axis of visual impairment. The implications of the findings for driving in hemianopic patients are discussed.en_US
dc.languageengen_US
dc.publisherPublic Library of Science. The Journal's web site is located at http://www.plosone.org/home.action-
dc.relation.ispartofPLoS ONEen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleInfluence of Hemianopic Visual Field Loss on Visual Motor Controlen_US
dc.typeArticleen_US
dc.identifier.emailNiehorster, DC: dcnie@hku.hken_US
dc.identifier.emailLi, L: lili@hku.hken_US
dc.identifier.authorityLi, L=rp00636en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1371/journal.pone.0056615en_US
dc.identifier.pmid23457594-
dc.identifier.pmcidPMC3574089-
dc.identifier.hkuros231418en_US
dc.identifier.hkuros218511-
dc.identifier.volume8en_US
dc.identifier.issue2en_US
dc.identifier.isiWOS:000315603700066-

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