Exploring the impact of stimulus transparency in ERP-BCI under RSVP
Authors: 
Álvaro Fernández-Rodríguez, Chloé Álvarez, Celia Langin, Francisco Velasco-Álvarez, Theodore Letouze, Jean-Marc Andre, Ricardo Ron-AngevinAuthors Info & Claims
Pages 9 - 14
Abstract
Rapid serial visual presentation (RSVP) is currently one of the most suitable paradigms for implementing a visual brain–computer interface based on event-related potentials (ERP-BCI) for patients with limited ocular motility. This paradigm presents stimuli centered in the user’s field of vision, which may hinder the patient from attending to other elements on the screen. A potential solution to this could be the use of semi-transparent stimuli, allowing both the stimulus and the background to be perceived. Therefore, the objective of this study is to evaluate the impact of stimulus transparency on ERP-BCI performance under the RSVP paradigm. Five participants tested the ERP-BCI under RSVP using three different stimulus transparencies with alpha channels set to 255 (C1), 85 (C2), and 28 (C3). The results showed the following average BCI classification accuracies: C1, 70%; C2, 74.67%; and C3, 60.67%. Although the analyses did not reveal significant differences, the results suggest that the transparency level should be carefully manipulated to maintain a balance between stimulus transparency and performance, with C2 even exhibiting the highest accuracy among the conditions. This finding should be considered by future ERP-BCI proposals aimed at users who need gaze-independent systems.
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June 2024
708 pages
ISBN:9798400717604
DOI:10.1145/3652037
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Published: 26 June 2024
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PETRA '24
PETRA '24: The PErvasive Technologies Related to Assistive Environments Conference
June 26 - 28, 2024
Crete, Greece
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