Alpha is between 8 to 12 Hz and peaks at 10 Hz. It is associated with calmness, positive emotion, extroversion, creative problem-solving, mental work, and accurate perceptions of the world. It allows us to apply classroom learning to the real-world, and lets us to transition between tasks. It is the major rhythm in most relaxed adults, and starts being more prominent at age 13. Alpha brainwaves come from white matter in the brain, which is viewed as joining all parts of the brain together.