What are some amazing facts about the brain? What do these facts reveal about our minds?<\/p>\n\n\n\n
In Seven and a Half Lessons About the Brain<\/em>, Lisa Feldman Barrett provides facts about the brain that help us understand our control center even better. By understanding how our brain operates, you can take a more active role in deciding how to think and behave.<\/p>\n\n\n\n Let’s look at these facts about the brain that Barrett provides.<\/p>\n\n\n\n\n\n\n\n The first amazing fact about the brain debunks a common misconception. Barrett argues that the way we traditionally think of the human brain is based on outdated research. There\u2019s a<\/strong> popular belief that the human brain has three distinct parts, each with distinct functions<\/strong>: a brain core (or \u201clizard brain\u201d), a limbic system<\/a>, and a neocortex. <\/strong>The three-layer model of the brain has long been used as \u201cproof\u201d that the human brain is more evolved than other animal brains. <\/p>\n\n\n\n This model became popular in the mid-20th century when doctor Paul MacLean identified structural similarities and differences among the brains of different animals:<\/p>\n\n\n\n Barrett says that researchers debunked this model in the late 20th century<\/strong>, yet the general public still believes it to be true.<\/p>\n\n\n\n The problem is that this model relies on what brains look like <\/em>to deduce what they can do<\/em>. To combat this error, Barrett explains three truths about our brain\u2019s structure and how it functions. <\/p>\n\n\n\n First, several parts of the brain are needed, for example, to breathe, to feel angry, or to make a plan. It\u2019s not accurate to say that there\u2019s one specific part of the brain that deals with a specific function<\/strong>. (Shortform note: The understanding that several parts of the brain collaborate to perform specific tasks also debunks the common myth that the left and right hemispheres have distinct functions. While books such as The Whole-Brain Child<\/em><\/a> argue that the right side of the brain deals with emotions while the left deals with rational thought<\/a>, this is inaccurate.)<\/p>\n\n\n\n Second, appearance and location aren\u2019t the only determining factors of a neuron\u2019s function<\/strong>. When researchers studied neurons (nerve cells) more closely, they found that neurons from animals and humans can look very different or be found in different parts of each brain, yet have similar genetic structures. Thus, different animals can have brain cores that look similar, for instance, but that doesn\u2019t mean that they\u2019re responsible for primitive, instinctual functions that we believe all animals share. Likewise, just because the outer layer of our brains (the neocortex) looks different<\/em> from other animals\u2019, it doesn\u2019t mean that the animals lack the function that our neocortex plays. <\/p>\n\n\n\n Third, most brains<\/strong>, including the human brain, a monkey\u2019s brain, and a lizard\u2019s brain, develop in the same order<\/strong>. According to Barrett, the difference is that they develop different parts for different lengths of time. For example, all mammals and reptiles have a cerebral cortex (part of the neocortex), but the human cerebral cortex spends more time developing so it becomes larger and more complex than that of a monkey or lizard. <\/p>\n\n\n\n Rather than a simple and static three-layer structure, Barrett says the brain is a complex and active web of neurons<\/strong>. Put simply, neurons are the messengers of the brain. They take in information and transmit electrical impulses to each other to communicate what is happening and how the body should react. For example, if you touch a hot stove, the neurons in your brain would receive that data and instantly tell your body to pull your hand back. Barrett goes on to explain that neurons form clusters <\/em>and share information with each other. We can imagine these clusters as a group of people talking. Some of the neurons in those clusters communicate with other clusters in the vicinity (like neighbors chatting in the front yard). Some clusters are bigger and more powerful than others (such as people who have a public forum or social influence).<\/p>\n\n\n\n And some clusters communicate with other clusters across the brain, not just the ones nearby (as in email, a phone call, or on social media). In this way, the entire brain shares information and participates in shaping your experiences and behaviors.<\/p>\n\n\n\n To better understand how allostasis<\/a> (the brain\u2019s process of energy budgeting) works, it helps to know how it has affected our brain\u2019s evolution. Primitive organisms evolved to require more energy, so their energy-budgeting cells had to evolve to keep up with their needs<\/strong>. <\/p>\n\n\n\n Barrett explains that, before brains existed, primitive creatures had energy-budgeting cells that kept track of their energy needs. These cells signaled to the rest of the body when it needed to eat (or move to find food), or rest\u2014whichever would preserve its energy best in that moment. <\/p>\n\n\n\n During the Cambrian period (starting about 541 million years ago and lasting for about 56 million years), primitive animals started needing more energy and the process of budgeting energy became more complex, so those energy budgeting cells clustered together to form a brain. Barrett explains that this evolution was due to two main factors that made energy budgeting more challenging:<\/p>\n\n\n\n 1. Some primitive creatures began hunting, which meant they now had to hunt for food and escape predators. They began developing more sophisticated senses to detect danger<\/a> and opportunity and to make decisions that directly impacted their energy budgets, such as whether to move (and expend energy) to try and catch prey (to gain energy) or escape danger.<\/p>\n\n\n\n 2. Primitive creatures began evolving into more complex organisms with more organs and internal systems. The more complex an organism is, the more complex its energy budgeting becomes because each organ and system has specific energy requirements that need to be satisfied.<\/p>\n\n\n\n Barrett says that your own sophisticated sensations and movements are also the result of your brain performing allostasis. Your sensory experience is actually a combination of external data from your environment<\/strong> and internal data from inside your body<\/strong>. Your brain then combines this information with memories of similar situations to motivate you to make a change that helps manage the body\u2019s energy budget. <\/p>\n\n\n\n For example, your brain senses heat from the sun on your skin (an external sensation) and a rise in your body temperature (an internal sensation), and it tells your body to produce sweat to regulate your temperature. Your brain has to make millions of reactions like these all day, and it has to do them efficiently to stay alive. If you spend too much time in the sun without drinking water and cooling your skin with sweat, you could die. So, Barrett argues, the pressure is on for your brain to make the right call quickly<\/em>.<\/p>\n\n\n\n Barrett explains that this is where the third source of information comes into play: the brain\u2019s memories of what you\u2019ve done before when you encountered similar information<\/strong>. Before it fully processes the external and internal information it receives, it searches its memory for previous situations where the environment and your body felt similarly. It recalls what it did in that situation and triggers an action for today. This allows your brain to be one step ahead and make decisions quickly and efficiently.<\/p>\n\n\n\n All of this happens before the brain has time to contrast the real sensory data with the experience it created for you. Barrett says this is why you feel less thirsty immediately after drinking water, even though that water won\u2019t reach your bloodstream until 20 minutes later. Your brain knows you\u2019ll be satisfied in a little while, so it creates the experience of quenched thirst.<\/p>\n\n\n\n Barrett explains that after birth, a baby\u2019s brain develops according to its<\/strong> genetic coding and the physical and social environment<\/a><\/strong>. Genes help develop the basic infrastructure of the brain while environmental input triggers brain plasticity<\/a> to develop certain neural connections more or less strongly.\u00a0<\/p>\n\n\n\n Barrett identifies two specific processes that take place in the newborn\u2019s brain as genes and the environment interact:<\/p>\n\n\n\n According to Barrett, the environment\u2014especially the quality of the baby\u2019s caregivers\u2014is essential during this process. While the baby\u2019s brain is developing, caregivers perform energy budgeting tasks for them, such as feeding them, helping them sleep, and comforting them when they\u2019re distressed. This allows the brain to spend more energy tuning and pruning. Conversely, children who don\u2019t receive adequate physical and social support from their environment have difficulties developing their brains<\/strong>. This happens in situations where there is poverty or neglect, for example.<\/p>\n\n\n\n Although our brains (physical organs) share a basic architecture, each one gets tuned and pruned according to its environment,<\/strong> producing widely different minds<\/strong> (individual patterns of thought and action). This is similar to the way two college students might buy the same laptop with the same basic capabilities (brain), but they each load certain programs onto their laptops (and delete others) based on what they are studying (since their needs and culture will be different). One student might have more money and more expensive software and accessories, while the other might use the free or cheap ones (since their conditions and environment will vary as well). As a result, the two computers will appear very different once you boot them up, just like our minds.<\/p>\n\n\n\n Barrett claims that this capacity for brain variation is the result of our brain\u2019s plasticity and complexity, as neurons and neural clusters change to meet environmental needs. This flexibility makes humans adaptable to different environments, aiding in our evolution and survival as a species. As individuals, it also allows us to alter our minds by exposing ourselves to new stimuli and learning intentionally.<\/p>\n\n\n\n Barrett explains that our brains are constantly collaborating with each other in four key ways:<\/p>\n\n\n\n 1.<\/strong> Our interactions with other people encourage our neurons\u2019 tuning process<\/strong> to strengthen certain neural connections over others. This process is particularly intense when we\u2019re newborns, but it continues throughout life. For example, when you interact often with a person who speaks a different language, you might learn to speak some words in their language to communicate more easily with them. <\/p>\n\n\n\n 2.<\/strong> Our internal bodily functions have a regulating effect on the people around us<\/strong>, Barrett says. Brains coordinate with brains around them, matching breathing and heartbeat patterns, especially when we\u2019re in intense interactions (whether they\u2019re positive or negative). This can have a calming effect, for example, or help you collaborate with others more effectively.<\/p>\n\n\n\n 3.<\/strong> Our conscious actions impact others\u2019 energy budgets and well-being.<\/strong> For example, Barrett claims that saying something comforting to a person in distress can help them relax and require less energy to bring themselves back to a neutral state. On the other hand, acting in a threatening way can trigger their danger response and increase their energy load.<\/p>\n\n\n\n 4.<\/strong> Our brains collaborate to create a shared social reality<\/strong>, which includes all of the sociocultural elements that structure our life and don\u2019t rely on physical reality<\/a>. For example, we agree on national borders, the value of products and currencies, the authority of certain figures, and the power of laws. <\/p>\n\n\n\n Humans are able to create social reality because we have the following abilities:<\/p>\n\n\n\n1. We Can\u2019t Know How the Brain Works Based on Appearance Alone<\/strong><\/h2>\n\n\n\n
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2. The Brain Is a Network<\/strong><\/h2>\n\n\n\n
2.5. How Brains Evolved From Cells<\/strong><\/h3>\n\n\n\n
3. Allostasis Impacts Your Sensory Experience<\/strong><\/h2>\n\n\n\n
4. The Brain Needs Lots of Help to Develop Successfully<\/strong><\/h2>\n\n\n\n
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5. Brains Develop Into Unique Minds<\/strong><\/h2>\n\n\n\n
6. Brains Collaborate in Four Ways<\/strong><\/h2>\n\n\n\n