Decoding mental states in bistable perception by using source based wavelet features

Susmita Sen, Katsumi Watanabe, Joydeep Bhattacharya, Goutam Saha

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This work presents an efficient application of machine learning and signal processing algorithms in decoding the mental states from brain signals. We decoded two internal mental states, transition and maintenance, representing the process of switching and maintaining a perception in bistable perception, respectively. The underlying sources were reconstructed from the Magnetoencephalogram (MEG) signals recorded from human participants while they were presented with six different conditions of bistable stimuli. We extracted features using complex Morlet wavelet transform that captured the temporal dynamics of large scale brain oscillations in the source domain. The mental states were predicted on a trial-by-Trial basis using Support Vector Machine (SVM) and Artificial Neural Network (ANN) classifiers along with Fisher's ratio based feature selection technique. We achieved accuracies of 75.65% and 74.58% using SVM and ANN classifier, respectively. The analysis also exhibits the involvement of the sources of parietal, temporal and cerebellum areas in characterizing the two mental processes.

Original languageEnglish
Title of host publication2017 IEEE Calcutta Conference, CALCON 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781538637456
Publication statusPublished - 2018 Feb 2
Event2017 IEEE Calcutta Conference, CALCON 2017 - Kolkata, India
Duration: 2017 Dec 22017 Dec 3

Publication series

Name2017 IEEE Calcutta Conference, CALCON 2017 - Proceedings


Other2017 IEEE Calcutta Conference, CALCON 2017


  • ANN
  • Bistable Perception
  • Decoding
  • MEG
  • SVM
  • Single-Trial Classification
  • Source Reconstruction

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Control and Optimization


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