Entrainment is the predisposition that two oscillating bodies have whereby they will lock into phase so they vibrate in harmony with one another.
Entrainment occurs when two or more rhythmic cycles become synchronized . This principle is universal and can be found in many areas of science, including chemistry, neurology, biology, medicine and astronomy.
When the brain is given a stimulus through the ears or other senses it emits an electrical charge and when the brain is presented with a repeating stimulus it responds by synchronizing these electrical cycles to the same rhythm – commonly known as frequency following response. FFR. With the use of instruments and specific frequencies we can stimulate brainwave frequencies associated with wellbeing. For example 4-8 hertz is the theta brainwave frequency which can be used for those suffering with insomnia, stress and anxiety. Psychoneuroimmunology is the study of central nervous system and the immune system and how brainwave states affect this.