What is brainwave entrainment?

Brainwave entrainment, also known as 'brainwave synchronization' is a practice that depends upon a 'frequency following' response from your brain, following a dominant external stimulus. Usually, the external stimulus is a specialized software, but it can also be a pulse of sound or light.
When the brain receives an external stimulus, through ears, eyes or any other senses, it emits a response which is called a 'cortical evoked response'. These electrical responses travel throughout the brain and they can be measured using sensitive devices attached to the scalp.
When the rhythmic stimulus presented to the brain is, for example, a drum beat, the rhythm is reproduced in the brain in the form of a 'cortical evoked respose'. If the rhythm becomes fast and consistent enough, it can start to resemble the natural internal rhythms of the brain, called 'brainwaves'. When this happens, the brain starts responding by synchronizing its own electric cycles to the same rhythm as the drum beat. This is usually called a 'Frequency Following Response' or FFR.

10 interesting facts about our brain

Our brain is made up of about 75% water.

While awake, our brain generates between 10 and 23 watts of power, enough energy to power a small light bulb.

There are no pain receptors in the brain, so the brain can feel no pain.

There are over 150,000 km of blood vessels in the brain.

If our brain loses blood for 8 to 10 seconds, we will lose consciousness.

Boredom is brought on by a lack of change of stimulation, is largely a function of perception, and is connected to the innate curiosity found in humans.

Our brain consists of about 100 billion neurons.

The human brain is the fattest organ in the body and may consists of at least 60% fat.

Women tend to take longer to make a decision, but are more likely to stick with the decision, compared to men, who are more likely to change their mind after making a decision.

Our skin weighs twice as much as our brain.