Neuroscience Basics

Retinal Waves and Early Visual Development Before a baby is born, its eyes are already preparing for vision. The fetal brain begins organizing how sight will work long before the eyes ever open. Rather than waiting for experience, the visual system starts wiring itself early so that, at birth, its basic circuits are already in place. Without objects to see or light entering the eyes, the developing visual system relies on internally generated activity to build its structure.

Understanding How Our Brain Sees When you open your eyes or encounter something new, your brain quickly creates a picture of what you are seeing. In about 100 milliseconds (ms), your brain has already formed a basic image of your surroundings. This image isn't complete, but it gives you a clear outline of what is there. Here is what actually happened in that brief moment: 0-10 ms: Light hits the retina. At the back of the eye is the retina, which contains photoreceptors. Pho

Your brain is not one big electrical signal. It’s actually hundreds of chemical conversations happening at once. These chemicals are neurotransmitters, and they control everything from motivation to movement. You’ve probably heard of dopamine and serotonin. Dopamine gets called the “pleasure” molecule and serotonin the “happiness” molecule. While those labels have tiny grains of truth, they’re mostly oversimplified marketing slogans. The real science is far more interesting,

Your brain doesn’t see reality. It predicts it. Your eyes send raw data, but your brain guesses what you’re looking at using memory + pattern recognition. You can grow new neurons as an adult. The hippocampus (your memory center) produces new neurons throughout life — especially when you learn new things. You feel emotions before you know what they are. The body reacts first, and your brain interprets the feelings afterward. Memories aren’t stored like files. They get rewrit

If action potentials are the electrical language of the brain, synaptic transmission is the grammar that gives those signals meaning. Because the real magic taking place in the brain doesn’t happen inside neurons. It happens between them and FAST — in about 1/10000th of a second. Action potentials are what sends electricity down a neuron, but synaptic transmission is what lets one neuron send a message to another. This “handoff” is how thoughts form, habits solidify, memories

Have you ever wondered how your brain turns a thought into a movement? Or how you remember someone’s face in a crowd? What blows my mind is that there is a constant symphony of electrical and chemical activity happening inside your skull.... as in right now and as you read this sentence. Thoughts are not intangible. You may not be able to touch them, but they are physical events - tiny measurable changes in voltage. And at the very heart of every thought, every memory, every

Have you ever wondered why dehydration makes you feel sluggish, or why athletes chug electrolyte drinks? The answer starts with something most people have never heard of - the resting membrane potential. If you haven’t studied much science, you may have never heard of a resting membrane potential . But let's break it down word by word to make it easy to understand: Membrane: The cell membrane is like the skin of the cell. It is what separates the inside of the cell from its e

Nervous Tissue: Spinal Cord Motor Neuron Every time you remember a name, learn something new, or drift off to sleep, two types of brain cells are working together: neurons and glia. Neurons: The Signal Carriers Neurons are the cells responsible for communication. You’ve probably heard the phrase, “Neurons that fire together, wire together.” A typical neuron has three main parts: the soma (cell body with the nucleus and organelles), dendrites (branches that receive signals fr

From skull bumps to brain scans, our understanding of the brain has transformed dramatically. This post traces the journey from ancient thinkers to modern neuroscience tools like fMRI and shows why the brain isn’t just history’s greatest mystery, but a guide to how we live, learn, and grow today.