In 1931 Karl Zietz found that low pitch sounds would make the red more yellowish. The after image colour and outline was sharpened on a high pitch and more blurred with a low pitch. In 1935 Kravkon found that loud noises, bright lights and strong tastes decreased our sensitivity, weakened our muscle strength and increased the eye's sensitivity to green. Different cultures combine music, dance and visual stimulation in their religious practices. Music's hypnotic, unifying quality can be used negatively as in some of the high stepping marches, eg. goose-step utilised by Hitler.
War music can give strength and power, eg.
Bass drums can dilate the capillaries in the body and increase heart rate. In the martial arts sound is used to deflect or add power to movement. Feelings are also affected by sound. Louder sounds can exclude all other sensitivities and may create a feeling of protection. Loud sounds also have a stronger carrying power, while soft ones are more intimate and serene.