Investigation of the Effects of Two and Three Dimensional Paradigms on Event-Related Potentials Using Wavelet Transform Based Method

Abstract

In event-related P300 potential-based Brain Computer Interface (BCI) systems, the main focus of the studies is how different stimulus types affect system performance. In a study, a data set was created using classical two-dimensional row-column flashing-based and proposed three-dimensional column flashing-based paradigms. According to the results obtained, the proposed three-dimensional column flashing shows high performance in terms of classification accuracy of stimulus presentation. However, how this paradigm changes the P300 potential has not been demonstrated. In this study, the effect of both paradigms on the event-related P300 potential is discussed using a wavelet transform-based method in terms of both time and frequency space. According to the results obtained, it was observed that the proposed paradigm activated more frequency bands on the P300 potential. In addition, using the proposed method, higher P300 amplitude was obtained in many channels. As a result, more effective P300 signals are received in stimulus presentation using the proposed paradigm, increasing the BCI system performance.

Keywords

• Wavelet transform
• P300
• BCI
• EEG

İki ve Üç Boyutlu Paradigmaların Olay İlişkili P300 Potansiyeli Üzerindeki Etkilerinin Dalgacık Dönüşümü Esaslı İncelenmesi

Öz

Olay ilişkili P300 potansiyeli tabanlı Beyin Bilgisayar Arayüzü (BBA) sistemlerinde genellikle farklı uyaran tiplerinin sistem performansını nasıl etkilediği yapılan çalışmaların ana odak noktasıdır. Literatürde yapılan bir çalışmada klasik iki boyutlu satır-sütun ve önerilen üç boyutlu sütun flaşlanması esaslı paradigmalar kullanılarak veri seti oluşturulmuştur. Elde edilen sonuçlara göre önerilen üç boyutlu sütun flaşlanması esaslı uyaran sunumu sınıflandırma doğruluğu açısından yüksek performans göstermektedir. Ancak bu paradigmanın P300 potansiyeli üzerinde nasıl bir değişim meydana getirdiği gösterilmemiştir. Yapılan bu çalışmada dalgacık dönüşümü esaslı bir yöntem kullanılarak her iki paradigmanın olay ilişkili P300 potansiyeli üzerindeki etkisi hem zaman hem de frekans uzayı açısından ele alınmıştır. Elde edilen sonuçlara göre, önerilen paradigmanın P300 potansiyeli üzerinde daha fazla frekans bandında aktivasyon meydana getirdiği görülmüştür. Ayrıca yine önerilen yöntem kullanılarak birçok kanalda daha yüksek P300 genliği elde edilmiştir. Sonuç olarak, önerilen paradigma kullanılarak gerçekleştirilen uyaran sunumunda daha etkin P300 sinyalleri elde edilmekte, buda BBA sistem performansını artırmaktadır.

Anahtar Kelimeler

• Dalgacık dönüşümü
• P300
• BBA
• EEG

Kaynakça

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