Evaluation of flashing stimuli shape and colour heterogeneity using a P300 brain-computer interface speller
| Autor: | M. Teresa Medina-Juliá, Francisco Velasco-Álvarez, Ricardo Ron-Angevin, Álvaro Fernández-Rodríguez |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
FOS: Computer and information sciences Male genetic structures Computer science Computer Science - Human-Computer Interaction Stimulus (physiology) Human-Computer Interaction (cs.HC) 03 medical and health sciences Young Adult 0302 clinical medicine Humans Brain–computer interface business.industry General Neuroscience 92C55 Pattern recognition Electroencephalography Flashing Event-Related Potentials P300 Form Perception 030104 developmental biology Brain-Computer Interfaces Female Artificial intelligence business 030217 neurology & neurosurgery Color Perception Photic Stimulation Psychomotor Performance |
| Zdroj: | Neuroscience letters. 709 |
| ISSN: | 1872-7972 |
| Popis: | Previous works using a visual P300-based speller have reported an improvement modifying the shape or colour of the presented stimulus. However, the effects of both blended factors have not been yet studied. Thus, the aim of the present work was to study both factors and assess the interaction between them. Fifteen naive participants tested four different spellers in a calibration and online task. All spellers were similar except the employed illumination of the target stimulus: white letters, white blocks, coloured letters, and coloured blocks. Regarding the results, the block-shaped conditions offered an improvement versus the letter-shaped conditions in the calibration (accuracy) and online (accuracy and correct commands per minute) tasks. The analysis of the event-related potential waveforms showed a larger difference between target and no target stimuli waveforms for the block-shaped conditions versus the letter-shaped. The hypothesis regarding the colour heterogeneity of the stimuli was not found at any level of the analysis. Therefore, this first study combining block-shaped and colour factors, and offering an exhaustive evaluation of both, demonstrated the superiority of block-shaped illumination versus the standard letter-shaped flashing stimuli in classification performance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect