Noise or sound influence us in four main ways: physiological (sudden and unpleasant noise can increase heart beat), psychological (sound can either calm us down or raise the stress level), cognitively (how we perceive things and consequently also our learning ability) and finally behaviourally (noise can make us more aggressive and less helpful). Learn more about this by watching the video The 4 ways sound affect us with the sound expert Julian Treasure. Investing in pleasant acoustic environments has many positive health effects.