https://drive.google.com/file/d/13UA3UE0ggU7_UU62Jt_gs-8Rp8D4BY1p/view?usp=sharing

[Encoding 8 Directions of Mouse Movement Using BCI]

Tran Nguyen Thuy Trang (11 TN1) - High School for the Gifted - VNU HCMC

Abstract: The objective of this project is to develop a Brain-Computer Interface (BCI) system capable of controlling a computer mouse pointer in 8 directions (up, down, left, right, and the 4 diagonals) using sensorimotor rhythms (SMR) derived from electroencephalographic (EEG) signals. The system combines motor imagery (MI) tasks with advanced signal processing and classification techniques to accurately decode user intentions. This approach leverages the power of P300 and Event-Related Desynchronization (ERD) signals to enhance the accuracy and reliability of the BCI, providing a robust solution for individuals with disabilities to interact with computers.

I. Approach

To encode 8 directions of movement (up, down, left, right, and the 4 diagonals) for the mouse pointer using a Brain-Computer Interface (BCI) based on sensorimotor rhythms (SMR), I propose a solution that leverages motor imagery (MI) combined with advanced signal processing and classification techniques.

This approach is chosen because combining various motor imagery tasks with sophisticated classification methods enhances the accuracy and resolution of the BCI system. This expanded capability for controlling the mouse pointer in a 2D space meets practical user requirements, especially for individuals with disabilities.

II. Methodology for Analyzing, Classifying, and Processing the Encoded Signals

1.Utilizing Motor Imagery and P300 Signals

P300 signals and Event-Related Desynchronization (ERD) are commonly used EEG signals in BCI systems. Combining these signals can improve the accuracy of distinguishing different mental commands.

a.P300 Signals

P300 is an EEG signal that appears approximately 300ms after the user perceives a specific stimulus. It can be used to differentiate between various events based on the brain's response.

b.Event-Related Desynchronization (ERD)

ERD refers to a reduction in alpha or beta wave activity in the brain when the user imagines or performs a motor task.

2. Combining Motor Imagery with P300 Signals

a.Motor Imagery Tasks

To encode 8 directions, I propose using 4 basic motor imagery tasks and combining them with P300 signals: Right-hand grasp, Left-hand grasp, Right toe curl, Left toe curl

b.Encoding Directions

By combining motor imagery tasks with P300 signals, we can encode the following 8 directions:

●Up: P300 + Right-hand grasp