 여러분이 행복하거나, 20년을 행복하거나, 모든 날 we work hard every day and we prepare a lot of plans. 사실 problem is that we don't know much about what is happiness. I am going to talk about how the brain generates happy feelings. I feel happy whenever I receive a small gift. You may remember that you gave a marriage ring to your partner on a special day. 저의 사이니스토리에 참여하자마자 어린 아이템이 어떻게 될까요? 그룹의 주인, 윈우아 브레일을 주지요. 그게 문제입니다. Not only humans, animals also utilize these kinds of items to attract females. For example, male-power birds try to gather those kinds of even human-made items, plastic-cap, transistors to attract females. If you give attachment to the zebra pinches, female shows a greater preference. Based on this fact, I made a hypothesis. Probably, three-dimensional objects induce happy feelings in our brain. It may explain why portrait has evolved toward increasing tridentness and why we get excited to watch a 3D movie or art. Let me give you some evidence. My dog, maybe your dog, loves toys very much. Basically, toys are three-dimensional objects. However, these dogs do not respond to objects reflected on the mirror. Two-dimensional signs. You can prove this idea in red. If you give a three-dimensional cube, red brings it and plays with it. They like it very much. Compared to three-dimensional objects, however, these reds do not respond well to two-dimensional objects, regardless of color or size. So just say, among many pictures of objects, the three-dimensional is a critical factor. This attraction to three-dimensional seems to be in bone mechanism because many young animals love to play with noble objects. Also, they never seen before. You may have experienced that your children tried to get new toys, a toy store, even without making payment, okay? So, another hint comes from neurological condition called compulsive holding disorders. These people called hoarders keep items but never throw them away. Andy Warhol, a famous modern artist, was a hoarder. This is the reason why he believed that every item in your home can be an art. You can see many kinds of holding behavior around you. This is my graduate student. She tried to keep a lot of object and items on her desk. Let me show you another example. This is my office. So, showing that I have also holding behavior. Usually, yeah, I walk outside. So, what is the biological meaning of this kind of object keeping behavior, object holding behavior? It is interesting to note that all foods are actually three-dimensional objects. So, this kind of mechanism may help animals try to keep as much food as possible in nature. This is very useful for their survival because foods are now already plentiful. You can prove this side in mouse. If you give a small food pellet to hungry mice, they take it and eat it, okay? It is not surprising. But even after it is full, they try to gather more food pellets without eating. This is exactly food holding behavior. So, I'm studying about food holding behavior in mice. What is the brain mechanism? Wild type mice show really careful approach to object. However, mutant mice lacking a titi calcium channel expressed in the brain, they show really active engagement, aggressive engagement with those kind of objects. By comparing these two mice, showing different responsiveness to objects, you can identify which brain area involved in object holding behavior. We found that many different brain areas is activated during active engagement with objects. By stimulating one by one, eventually you could find the critical neural circuit. By modulating this object craving circuit, you could modulate people or animal to be really exaggerated and satisfied with a simple item, like a cotton stick, okay? This kind of satisfaction with what we already have is really critical for being happy. Finally, the brain generate attraction to readiness. This mechanism could explain why we feel happy when we have enough food or resources. Using this analogy, sometime we could modulate the human greed or happiness in your future. So, I'd like to discuss with you regarding what is the pros and cons if we control this brain mechanism, the happiness or greed. Thank you for your attention.