・The brain is similar to muscles; both the brain and muscles can be trained and enlarged by training, but the two are very different in the following 2 points: 1) muscles deflate as soon as training is interrupted, but the brain is maintained to some extent even when training is stopped, 2) muscles age the fastest because they are body tissues, and conversely, the brain is the hardest organ to age (p1)
・Brain cells decrease from around age 10, but the opposite is actually true; in fact, they are refining their function “while removing unnecessary things.” In order to quickly utilize necessary information, the task necessary to maintain high brain function is to reduce brain cells (p2)
・It is said that there are 100 billion brain cells in the human brain, and they are decreasing by 100,000 every day, and it takes 2740 years to disappear, so there is no point in fearing that brain cells will decrease (p3)
・The accumulation of lack of sleep does not lead to Alzheimer's dementia, and there is a possibility that sleep disorder appears as an early symptom of dementia, and the causal relationship is opposite (p26)
・Since the brain is an “activity mode organ” newly added due to evolution to a body with “rest mode by default,” there is no need to necessarily let it rest. Sleep is an “efficient energy management system for the entire body” rather than for the brain, and the brain continues to be active 24 hours a day while monitoring the body's sleep like a nursery teacher (p30)
・Doki Doki is an increase in heart rate, and this is definitely a stimulus; the cerebral cortex counts the upper and lower heart rate, which affects the sense of time. In the case of the elderly, if they don't feel excited due to chronic lack of stimulation, it means “if you're dazed, it's been a longer time than you thought, and the day will end soon” (p39)
・When your heart rate rises and you're excited, the time your brain feels is longer than it actually is, making it easier to process a lot of information. The theory is that it's exciting → the brain is in an awake state → it becomes easier to process a lot of information. Time is not equal, and a lot can be given to people who are excited (p40)
・The brain is an “organ created to process stimuli,” the brain becomes obsolete due to lack of stimulation, it is not forced to be active 24 hours a day, and not resting is the optimal way for the brain to work (p54)
・Medically “getting used to it” means genes are applied (p64)
・Regarding the relationship between concentration and sleep, concentration does not improve when you sleep a lot, but it is more accurate to say “sleeping a lot makes brain commands during wakefulness go smoother,” in other words, when not sleeping, the brain spends energy “resting the body,” so other commands such as thinking and moving the body are neglected by that amount (p71)
・Forgetting is an important function of the brain, and forgetting makes it easier for people to quickly retrieve important information (p87)
・The brain is special, and while other organs “acquire function by increasing,” it is an organ that “acquires function by scraping it down” (p89)
・The organ called the brain doesn't require much rest to shut out stimuli, and more than that, putting in various appropriate stimuli, such as exercising, memorizing language, listening to music, etc. (p100)
・ Walnuts are rich in omega-3 fatty acids and are a material for nerve cell membranes and synapses. Furthermore, there is also a theory that it is rich in antioxidants and polyphenols, suppresses brain inflammation, and is good for memory and learning function (p128)
・The effect of learning a second language is not only being able to speak a foreign language, but it also prevents dementia, and even when brain function is lost due to a stroke, etc., functional recovery is accelerated by a cognitive reserve brain, and it is possible to train a brain that is resistant to damage (p129) It is known that just by continuing light language learning for about 1 hour 3 times a week for 3 months, the structure of the brain physically changes, so if you want to build a strong brain that doesn't want to get dementia, let's learn languages ( p135)