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Effect of Reward Training on the Object-Finding Skill in Human

Askari, Zahra | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55516 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Vosoughi Vahdat, Bijan; Ghazazideh, Ali
  7. Abstract:
  8. The speed of finding things in humans and animals is essential; Because human is surrounded by many things, but only a tiny number of them are important to them. Animals also need to recognize valuable objects for their survival quickly, but searching for an object surrounded by many other things is a complex and time-consuming task. Therefore, understanding how search operations can increase the speed can be helpful and improve the accuracy and efficiency of common and essential searches in the community, from screening to understanding medical images.Also, the human brain can identify and prioritize valuable stimuli and keep them in mind, so until now, researchers in the field of neuroscience, by designed different experiments in the area of visual search and search based on reward learning to understand the rules governing search operations, have tried and shown that searching for high-value objects in macaques is done efficiently. In this research, we also examine this hypothesis in humans; In this way, we taught 16 human subjects some complex objects along with small or large rewards in one-day and four-day periods, and then we checked their search for high-value objects.Following the hypothesis, we observed that high-value objects were found with high accuracy and speed. As a result of more extended object value training, the dependence on search time and the number of saccades required to find high-value objects were reduced, and efficient search was improved. (Reduced from 100 ms per object to 40 ms per object).And we also answered some research questions, including the following: What effect does reward history have on search performance in the presence of distractors? How quickly and accurately does our attention reach the valuable object? How does long-term learning affect search time (speed), detection of the good object (accuracy), and the number of saccades? How does the display size (the number of distractors on the display) affect the accuracy and speed of the search? What effect does familiarity with objects have on searching for them?
  9. Keywords:
  10. Value-Based Learning ; Visual Search ; Object's Value ; Visual Guiding Features ; Reward Training

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