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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/64439

    Título
    Visual processing speed in hemianopia patients secondary to acquired brain injury: a new assessment methodology
    Autor
    Mena García, LauraAutoridad UVA Orcid
    Maldonado López, Miguel JoséAutoridad UVA Orcid
    Fernández Martínez, ItziarAutoridad UVA Orcid
    Coco Martín, María BegoñaAutoridad UVA Orcid
    Finat Saez, Jaime
    Martínez Jiménez, José Luis
    Pastor Jimeno, José CarlosAutoridad UVA
    Arenillas Lara, Juan FranciscoAutoridad UVA
    Año del Documento
    2020
    Editorial
    BMC
    Descripción
    Producción Científica
    Documento Fuente
    Journal of NeuroEngineering and Rehabilitation, January 2020, vol. 17, n. 1, 12
    Resumen
    Background: There is a clinical need to identify diagnostic parameters that objectively quantify and monitor the effective visual ability of patients with homonymous visual field defects (HVFDs). Visual processing speed (VPS) is an objective measure of visual ability. It is the reaction time (RT) needed to correctly search and/or reach for a visual stimulus. VPS depends on six main brain processing systems: auditory-cognitive, attentional, working memory, visuocognitive, visuomotor, and executive. We designed a new assessment methodology capable of activating these six systems and measuring RTs to determine the VPS of patients with HVFDs. Methods: New software was designed for assessing subject visual stimulus search and reach times (S-RT and R-RT respectively), measured in seconds. Thirty-two different everyday visual stimuli were divided in four complexity groups that were presented along 8 radial visual field positions at three different eccentricities (10o, 20o, and 30o). Thus, for each HVFD and control subject, 96 S- and R-RT measures related to VPS were registered. Three additional variables were measured to gather objective data on the validity of the test: eye-hand coordination mistakes (ehcM), eye-hand coordination accuracy (ehcA), and degrees of head movement (dHM, measured by a head-tracker system). HVFD patients and healthy controls (30 each) matched by age and gender were included. Each subject was assessed in a single visit. VPS measurements for HFVD patients and control subjects were compared for the complete test, for each stimulus complexity group, and for each eccentricity. Results: VPS was significantly slower (p < 0.0001) in the HVFD group for the complete test, each stimulus complexity group, and each eccentricity. For the complete test, the VPS of the HVFD patients was 73.0% slower than controls. They also had 335.6% more ehcMs, 41.3% worse ehcA, and 189.0% more dHMs than the controls. Conclusions: Measurement of VPS by this new assessment methodology could be an effective tool for objectively quantifying the visual ability of HVFD patients. Future research should evaluate the effectiveness of this novel method for measuring the impact that any specific neurovisual rehabilitation program has for these patients.
    Palabras Clave
    Visual processing speed
    Hemianopia
    Visual ability
    Homonymous visual field defects
    Acquired brain injury
    Eye-hand coordination
    Saccadic eye movements
    Visual assessment
    Neurovisual rehabilitation
    ISSN
    1743-0003
    Revisión por pares
    SI
    DOI
    10.1186/s12984-020-0650-5
    Patrocinador
    Sacyl (GRS/783/A/13)
    Version del Editor
    https://jneuroengrehab.biomedcentral.com/articles/10.1186/s12984-020-0650-5
    Propietario de los Derechos
    © The Author(s). 2020
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/64439
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
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    • DEP52 - Artículos de revista [181]
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