You already understand at that age the feeling of achievement and reward, and the feeling of relaxation after a struggle.

It refers to a tingling, static-like sensation across the scalp and the back of the neck, accompanied by feelings of relaxation.

But it also creates feelings of relaxation and euphoria.

For at least 200 years scientists have proposed links between different colors and emotional responses—for example, red elicits feelings of excitement, and blue, feelings of relaxation.

Users report feelings of relaxation, sharpness, calmness, and alertness.