Fequency hearing cochlea
Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The embed version with watermark is free of charge. How are sounds of different pitch differentiated by the ear? A sound with a defined frequency doesn't stimulate all sensory cells in the cochlea to an equal extent. The basilar membrane starts to vibrate intensely only in a small confined area. When the frequency changes also the place of vibration will change. Sounds with high frequency are detected in the front section, with lower frequency in the rear section of the cochlea. For evaluation and most likely also for conscious perception of the acoustic signals the auditory cortex is responsible. What happens there is no longer a matter of sound equations or acoustic laws. But when there is noise outside, when somebody is talking or music is playing, the signals reach your consciousness at lightning speed. Traveling of sound waves into the human ear causes "hearing" by some miraculous way.