Literally, to hear with two ears. Opposite of MONAURAL HEARING. The fact that the ears are some distance apart allows the localization of sound by registering the slight differences in time, PHASE and INTENSITY of the sound striking each ear. Each of these parameters has a different area of effect, intensity being a major factor above 1500 Hz (see SOUND SHADOW), while PHASE DIFFERENCEs (which are equivalent to time differences) are used in localizing lower frequency sounds.
Any process that encourages a person to listen more discriminately, particularly to sounds of the environment. The term was originally used by R.M. Schafer in his book Ear Cleaning (Toronto, BMI Canada, 1967) to contrast with the traditional practice of ear training in music education which concentrates on the identification and reproduction of intervals, chords, melodies and so on.
Any VIBRATION in the air or other medium, some types of which are able to cause a sensation of hearing.
If two TONEs are about 15 Hertz or less apart, INTERFERENCE will result from their similar though not exactly identical frequencies. Gradually they will move out of PHASE until at 180