Exposure to stressors may be associated with the production of asymmetry in brain waves and can significantly affect a person's overall degree of wellbeing and conversely, asymmetry may influence a person's experience of stress. Through devices and methods that simultaneously look for asymmetries and in real time, one can create real time variable sequences of acoustical stimuli, and then one can effectively and efficiently support the brain to balance its activity between corresponding right and left lobes without one's mindful attention. Additionally various devices and methods can be used to identify condition states, including stress state conditions.