3 – 8 Hz
Theta waves are associated with light sleep and dreaming. Theta waves have also been seen in monks during deep meditation. Increase in Theta waves can promote creativity and also help solidify memories. High output of Theta waves can cause depression, ADHD, and hyperactivity. Low output of these waves could result in stress, anxiety, and poor emotional awareness. Depressants are usually used to improve these frequencies output. Theta waves can also be increased with heavy exercise and extreme meditation.