Effects of simulated visual acuity and ocular motility impairments on SSVEP brain-computer interface performance: An experiment with Shuffle Speller
| Autor: | Tab Memmott, Barry Oken, Deniz Erdogmus, Jack Wiedrick, Steven Bedrick, Brandon Eddy, Melanie Fried-Oken, Fernando Quivira, Matt Higger, Betts Peters, Michelle Kinsella, Shiran Dudy |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
medicine.medical_specialty
Visual acuity genetic structures Computer science Interface (computing) Ocular motility Visual impairment Biomedical Engineering Eye movement Workload Audiology Article Human-Computer Interaction 03 medical and health sciences Behavioral Neuroscience 0302 clinical medicine 030221 ophthalmology & optometry medicine Electrical and Electronic Engineering medicine.symptom 030217 neurology & neurosurgery Brain–computer interface |
| Popis: | Individuals with severe speech and physical impairments may have concomitant visual acuity impairments (VAI) or ocular motility impairments (OMI) impacting visual BCI use. We report on the use of the Shuffle Speller typing interface for an SSVEP BCI copy-spelling task under three conditions: simulated VAI, simulated OMI, and unimpaired vision. To mitigate the effect of visual impairments, we introduce a method that adaptively selects a user-specific trial length to maximize expected information transfer rate (ITR); expected ITR is shown to closely approximate the rate of correct letter selections. All participants could type under the unimpaired and simulated VAI conditions, with no significant differences in typing accuracy or speed. Most participants (31 of 37) could not type under the simulated OMI condition; some achieved high accuracy but with slower typing speeds. Reported workload and discomfort were low, and satisfaction high, under the unimpaired and simulated VAI conditions. Implications and future directions to examine effect of visual impairment on BCI use is discussed. |
| Databáze: | OpenAIRE |
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