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Evaluation of Innovative SSVEP Stimulation Patterns for Neuro-Ophthalmology

Stock, Simon; Gerdes, Marius; Schinle, Markus; Veloso de Oliveira, Julia; Hauptmann, Lars; Martini, Lucas; Stork, Wilhelm

Purpose: Steady-State Visually Evoked Potentials (SSVEPs) are the brain's response to periodical optical stimuli. They are great for analyzing and investigating the function of the whole visual system. No conscious patient feedback is required. We looked at variations of conventional checkerboard patterns to determine how onset/reversal, superimposed noise, or pictures of faces can improve the elicited signals' magnitude. The resulting comparisons may be used to improve existing SSVEP-based procedures using novel types of stimuli.
Methods: Using our custom system, we designed two stimuli sets. Set 1 using checker and faces (7s) and set 2 using dartboard, checker, and faces (6s), both at 7.5Hz. The sets were shown to two groups of 5 participants each (age: 20-30). The resulting reactions to the SSVEP were recorded using an 8-channel EEG (500 Hz) with electrodes positioned on the occiput [P07,O1,Oz,O2,P08,P03,P04,Fz]. The data was analyzed using the Canonical Correlation Analysis (CCA) calculated over the stimulation window using the stimulation frequency and harmonics. Plots represent the mean value of all subjects in the set for the CCA.
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Zugehörige Institution(en) am KIT Institut für Technik der Informationsverarbeitung (ITIV)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2021
Sprache Englisch
Identifikator ISSN: 0146-0404, 1552-5783
KITopen-ID: 1000139990
Erschienen in Investigative Ophthalmology & Visual Science
Verlag Association for Research in Vision and Ophthalmology (ARVO)
Band 62
Heft 8
Seiten 2391–2391
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