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Investigation the Relationship between Human Visual Brain Activity and Emotions
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Όλ¬Έ(μμ¬)--μμΈλνκ΅ λνμ :곡과λν μ»΄ν¨ν°κ³΅νλΆ,2019. 8. κΉκ±΄ν¬.μΈμ½λ© λͺ¨λΈμ μκ·ΉμΌλ‘λΆν° μ΄λ°λ λ νλμ μμΈ‘νκ³ , λκ° μ 보λ₯Ό μ΄λ» κ² μ²λ¦¬νλμ§ λΆμνκΈ° μν΄ μ¬μ©λλ€.λ°λ©΄ λμ½λ© λͺ¨λΈμ λ νλμΌλ‘λΆν° μκ·Ήμ λν μ 보λ₯Ό μμΈ‘νκ³ , νμ¬ νΉμ μκ·Ήμ΄ μ‘΄μ¬νλμ§λ₯Ό νλ¨νλ κ² μ λͺ©νλ‘ νλ€. λ λͺ¨λΈμ μ’
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λ€μ΄ 무μμλ‘ μμ¬ μλ μκ·ΉμΌ λ‘λΆν° μ λλ μκ° μ²΄κ³μ νλμΌλ‘λΆν°λ κ°μ κ°μ μ 보λ₯Ό μΆμΆν΄λΌ μ μλ€λ κ²μ΄ μλ €μ Έ μλ€ [20]. μ΄λ° μ°κ΅¬λ€μ κ³ λ €νμ¬, μ°λ¦¬λ μκ° μ²΄κ³κ° μ΄λ μμ€κΉμ§ κ°μ μ 보λ₯Ό λ΄κ³ μλμ§ νꡬνλ€. μ°λ¦¬λ μΈμ½λ© λͺ¨λΈμ μ¬ μ©νμ¬ μμ/μ€μ/νμ μκ° νΉμ±(feature)κ³Ό κ°κ° κ΄λ ¨μ΄ μλ λ μμμ μ ννκ³ , μ΄ λ μμλ€λ‘λΆν° κ°μ μ 보λ₯Ό λμ½λ© νλ€. μ°λ¦¬λ νλμ½λΏλ§ μλλΌ μμμ λνΌμ§κΉμ§ μ΄μ΄μ§λ μμλ€μ΄ μ΄λ° νΉμ±λ€μ μΈμ½λ© νκ³ μ λ€λ κ²μ λ°νλ€. λ€λ₯Έ λ μμλ€κ³Ό λ¨μν CNN νΉμ±λ€κ³Όλ λ¬λ¦¬, μ΄λ¬ν λ μμλ€λ‘λΆν°λ κ°μ μ 보λ₯Ό λμ½λ© ν μ μμλ€. μ΄ κ²°κ³Όλ€μ μμ/ μ€μ/νμ μκ° νΉμ±λ€μ μΈμ½λ© νκ³ μλ λ μμλ€μ΄ μμ λ°νμ§ κ°μ μ 보 λμ½λ©κ³Ό κ΄λ ¨μ΄ μμμ 보μ¬μ£Όλ©°, λ°λΌμ νλμ½κ³Ό κ΄λ ¨λ κ°μ μ 보 λμ½λ© μ±λ₯μ μκ°κ³Ό κ΄λ ¨ μλ μ 보 μ²λ¦¬μ κΈ°μΈνλ€.Encoding models predict brain activity elicited by stimuli and are used to investigate how information is processed in the brain. Whereas decod- ing models predict information about the stimuli using brain activity and aim to identify whether such information is present. Both models are of- ten used in conjunction. The brains visual system has shown to decode stimuli related emotional information [15, 20]. However brain activity in the visual system induced by the same visual stimuli but scrambled, has also been able to decode the same emotional information [20]. Consid- ering these results, we raise the question to what extent encoded visual information also encodes emotional information. We use encoding models to select brain regions related to low-, mid- and high- level visual features and use these brain regions to decode related emotional information. We found that these features are encoded not only in the occipital lobe, but also in later regions extending to the orbito-frontal cortex. Said brain re- gions were not able to decode emotion information, whereas other brain regions and plain CNN features were. These results show that brain re- gions encoding low-, mid- and high- level visual features are not related to the previously found emotional decoding performance and thus, the decoding performance related to the occipital lobe should be contributed to non-vision related processing.Chapter 1 Introduction 1
Chapter 2 Background 4
2.1 Emotions and the Visual System 4
2.1.1 Visualsystem 4
2.1.2 Emotions 6
2.2 functional Magnetic Resonance Imaging 7
2.2.1 BOLDsignal 8
2.2.2 Analysis of fMRI 9
2.2.3 EncodingModel 10
2.2.4 DecodingModel 11
2.3 RelatedWork 13
Chapter 3 Materials & Methods 17
3.1 Experimental data 18
3.2 Encoding model 19
3.3 Decoding Model 22
Chapter 4 Results 24
4.1 Encoding 24
4.2 Decoding 28
Chapter 5 Discussion and Limitations 31
5.1 Encoding 31
5.2 Decoding 33
5.3 Limitations and Feature Directions 35
Chapter 6 Conclusion 37
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