NeuroExplorer

As neuronal signals are constantly fired by the brain, they produce rhythmic electrical patterns known as brain waves that can be detected through a monitoring method known as electroencephalography (EEG). Electroencephalography is a noninvasive process during which electrodes (small metal conductors) placed on the scalp detect the brain waves. The EEG machine then amplifies and records the signals in a wave pattern. The human brain produces four types of brain waves that each create distinguishable shapes on EEG readings: alpha waves, beta waves, theta waves and delta waves. Alpha and beta waves are produced by the awake brain. Alpha waves, with frequencies of 8 to 13 Hz, originate mainly in the parietal and occipital lobes of the brain when the eyes are closed and the brain is relaxed. Beta waves are faster, with frequencies of 14 to 30 Hz, and originate in the frontal and parietal lobes when you are processing a sensory input or focusing on a task. Theta and delta waves are prod

Imagination will often carry us to worlds that never were. But without it we go nowhere. — Carl Sagan Astronomer  

The eyes are your windows to the external world. You are surrounded by different types of energy and molecules that must be translated into perceptions through a network of cells, fibers and electrical signals. Let's take a journey through the eye. In order to understand how vision works, we must first understand what light is. Light is an electromagnetic (EM) wave made of oscillating electric and magnetic fields. EM waves are able to travel without a medium, which is why light is able to travel to Earth through the vacuum of space. However, it is only a sliver of the entire electromagnetic spectrum (pictured below). The light that we are familiar with is visible light. However, there are also radio waves, microwaves, infrared light, ultraviolet light, X-rays and gamma rays  —  and all of them are invisible to us! This is because the human eye can only detect wavelengths from 400 to 700 nanometers (visible light). Visible light itself has a range of wavelengths that determines