We often use auditory illusions to probe the organizational "rules" used by the auditory system (see the textbook for some examples of these "rules" of auditory perceptual organization). But we do know that lots of things contribute to the perceptual organization (grouping or segregation) of sound signals. Motion of the cloths, you have to figure out what's happening on theĪuditory scene analysis is not all that well understood. Two pieces of cloth correspond to your two ear drums. Lake correspond to sound waves, the two channels correspond to your ear The lake corresponds to your auditory world, the waves on the Uses this picture as an analogy for what your auditory system mustĭo. But in fact, the physical stimuli (the sound pressure waveforms) from these two groups of string instruments are very similar - entirely overlapping and intertwined with each other.Īl Bregman calls this the problem of auditory scene analysis and he You can, if you wish, attend to the violin part, and then listen specifically to the line played by the cellos. Imagine listening to an orchestra concert. How does your auditory system keep track of all these auditory events (what caused the sounds, where, how many)? For example, when you are listening to music you can listen analytically (breaking things down) or holistically. There are many things happening simultaneously that all result in sounds that reach your ears. Topographic maps of this sort are a big deal - we'll see many examples in the visual system of how information about various aspects of vision gets laid out amongst a collection of neurons in a systematic way. It has a couple of subregions or subnuclei. In each subnucleus (e.g., labelled AVCN and DCN in the figure below), nerve cells responsive to low frequencies are at one end and nerve cells that are responsive to high frequencies are at the opposite end, with the intervening frequencies laid out in their proper, ascending order.Īnalogous tonotopic organization is also found in the auditory cortex. The cochlear nucleus is also organized tonotopically. The figure above illustrates tonotonic organization in the inferior colliculus. The cochlea along the basilar membrane is repeated in other auditoryĪreas in the brain. Tonotopic organization: The spatial layout of frequencies in Information for the auditory system about where a sound came from (see Inter-aural comparisons are an important source of Significant number of nerve fibersĬross the brain and make connections with neurons on the side oppositeįrom the side of the ear in which they begin.
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