Neural connections

The Light-to-Electricity Conversion Right now, photons from your screen are hitting your retina and literally causing chemical reactions in your rod and cone cells. These cells contain proteins called rhodopsin that physically change shape when light hits them - like tiny molecular switches flipping. This shape change triggers a cascade of chemical reactions that ends up opening ion channels in the cell membrane.

The Electrical Signal When those ion channels open, sodium and potassium ions flow across the cell membrane, creating an actual electrical voltage change - we're talking real electrons moving around. This voltage change (called an action potential) is about -70 to +30 millivolts. It's a genuine electrical signal, just like in a wire, except it's traveling along the membrane of a living cell.

From Eye to Brain These electrical pulses race along your optic nerve at about 120 meters per second. They're literally trains of electrical spikes - you could hook up an oscilloscope and see them as voltage blips. When they reach neurons in your visual cortex, they trigger the release of neurotransmitter chemicals at synapses, which then trigger more electrical signals in the next neurons.

Pattern Recognition Here's the crazy part: the specific text you're reading creates a unique pattern of which neurons fire and when. The letter "h" creates one pattern of electrical activity across thousands of neurons, "o" creates another pattern, "w" yet another. Your brain recognizes these patterns because previous learning has strengthened the synaptic connections that respond to these specific firing patterns.

The Information IS the Pattern The meaning of what you're reading literally IS the pattern of electrical activity flowing through your neural networks right now. There's no translation step - the information exists as the electrical pattern itself, flowing through circuits that have been shaped by all your previous experiences with language.

You're basically a biological computer processing electrical signals, except way more sophisticated than anything we've built.