He will start turning his head although he can't see anything. For a demonstration, blindfold a friend and ask him to locate a ticking clock that you have hidden in the room. Changes in sound levels, delay times and sound color refine the sense of direction. The information obtained by these mechanisms is further refined by movements of the head. Thirdly, reflections of the soundwaves from the walls, ceiling and floor of our listening room produce reverberation that conveys an extra feeling of space. Since these reflections depend on the direction of the soundwave the "color" of the sound changes with the direction of the source. Reflections at the oracles (pinnae) interfere with the soundwaves that directly enter the ear-channel and amplify or attenuate specific frequency components. Secondly, the soundwaves are partly absorbed and partly reflected by the tissues of the head. The level of attenuation and the delay time of this crossfeed signal provide important directional information. the right loudspeaker) not only reaches the right ear but, attenuated and delayed, is also heard by the left ear. Firstly, the sound of a source to the right side of the listener (e.g. In normal daily life people use various mechanisms to locate sources of sound.
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