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
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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