Document Detail

Estimating the position of simulated phosphenes using a tactile guide.
MedLine Citation:
PMID:  21864454     Owner:  NLM     Status:  In-Data-Review    
A visual prosthesis provides usable visual information to the patient in the form of phosphenes, that is, punctate photic sensations seen after electrical stimulation. Stimulation via different electrodes results in phosphenes in different positions within the visual field. Simulation studies can provide data on the possible limitations of prosthetic stimulation. We used a head mounted screen to monocularly present constant or flickering light spots of different sizes, or luminance to normally sighted subjects. Subjects were asked to judge the location of the spots using a polar coordinate tactile guide; positioning average error and dispersion were analyzed. With the increase of eccentricity, the positioning average error and dispersion were also increased. The performances under large, stable and high luminance conditions were better than that under small, flickering and low luminance conditions, respectively. Repeated training sessions were shown to significantly improve the positioning performance.
Yanyu Lu; Jin Fan; Chunaqing Zhou; Ying Zhao; Jing Wang; Chen Tao; Qiushi Ren; Xinyu Chai
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Seeing and perceiving     Volume:  24     ISSN:  1878-4755     ISO Abbreviation:  Seeing Perceiving     Publication Date:  2011  
Date Detail:
Created Date:  2011-08-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101531524     Medline TA:  Seeing Perceiving     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  125-40     Citation Subset:  IM    
Department of Biomedical Engineering, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
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