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Non-event Related Tinnitus Assessment Using EEG Time-frequency Analyses

Dabouei, Ali | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49089 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Jahed, Mehran; Mahmoudian, Saeed
  7. Abstract:
  8. Tinnitus is a perception of sound in the absence of an external source. Tinnitus is commonly associated with the hearing system and the sound perception areas in brain. Subjective tinnitus etiology has not been fully understood. Recent researches introduce some theories by means of finding structural differences in brain of tinnitus patients in comparison to normal people. In most previous researches on finding correlations of tinnitus in EEG signals, processes has been performed in time or frequency domain. According to these evidence and great performance of time-frequency analyses tools, especially wavelets in processing non-stationary signals, we utilized wavelet packets to decompose EEG signal to main EEG bands, Delta, Theta, Alpha, Beta and Gamma. All bands energy analyzed according to recording paradigm and acoustic stimulations. The main imperfection of previous researches was comparing features extracted from EEG signals of tinnitus patients and normal cases. In this research a method introduced to enhance comparison reliability by comparing EEG signal from patients before and after acoustic treatment stimulation. Acoustic treatment stimulation enabled us to compare EEG signal of a tinnitus patient in normal tinnitus and suppressed tinnitus conditions. To confirm treatment aspects of acoustic stimulation, a placebo stimulation was used before treatment stimulation. During recording paradigm, six visual analog scale questionnaires conducted from patients to assess subjective severity of tinnitus in different stimulation steps. Results showed a great energy decrease in Delta band and the energy increased after suppression process. Alpha, Beta and Gamma bands also showed energy decrease and only Theta band had no changes. These results may contribute to introduce more effective treatments for tinnitus patients
  9. Keywords:
  10. Electroencphalogram ; Time-Frequency Analysis ; Wavelet Analysis ; Subjective Tinnitus ; Tinnitus

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