Understanding Brain Pathways for Perception and Movement

 Generally, I think most people accept that the brain is the center of our body. If the heart is the engine, the brain is the steering wheel. No matter how powerful or capable the engine, the steering wheel is needed to actually control that power. Our brains are responsible for processing sensory information, regulating emotions, and creating complex movements. It’s the center of both nature and nurture, shaping our perception of the world and controlling our behavior. To be honest, I just want to talk about the general ideas behind neurobiology; sensory neurons, the circadian rhythm, the visual system, and how various brain regions work together to keep us alive. It’s cool stuff, I promise.

So, to start, I like to think of the nature-nurture debate like the construction of a house. Our genetic makeup is like the foundation, while our experiences and knowledge form the actual house’s structure. Without a strong foundation, a house cannot be built, but a shoddy house can also be built on a phenomenal foundation. Sensory neurons, in this analogy, are like the windows. They’re pathways for information to enter from the outside world, filtering through the body's systems to create meaning. No matter what manner of sensory input we receive, from sight to smell to touch, become indistinguishable as electrical signals that flow through neural pathways to create our consciousnesses. Our brain is somehow extremely specialized, yet very generalized. Ok wait, what does that mean? I mean that each brain area recognizes fine details, yet it all synthesizes into a singular understanding. I doubt you’re consciously thinking about every single thing you see, smell, taste, hear and touch, yet your brain does all that and simplifies it, for every single tiny moment of our days. There are so many functions that the autonomic nervous system controls that you don’t even have to think about.

Now you’re manually breathing. Now you know that you’re blinking. Feel the sensation of your tongue inside your mouth. Nightmare nightmare NIGHTMARE

Sorry. Anyways, onto some little thoughts on sight. Consider color perception for a moment, or hell, just sight in general. We recognize the light and shadows around us as objects, which we synthesize into a 3D understanding of our surroundings. THEN, the brain transforms the raw data of the reflection of certain wavelengths into the colors we experience. It’s just so fucking rad, and you can’t convince me otherwise. Some science on this; there are little cells called ganglions in the retina’s cones. They’re specialized photoreceptor cells that absorb light at different wavelengths. These wavelengths are responsible for all the color sensations we perceive. Each color is dedicated to certain specified neurons that are sensitive to certain wavelengths. One more mindfuck on this; the biological mechanisms underlying color perception are physiologically similar across individuals. Most people possess three types of cones that enable us to see a wide spectrum of colors. The question here, though, is this: do each of us associate the names of colors to different wavelengths? Like, is my blue the same as your blue? Although colors are always within their own wavelengths, how this color actually “looks” in your mind might be different to someone else. Your “blue” might be my red. In that way, each of us might view the world slightly differently. Just something to consider.

Now onto the circadian rhythm. Sorry to people who’ve read other things I’ve written, since I’ve talked about this a million times before. But anyways. The circadian system provides us with an internal sense of the Earth's rotation. This biological clock relies on the processing of natural light to regulate various bodily functions, from sleep and hormones to appetite and mood. The circadian system is connected with the autonomic nervous system that I mentioned before, playing a crucial role in hormones like melatonin. And yeah, melatonin isn’t just something you take to sleep. It’s already produced in the body at the correct levels, so please don’t supplement it unless it’s really necessary. The issue with supplementation is that it can prevent your body from producing it effectively, or may shut down production significantly. This will prevent you from getting tired healthily/naturally, so it’ll just make your sleep issues worse. Form a consistent sleep habit, and boom; circadian rhythm is fixed. If you have diagnosed conditions or suspect a condition, plz see a doctor. I’m no expert.

Now, onto movement-related systems. The vestibular system, nestled deep within the inner ear, detects our movements through the world. It works with the auditory system, confirming our sense of movement by recognizing how sound changes in the air. The brain's internal image stabilization makes sure that when we make sudden movements, such as rotating our head, our eyes compensate to maintain stability. This is how the visual and movement systems work together. Motion sickness, a common experience especially in childhood, occurs when the brain receives conflicting information about movement. For instance, when our eyes are fixed on a book or a phone while our body is in forward motion, the brain struggles to reconcile these opposing signals, often leading to nausea. So, travel nausea is due to brain miscommunication. Isn’t that kinda cool?

Next is the cerebellum, often referred to as the brain's air traffic control. It integrates visual and balance information, ensuring correct timing between input and output for smooth and coordinated movements. Damage to the cerebellum can result in tremors and unsteadiness. You may have heard of cerebellar hypoplasia, a neurological condition in which the cerebellum is smaller than usual or not completely developed. This causes coordination deficits proportional to the lack of cerebellar growth. Beyond the cerebellum, there are several brain regions that contribute to movement. The midbrain is one of our earliest developed areas of the brain, and it works to understand spatial orientation and directs our attention toward or away from external stimuli. The basal ganglia serves as the "go/no go" center, determining appropriate behavior based on context. It works closely with the cortex, where maps of the visual world are formed, allowing us to perceive our surroundings. All of these areas together allow us to walk, an action you also never even think about.

In terms of our brains, we take so much for granted. The brain's extraordinary complexity arises from dozens of specialized areas and approx. 100 billion neurons (!), allowing us to perceive the world, regulate our circadian rhythm, and navigate our environment. From the intricacies of color perception to the many hidden challenges of movement, our brain's multifaceted functions display its adaptability and resilience. Despite how little we know about the brain, I hope we can gain deeper insights into what makes us US, with our unique blend of genetics and experience shaping our perception of the world.