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The Efect of Stress on Brain Connectivity in Experiments Related to Different Tasks

Azimi, Motahareh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57055 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shamsollahi, Mohammad Bagher
  7. Abstract:
  8. Stress is an integral aspect of human experiences, manifesting in various situations such as tension, anxiety, and specific diseases. Researchers globally are exploring innovative approaches to control stress, aiming to quantify and detect it. The quantification of stress levels using brain signals is a prominent focus in the field of medical engineering.In most studies, the classification objective revolves around two classes (stress-relaxation) or three classes (stress levels). Typically, these studies employ databases inducing stress and recording brain signals uniformly. While various stress induction methods have been used, the resulting brain connections are less discussed.This project has two defined goals. Firstly, it classifies two classes (presence of stress and absence of stress) using features based on brain connectivity across different stress induction methods. Then, by utilizing functional connectivity graphs for different frequency bands separately, it examines and compares two groups (subjects with induced and uninduced stress) through statistical tests.The iCOH feature stands out as the best in functional connectivity, achieving an accuracy of about 99% across all three tasks. Similarly, the Granger feature excels in effective communication, with an accuracy of about 96%. Finally, the comparison of functional connectivity graphs reveals stress effects on the right and front of the head. Statistical tests on beta band for all subjects demonstrate a significant differentiation between the two groups (presence of stress and absence of stress) with a P-value < 0.05
  9. Keywords:
  10. Stress ; Electroencephalography ; Machine Learning ; Classification ; Brain Connectivity ; Anxiety ; Brain Waves

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