![]() The ITD is a major cue for determining the azimuth of sounds, i.e., localizing them on the azimuthal plane – their degree to the left or the right. The medial superior olive (MSO) is a specialized nucleus that is believed to measure the time difference of arrival of sounds between the ears (the interaural time difference or ITD). The superior olivary nucleus plays a number of roles in hearing. The auditory system uses several cues for sound source localization, including time difference and level difference (or intensity difference) between the ears, and spectral information. This “illusory” third tone is lateralized between the left and right ear of the listener, making binaural beats useful for spatial sound research (Ross et al., 2014).įrom the Wikipedia articles on Sound localization These beats are thought to originate subcortically in the medial nucleus of the superior olivary complex, the first nucleus in the auditory pathway to receive bilateral input (Wernick and Starr, 1968 Kuwada et al., 1979). ![]() Presenting two tones with a slight frequency mismatch to each ear separately creates a perception of a third tone, a binaural beat, that oscillates at the absolute difference between the tones (Oster, 1973 Moore, 2012). This is different from the vision system where the info goes directly to the thalamus. Temporal lobes of the cortex (the 2 arm things on the side of the brain). Hearing is cool because the neuronal neural information first goes into the brainstemĪnd then goes up some nuclei up to the thalamus. ![]()
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