Towards a symbiotic brain-computer interface: exploring the application-decoder interaction.

Abstract:

OBJECTIVE:State of the art brain-computer interface (BCI) research focuses on improving individual components such as the application or the decoder that converts the user's brain activity to control signals. In this study, we investigate the interaction between these components in the P300 speller, a BCI for communication. We introduce a synergistic approach in which the stimulus presentation sequence is modified to enhance the machine learning decoding. In this way we aim for an improved overall BCI performance. APPROACH:First, a new stimulus presentation paradigm is introduced which provides us flexibility in tuning the sequence of visual stimuli presented to the user. Next, an experimental setup in which this paradigm is compared to other paradigms uncovers the underlying mechanism of the interdependence between the application and the performance of the decoder. MAIN RESULTS:Extensive analysis of the experimental results reveals the changing requirements of the decoder concerning the data recorded during the spelling session. When few data is recorded, the balance in the number of target and non-target stimuli shown to the user is more important than the signal-to-noise rate (SNR) of the recorded response signals. Only when more data has been collected, the SNR becomes the dominant factor. SIGNIFICANCE:For BCIs in general, knowing the dominant factor that affects the decoder performance and being able to respond to it is of utmost importance to improve system performance. For the P300 speller, the proposed tunable paradigm offers the possibility to tune the application to the decoder's needs at any time and, as such, fully exploit this application-decoder interaction.

journal_name

J Neural Eng

authors

Verhoeven T,Buteneers P,Wiersema JR,Dambre J,Kindermans PJ

doi

10.1088/1741-2560/12/6/066027

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

066027

issue

6

eissn

1741-2560

issn

1741-2552

journal_volume

12

pub_type

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