A Visual Stimulus Module for P300 Based Brain Computer Interfaces

Year 2016, Special Issue (2016), 128 - 132, 01.12.2016

Eda Akman Aydın , İnan Güler

Abstract

Brain Computer Interfaces (BCIs) are the systems that provide a direct
communication channel between human brain and environment. P300 potentials are
involuntary brain responses which are used to control BCI systems. In order to
elicit P300 responses, stimulus presentation must be provided to the users.
However, there are not common paradigms
or optimal parameters for all BCI users, or all BCI applications. Using the
most convenient method and parameters for each user individually will improve
system performance. This study proposes a visual stimulus module for P300 based BCIs. The
module offers to design stimulus interfaces based on three different stimulus
interfaces, including row/column, single character and region based paradigms.
The module also provides customization of the stimulus interface by setting
optimal parameters for individuals practically. Furthermore, in this study, we
also explained synchronization between stimulus interface and data acquisition
module in detailed. In order to test the stimulus module, stimulus interfaces
based on three visual stimulus paradigms were designed. All the paradigms were
tested by three subjects. P300 responses yielded with three paradigms were
compared by using one-way statistical analysis of variance (ANOVA) method.
Preliminary results revealed that average amplitude and latency of P300
potentials that were elicited by the different paradigms may differ.

Keywords

Brain Computer Interface (BCI), P300 Potentials, Region Based Paradigm, Row/Column Paradigm, Single Character Paradigm, Visual Stimulus Module

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