Chapter 2 - Anatomic organization of the auditory cortex
Section snippets
What is auditory cortex?
In every lobe of the brain are regions that contain neurons responsive to sound. Are all of these regions part of the auditory cortex? The answer depends on how auditory cortex is defined. No single definition is entirely satisfactory, but to facilitate the present discussion, it will be helpful to establish some boundaries. For example, a functional definition could be adopted such that any portion of the cerebral cortex containing neurons responsive to sound is part of auditory cortex. While
Principles of auditory cortical organization
As detailed in Chapter 1, auditory information from the cochlea is processed in five major nuclear complexes in the brainstem and thalamus before it reaches the auditory cortex. In cortex, that information is distributed among a network of auditory and auditory-related areas that presumably mediate the conscious awareness and perception of sound. Over decades of research, several principles of organization have been derived from the major anatomic and physiologic features that serve to govern
Correspondence of human and non-human primate auditory cortex
A thorough discussion of this subject is beyond the scope of this review, but it is important to at least briefly mention here that some degree of correspondence is beginning to emerge from ongoing studies of the human and non-human primate auditory cortex. While it is not likely that the cortical organization of any two species is identical, especially in the greatly expanded cortex of humans, the basic principles of organization described above are likely common to all and could therefore
Concluding remarks
The purpose of this chapter was to provide a summary of the major organizational features of the primate auditory cortex. We began by making an operational distinction between auditory and auditory-related areas of cortex. These definitions provided the basis for a subsequent overview of six principles of organization that have emerged from over 40 years of research by scores of investigators. The bulk of the chapter was devoted to descriptions of these principles, with an emphasis on the most
Acknowledgments
The authors gratefully acknowledge the support of NIH/NIDCD grant R01 DC04318 to T.A.H.
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