Visual processing speed in hemianopia patients secondary to acquired brain injury: a new assessment methodology
Autor: | Jaime Finat-Saez, María B. Coco-Martín, Laura Mena-Garcia, Juan F. Arenillas, Jose L. Martinez-Jimenez, Itziar Fernández, Jose C. Pastor-Jimeno, Miguel J. Maldonado-Lopez |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Adult
Male medicine.medical_specialty Saccadic eye movements Visual perception genetic structures medicine.medical_treatment Poison control Health Informatics 050105 experimental psychology lcsh:RC321-571 Visual processing 03 medical and health sciences Hemianopia 0302 clinical medicine Physical medicine and rehabilitation medicine Reaction Time Humans 0501 psychology and cognitive sciences Visual assessment Acquired brain injury Visual ability lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry Neurovisual rehabilitation Aged Visual processing speed Eye–hand coordination Rehabilitation Working memory business.industry Research Eye-hand coordination 05 social sciences Middle Aged medicine.disease Visual field Case-Control Studies Homonymous visual field defects Visual Perception Hemianopsia Female business 030217 neurology & neurosurgery Photic Stimulation Psychomotor Performance Software |
Zdroj: | Journal of NeuroEngineering and Rehabilitation, Vol 17, Iss 1, Pp 1-14 (2020) Journal of NeuroEngineering and Rehabilitation |
ISSN: | 1743-0003 |
Popis: | 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 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. |
Databáze: | OpenAIRE |
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