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Five qualities of a sound wave may be used to define it: wavelength, amplitude, time period, frequency, and velocity or speed. The wavelength of a sound wave is the shortest distance at which it repeats itself.The ear canal is a tiny opening that connects to the eardrum. The eardrum is reached by sound waves passing via the ear canal, a small opening. Sound waves are "caught" by the outer ear (pinna) and sent to the middle ear, which is shielded, through the ear canal. The eardrum vibrates as a result of these entering sound waves.The majority of psychologists concur that the location principle applies to hearing sound stimuli at high frequencies, whereas those at low frequencies are explained by the frequency theory. Mid-frequency sound stimuli are thought to be properly accounted for by both hearing theories.In humans and many other species, the auditory cortex is the area of the temporal lobe that deals with auditory information. It is a component of the auditory system that performs both fundamental and advanced hearing processes, including those that may be related to language switching.