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Interpolation

Project name

Interpolation

Type of product

research and creation.

Principal Investigator

Héctor Fabio Torres

Participating groups

Entorno Sonoro y Visual.

Topic

BCMI prototype, Brain-Computer Music Interface for musical creation.

Methodology

The prototype proposes a neurofeedback model through four specialized speakers to reproduce three-dimensional panels according to the navigation of the GUI.

The user is placed in the center of the speakers in front of a screen: he/she may be able to move and transform the cursor at will, as well as stop the movement through a state of relaxation, allowing the system to return to a neutral state.

The experimental equipment used in this experiment was an OpenBCI for EEG signal acquisition, a screen for GUI display, two cameras, one for facial recording of the participants and the second for general recording of the experiment. It was also necessary to use two computers, one for signal acquisition and pattern recognition processing, and the second for Max/MSP processing, and a quadraphonic audio system for sound immersion.

Summary of the project

Brain state control has been well established in the area of brain-computer interfaces over the last decades where active applications allow to control external devices in a conscious way. The purpose of this study was to develop a real-time graphical sound representation system based on an interaction design that allows navigating the cognitive task of motor imagery in a two-dimensional plane.

This representation was developed using the OpenBCI EEG acquisition system to record the necessary information that was sent to and processed in the Max/MSP software. The system operates under a metaphorical Graphical User Interface (GUI) programmed in Processing.

The system was tested through an experiment under controlled conditions involving six professional musicians. From the experimental results, it was found that all participants achieved different levels of control associated with their static and dynamic response with an average of 26.73% and 73.27% respectively.