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Effect of Reward Training on Visual Representation of Objects in the Brain

Sharifi, Kiomars | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54843 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ghazizadeh, Ali
  7. Abstract:
  8. Sight is probably our most important sense. Every day, humans are exposed to many visual stimuli in their surroundings. The human brain is able to identify and prioritize important and valuable stimuli and memorize them. Identifying and remembering these valuable stimuli is vital to meeting the needs and maintaining survival. The aim of the proposed research is to find the effect of reward learning on the coding of visual objects in the human brain. Previous results have shown that long-term reward-object association make valuable objects more recognizable behaviorally. Studies have also shown that visual stimuli and the pattern of activity of primary visual cortex neurons are closely related. It is assumed that beside association, one of the mechanisms leads to the rapid detection of valuable objects is the changes in representation and coding of visual objects in the primary visual cortex. In the field of neuroscience, various models have been developed to answer how visual stimuli are encoded by primary visual cortex neurons and how stimuli can be reconstructed from neuronal activity.With advances in functional magnetic resonance imaging, there have been many successes in this area. Due to the large amount of information that fMRI imaging provides from neuronal activity; it enables a good opportunity to use deep neural networks to reconstruct images from fMRI data. With recent rapid advances in deep learning, it is hoped that image reconstruction can be performed with good accuracy.Reconstruction of visual stimuli seems to provide a good estimate of the subject's perceptual experience. The question is whether the reward learning process alters the activity of the primary visual cortex neurons and the subject's perceptual experience. For this purpose, reconstructed images should be compared before and after the reward learning process.
  9. Keywords:
  10. Visual Cortex ; Functional Magnetic Resonance Imaging (FMRI) ; Reward Training ; Visual Image Reconstruction ; Early Visual Cortex

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