Brain-computer interface and visual perception

• Main Author: Cheoh, Xin Mei
• Other Authors: Deepu Rajan
• Format: Final Year Project
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Computer science and engineering::Computer applications
• Online Access: http://hdl.handle.net/10356/62650
• Institution: Nanyang Technological University

There has been an increasing amount of research and development done in the field of brain-computer interface (BCI) technology. Both the generation of visual images and the perception of the actual images activate practically the same brain centres. Hence, the research on examining the efficacy of the classification of brain signals based on two different categories of images (faces and houses) is of significance because it helps to address BCI-related issues that concern with the trigger of brain centres during imagination. The purpose of the project is to recognise electroencephalography (EEG) patterns according to the types of images that the subject is supposed to visualise. The experiments were conducted using the Emotiv EPOC headset, and VisualX, a software developed for the study. The Bayesian approach was implemented to evaluate the results, and it was determined that EEG artifacts would not have a substantial effect on the outcome. It was discovered that the overall classification accuracy of the study was 47%. In order to enhance the classification quality, the number of images to imagine in the training and test phases could be increase, so that additional input would be accessible for analysis. Moreover, it seemed plausible to examine not only the images of faces and houses, but also other types of visual images. It was recommended that alternative classifiers could be further explored to attain a higher precision during the classification process.