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Titel
A Discontinuous Tonotopic Organization in the Inferior Colliculus of the Rat
Autor(es)
Schlagwort
Auditory
Inferiorcolliculus
Tonotopic organization
Laminar organization
3-D reconstruction
Critical bands
Fecha de publicación
2008
Citación
Malmierca, M. S., Izquierdo, M. A., Cristaudo, S., Hernández, O., Pérez-González, D., Covey, E., & Oliver, D. L. (2008). A discontinuous tonotopic organization in the inferior colliculus of the rat. The Journal of neuroscience : the official journal of the Society for Neuroscience, 28(18), 4767–4776.
Resumen
[EN]Audible frequencies of sound are encoded in a continuous manner along the length of the cochlea, and frequency is transmitted to the brain as a representation of place on the basilar membrane. The resulting tonotopic map has been assumed to be a continuous smooth progression from low to high frequency throughout the central auditory system. Here, physiological and anatomical data show that best frequency is represented in a discontinuous manner in the inferior colliculus, the major auditory structure of the midbrain. Multiunit maps demonstrate a distinct stepwise organization in the order of best frequency progression. Furthermore, independent data from single neurons show that best frequencies at octave intervals of approximately one-third are more prevalent than others. These data suggest that, in the inferior colliculus, there is a defined space of tissue devoted to a given frequency, and input within this frequency band may be pooled for higher-level processing.
URI
ISSN
0270-6474
DOI
10.1523/JNEUROSCI.0238-08.2008
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