Alpha waves are released in the wakeful condition of brain while relaxing. Generally the pattern of waves with in a brain oscillated between beta/theta waves to Alpha waves and then again to beta/theta waves.
The alpha waves replaces stress and anxiety and also enhances the mental and physical performance. Green teas and energy drinks increase the alpha waves.
The answer is alpha waves.When one relaxes, the brain would emit these waves which are known to be slower than brain waves. These then have a slow rhythm and a high amplitude.They are also known to boost creativity and does reduce depression.