{"id":129046,"date":"2024-08-23T09:06:32","date_gmt":"2024-08-23T13:06:32","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=129046"},"modified":"2024-08-28T09:43:19","modified_gmt":"2024-08-28T13:43:19","slug":"thousand-brains-theory","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/thousand-brains-theory\/","title":{"rendered":"The Thousand Brains Theory: Jeff Hawkins Explains"},"content":{"rendered":"\n

Are your thoughts the result of thousands of tiny brains voting? What if your sense of self is actually an illusion created by these mini-minds?<\/p>\n\n\n\n

In A Thousand Brains<\/em>, Jeff Hawkins presents a groundbreaking theory about how our brains function. He proposes that the neocortex consists of thousands of cortical columns<\/a>, each acting as a mini-brain. These columns work together to create our complex cognition and awareness.<\/p>\n\n\n\n

Read on to learn about the Thousand Brains theory and see how it could revolutionize our understanding of human intelligence.<\/p>\n\n\n\n\n\n\n\n

The Thousand Brains Theory<\/h2>\n\n\n\n

In essence, Hawkins\u2019s Thousand Brains theory is that the brain is composed of thousands of nearly identical information processing units from which our awareness and intelligence emerge. We\u2019ll begin by describing the functions of these units, how each supports a fraction of the brain\u2019s total function, and how they coordinate with each other.<\/p>\n\n\n\n

Hawkins proposes that the neocortex, the part of your brain responsible for higher cognitive functions, consists of around 150,000 cortical columns that each act as a mini-brain.<\/strong> Each column receives inputs, builds mental models<\/a>, and makes predictions just as the brain does as a whole. The coordinated activity of these thousands of mini-brains working together produces the complex cognition and awareness that your brain is capable of.<\/p>\n\n\n\n

(Shortform note: Hawkins attributes the discovery of cortical columns to Vernon Mountcastle in the 1950s, but as recently as 2005, neuroscience research had failed to establish a definitive purpose for these columns<\/a>. The concept of a “column” itself wasn\u2019t well-defined, with researchers using the term to refer to a variety of vertical cell clusters without a consensus on their significance. Furthermore, the existence and nature of cortical columns across different species is inconsistent, suggesting they may not <\/em>be a fundamental unit of brain organization<\/a>.)<\/p>\n\n\n\n

According to the Thousand Brains theory, each mini-brain in the neocortex processes a specific aspect of sensory input.<\/strong> One cortical column might learn how an object feels, while another learns what noises it makes. No single column has a complete understanding of any given object or concept. Instead, your brain’s knowledge is distributed across thousands of these columns. This architecture makes the brain robust and resilient\u2014it doesn’t depend on any individual neuron or cortical column to function. Rather, cognition emerges from the parallel, redundant processing of all the mini-brains working together. Your cortical columns are highly interconnected, allowing them to integrate their outputs into a unified whole.<\/p>\n\n\n\n

(Shortform note: It\u2019s long been understood that different parts of the brain process different senses, though few authors before Hawkins explain exactly how the brain composites inputs into a sensory \u201cwhole.\u201d In Brain Rules<\/em><\/a>, John Medina suggests that there are two steps your brain takes to process your senses<\/a>. First, your brain first assembles <\/em>the different types of stimuli you\u2019ve absorbed into a full picture. Second, it interprets <\/em>this picture by adding meaning. Since the interpreting step is subjective, based on individual experience, no two brains will perceive any given stimulus in the exact same way. Nevertheless, assembly and interpretation require some physical process in the brain for your neurons to carry them out.)<\/p>\n\n\n\n

Hawkins posits that each mini-brain communicates its findings to the rest, and through a process akin to voting, the cortical columns arrive at a consensus<\/strong> about what your senses detect and how you should react. Each column announces its perception and preferred reaction based on its individual input, and the brain\u2019s overall response corresponds to the majority opinion of the columns. This produces what your conscious mind perceives as a unified experience despite the distributed nature of cortical processing.<\/p>\n\n\n\n

Your Thousand Brains\u2019 Consensus of Self<\/strong>

If your conscious awareness is, as Hawkins suggests, a product of thousands of unconscious mini-minds voting, that may provide a scientific grounding to the belief of some philosophers (and many practicing Buddhists) that your sense of being a unified \u201cself\u201d is just an illusion. In Waking Up<\/em><\/a>, Sam Harris argues that while your consciousness emerges from the workings of your brain<\/a>, your sense of self<\/em>\u2014the feeling that you\u2019re an incorporeal being looking out through your eyes and steering your body\u2014is merely a figment of your brain\u2019s imagination.

This feeling is a product of what Harris calls \u201cpsychological continuity<\/a>,\u201d the constant creation and narration of memories about your experience from one moment to the next, which leads to the illusion that the \u201cyou\u201d inside your head today is the same person you were yesterday or will be tomorrow. If Hawkins is right, then the \u201cyou\u201d who\u2019s reading this is simply an amalgamation of an ever-changing voting bloc of unconscious cortical columns living side-by-side in your skull.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

How the Brain Works<\/h3>\n\n\n\n

To fully understand Hawkins\u2019s ideas about how the human brain generates intelligence, we\u2019ll have to explore how the brain works<\/a> as a whole. We\u2019ll cover how the brain\u2019s newer structures (those that form what we call the neocortex<\/em>) relate to its older, more primitive components. We\u2019ll describe the fundamental building blocks of the neocortex, how they create mental models of the world, and how the same neural circuitry that lets us navigate our physical environment also gives us the capacity for abstract thought<\/a> and contemplation.<\/p>\n\n\n\n

In Hawkins’s book, before he delves into his new Thousand Brains theory, he takes a moment to review the older prevailing theory. The old model proposes that your brain processes sensory information<\/a>, like vision and hearing, in a step-by-step manner like a flowchart. At the bottom of the chart, different nerves in your brain respond to simple features, such as lines and colors. As you move up the hierarchy, each new level of the brain responds to increasingly complex information from the regions below it. <\/p>\n\n\n\n

Hawkins argues that, while this theory explains some early neuroscience findings, it treats sensing as a static, one-way process<\/strong>, ignoring how your movements and changing environment actively shape your perception. The \u201chierarchical\u201d theory also can’t explain how your brain fills in gaps to create a cohesive understanding of the world from partial sensory data. Hawkins writes that, while the hierarchy theory was a good model for brain research to work from, neuroscientists now recognize that it needs updating to incorporate the interactive, dynamic nature of perception.<\/p>\n\n\n\n

Other Views on the Brain<\/strong>

The hierarchical theory that Hawkins discusses is far removed from the most highly popularized model of the brain\u2014namely that different cognitive abilities are segregated in the brain\u2019s left and right hemispheres. Commonly known as \u201cbrain lateralization,\u201d the left and right brain\u2019s different functions were originally mapped in the 1930s<\/a> by Canadian surgeon Wilder Penfield. Psychologists have long believed that individuals are more dominant on one side or the other, describing them as \u201cleft brain\u201d or \u201cright brain\u201d people<\/a>. However, more recent MRI studies show that there\u2019s no such thing as left or right dominance<\/a>.

In Seven and a Half Lessons About the Brain<\/em><\/a>, Lisa Feldman Barrett argues that the left\/right model is overly simplistic to the point of being misleading. It gives a false impression<\/a> that specific regions of the brain<\/a> control specific bodily functions, when in fact each function is controlled by clusters of neurons networked throughout the brain<\/a>. The neural clusters that Barrett writes about may be equivalent to the \u201ccortical columns\u201d that we\u2019ll see are central to the Thousand Brains theory, but Barrett\u2019s focus is on brain development, not the minutiae of how nerve clusters function.

Meanwhile, the hierarchical view of brain structure is alive and well<\/a>, though the hierarchy that neuroscientists study is more complex than that which Hawkins presents. It isn\u2019t a simple top-down hierarchy like a corporate organizational chart. Instead, different areas of the brain’s sensory systems are arranged based on how close they are to the input. However, scientists have found that the brain has many neural connections that let information skip steps in the process. Proponents of this theory admit that the brain can only be semi-hierarchical\u2014not totally sequential or totally random. The brain\u2019s \u201chierarchy\u201d ends up being messy and complicated\u2014or, as Hawkins suggests in this book, perhaps there\u2019s not much hierarchy at all.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The Old Brain and the New<\/h3>\n\n\n\n

Though the thousands of mini-brains that comprise your neocortex get all the credit for intelligent behavior, they\u2019re far from the only important part of your brain. Instead, the neocortex is entirely dependent on the older, more primitive parts of your brain to interact with the outside environment at all. Here, we\u2019ll expand on how the different parts of your brain interact, what functions the primitive parts of your brain perform, and how the two work together to build your understanding of the world.<\/p>\n\n\n\n

Hawkins explains that the human brain is divided into two main parts\u2014the Old Brain<\/a> and the neocortex. <\/strong>From an evolutionary perspective, the Old Brain is ancient and is similar to that in many animal species. It\u2019s responsible for maintaining your basic biological functions and reflexes. In contrast, the neocortex is a more recent evolutionary development. It\u2019s much larger in humans than in other species, accounting for 70% of your brain and acting as the source of your intelligence. The neocortex processes sensory information and, in humans, is capable of complex cognitive functions such as language and mathematics.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

<\/p>\n\n\n\n

The Old Brain\u2019s Influence<\/h4>\n\n\n\n

Although your neocortex is where your higher thought processes reside, Hawkins writes that it doesn\u2019t operate in isolation from your Old Brain. All sensory signals and motor commands must pass through the Old Brain before reaching the neocortex<\/strong> or being enacted by the body. Though the neocortex is divided into different regions that process specific types of information, such as vision, hearing, and language, these regions are highly interconnected. Every part of the neocortex is also connected to both the sensory inputs and <\/em>the motor control areas of the Old Brain, indicating the close relationship<\/a> between your senses, your thoughts, and your actions.<\/p>\n\n\n\n

Hawkins is clear that the brain doesn\u2019t process information in a linear, input-output fashion like a computer. Instead, the neocortex constantly makes predictions based on past experience and the Old Brain\u2019s current sensory input.<\/strong> When predictions and inputs match, your neocortex strengthens its existing neural connections\u2014such as when you judge how hard to toss a ball and it lands exactly on your target. When your neurons\u2019 predictions are wrong, like when you miss when throwing a ball, your brain will form new neural connections to update its mental models of the world. This process of prediction and error correction is a fundamental aspect of how brains learn, and since all the neocortex\u2019s information comes from the Old Brain, they have to work together to enable intelligent thought and decision-making<\/a>.<\/p>\n\n\n\n

Cortical Columns<\/h3>\n\n\n\n

From the high-level view of the brain, let\u2019s zoom in on the neocortex. In a way, the neocortex looks like a crumpled-up towel, but if you were to flatten it out, you\u2019d see that it\u2019s a single sheet made of layers of nerve cells. Looking even closer at the flattened neocortex, we\u2019ll find that it\u2019s chiefly composed of vertical \u201ccolumns\u201d of cells that form circuits capable of making predictions and creating models of anything the brain encounters.<\/p>\n\n\n\n

According to Hawkins, cortical columns are the fundamental information processing units of the neocortex.<\/strong> Each cortical column\u2014a \u201cmini-brain\u201d in its own right\u2014consists of a vertical arrangement of brain cells (neurons) spanning the horizontal layers of the neocortex. The human brain has approximately 150,000 cortical columns, and despite serving a variety of functions\u2014such as interpreting speech or remembering directions\u2014every cortical column operates according to the same basic principles. This uniformity suggests that the brain processes every type of information<\/a> using a standard set of rules, making the study of cortical columns crucial for understanding brain function as a whole.<\/p>\n\n\n\n

Within a cortical column, neurons receive input through their dendrites\u2014the finger-like extensions on the end of each nerve cell\u2014and synapses\u2014the points at which nerve cells connect. Neurons learn to \u201cpredict\u201d certain inputs and react when inputs differ from their expectations.<\/strong> Hawkins explains that when multiple neurons in a cortical column receive the same unexpected input, they \u201cfire\u201d as one, sending signals to other columns throughout the brain. Since each neuron receives inputs from thousands of synapses, a single cortical column can process hundreds of inputs, make predictions, and generate responses at the same time. <\/p>\n\n\n\n

<\/p>\n\n\n\n

Models in the Mind<\/h3>\n\n\n\n

However many inputs they learn, no single neuron can create what we\u2019d consider a coherent thought. That\u2019s why Hawkins asserts that clusters of neurons with thousands of connections are needed to fully interpret your senses and generate your mind and body\u2019s reactions. Working together, these clusters of neurons create models of your environment, decide what to do and think based on those models, and learn more information about the world when your current models prove insufficient.<\/p>\n\n\n\n

Hawkins suggests that, to make accurate predictions, cortical columns model objects and their positions in three-dimensional space using reference frames,<\/strong> which can be thought of like the grid lines on a map. His research shows that to create reference frames, neurons must be connected to both sensory input and motor output\u2014it isn\u2019t enough to see <\/em>the world; your brain must be able to move <\/em>through it. Different layers within a cortical column specialize in modeling objects and their positions separately\u2014some neurons learn the shape of an object, while others determine where it exists. This modular setup lets the neocortex efficiently process and integrate information from your whole range of senses at once.<\/p>\n\n\n\n

These mental models form the foundation of all higher cognitive functions. Hawkins writes that as you interact with your environment, your neocortex continuously makes predictions based on your current mental models<\/strong> and compares its predictions to your sensory input. When predictions are accurate, they reinforce your existing models and strengthen their underlying neural connections. When predictions are wrong, your brain updates its models to better reflect reality. This constant cycle of prediction, feedback, and adjustment is the basis of learning, and according to the Thousand Brains theory, what\u2019s happening on the brain\u2019s macro level is actually taking place in each cortical column associated with a particular mental model.<\/p>\n\n\n\n

Most of the predictions your brain makes are unconscious. Every time you move, such as by shifting your gaze or stepping into a room, your brain predicts what it expects to perceive. If nothing\u2019s unexpected, you don\u2019t notice anything\u2014your cortical columns don\u2019t light up and fire\u2014but any surprises draw your attention and trigger your conscious brain to update its models.<\/strong> Hawkins says that since each cortical column contributes to hundreds of different mental models, they can switch between hundreds of different maps depending on your current sensory context. This flexibility allows your brain to navigate effectively through your ever-changing world.<\/p>\n\n\n\n

Abstract Thought<\/h3>\n\n\n\n

So far, the mental models we\u2019ve discussed all pertain to physical spaces and objects, but how does the neocortex create and process ideas about things that we can\u2019t see, taste, or touch? If Hawkins is correct that all your brain\u2019s higher functions emerge from the models and predictions created by cortical columns, then the neocortex’s models and reference frames must extend beyond representations of the physical world to enable abstract thought. These abstract reference frames must be more complex than those for physical objects while also functioning in much the same terms\u2014those of creating, moving, and adjusting models of ideas in the mind.<\/p>\n\n\n\n

Hawkins explains how the same basic circuitry that lets us navigate and interact with the world also underlies our capacity for language, mathematics, imagination, and conceptual reasoning. The key lies in the nature of reference frames. While reference frames for physical objects are three-dimensional, reference frames for abstract concepts have multiple dimensions,<\/strong> each representing a different aspect or degree of the feeling or idea. For example, emotions like happiness and sadness can be thought of as having dimensions such as intensity, duration, and type. Concepts such as human rights can be thought of as having boundaries and limits much like the contours of a physical object.<\/p>\n\n\n\n

To explain abstract thought, Hawkins proposes that, when you think about an abstract concept, your neurons fire as if you’re moving through an abstract reference frame, <\/strong>just as they do for models of the physical world. When you recall a memory\u2014such as that of the house you grew up in\u2014you mentally traverse the associated reference frame\u2014in this case, the mental map of your old house\u2014activating the corresponding neurons in the brain. Similarly, when you explore an abstract concept, such as the Thousand Brains theory, your brain constructs a reference frame that maps out its logical connections and arguments. You then navigate this mental map as you reason through the implications of the theory.<\/p>\n\n\n\n

This process of building and traversing reference frames lets you understand and manipulate abstract ideas<\/strong> across various domains, from cooking and music to relationships and emotions. As you create new reference frames, they connect to and build upon your existing knowledge, allowing ideas to cross-pollinate, leading to the emergence of your unique, individual patterns of thought. Thus, Hawkins concludes that the neocortex’s ability to construct and navigate multidimensional reference frames is the foundation of human intelligence and abstract reasoning.<\/p>\n\n\n\n

Exercise: Reflect on How You Think<\/h3>\n\n\n\n

The Thousand Brains theory suggests the thoughts you\u2019re having right now<\/em> are produced by thousands of mini-brains in your neocortex, each of which represents a small portion of your total cognitive abilities. Think about whether you find Hawkins\u2019s theory plausible and what its implications might be.<\/p>\n\n\n\n

    \n
  1. What do you find surprising or counterintuitive about how Hawkins describes the brain\u2019s higher functions? In what way does his explanation of the neocortex differ from your previous understanding of the brain?<\/li>\n\n\n\n
  2. Do you find it plausible that the same mental processes we use to navigate the physical world might also govern how we think about abstract concepts? Why or why not? When you think of an abstract idea<\/a>, how do you \u201cpicture it\u201d in your mind?<\/li>\n\n\n\n
  3. If all of human intelligence is produced by a basic neural circuit copied thousands of times in your brain, what does that say about the potential for computer circuits and software to achieve human-like cognition? Do you believe that\u2019s something that might happen in your lifetime, and if so, how do you feel about that?<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Are your thoughts the result of thousands of tiny brains voting? What if your sense of self is actually an illusion created by these mini-minds? In A Thousand Brains, Jeff Hawkins presents a groundbreaking theory about how our brains function. He proposes that the neocortex consists of thousands of cortical columns, each acting as a mini-brain. These columns work together to create our complex cognition and awareness. Read on to learn about the Thousand Brains theory and see how it could revolutionize our understanding of human intelligence.<\/p>\n","protected":false},"author":9,"featured_media":129056,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[160],"tags":[1576],"class_list":["post-129046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-a-thousand-brains","","tg-column-two"],"yoast_head":"\nThe Thousand Brains Theory: Jeff Hawkins Explains - Shortform Books<\/title>\n<meta name=\"description\" content=\"The Thousand Brains theory could revolutionize our understanding of human intelligence. 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