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Differences of the Brain’s Surprise Response Due to the Habituation Effect in Neurodegenerative Patients and Healthy People

Hosseinpour Khaledian, Kamyab | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56678 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Karbalaei Aghajan, Hamid
  7. Abstract:
  8. The brain is constantly placed in stochastic environments. This leads to the brain developing a probabilistic model for the environment. However, sometimes unexpected events occur that lead to surprise and a need for updating the probabilistic model. It can be concluded from this argument that reduction in brian’s surprise is a sign of learning. On the other hand, a probability distribution obtained from a probabilistic model contains an amount of uncertainty. Reducing this uncertainty can also be considered a sign of learning. Surprise and uncertainty can be obtained from a probability distribution using information theory concepts. Another important issue in learning is habituation, which is defined as the decrease in response of the brain to repeated stimuli. In this research, we consider the habituation of the brain’s a response in terms of complexity of electroencephalography (EEG) data. Several algorithms have been used to measure the complexity of brain activity in EEG datd. We employ two well-known algorithms, namely the Lempel-Ziv complexity and Sample entropy. Then, by examining the differences in the complexity of responses recorded from Parkinson's patients on and off medication and healthy individuals, we discuss the mechanisms involved in habituation.
  9. Keywords:
  10. Uncertainty ; Parkinson Disease ; Surprise ; Complexity ; Electroencephalography ; Habituation Process

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