2026-05-31T17:45:40Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/320682026-02-03T12:26:59Zcom_10630_2254col_10630_37959

Exploring the impact of stimulus transparency in ERP-BCI under RSVP. Fernández-Rodríguez, Álvaro Velasco-Álvarez, Francisco Javier Alvarez, Chloé Langin, Célia Letouzé, Théodore André, Jean-Marc Ron-Angevin, Ricardo Interfaces cerebro-ordenador 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. 2024-07-11T11:43:36Z 2024-07-11T11:43:36Z 2024-07-11T11:43:36Z 2024 conference output Álvaro Fernández-Rodríguez, Chloé Álvarez, Celia Langin, Francisco Velasco-Álvarez, Theodore Letouze, Jean-Marc Andre, and Ricardo Ron-Angevin. 2024. Exploring the impact of stimulus transparency in ERP-BCI under RSVP. In Proceedings of the 17th International Conference on PErvasive Technologies Related to Assistive Environments (PETRA '24). Association for Computing Machinery, New York, NY, USA, 9–14. https://doi.org/10.1145/3652037.3652045 https://hdl.handle.net/10630/32068 eng The PErvasive Technologies Related to Assistive Environments (PETRA) 2024 Creta, Grecia 26/6/2024 open access ACM Library Digital