@article{debello-and-knudsen-2004, abstract = {In the midbrain auditory localization pathway of the barn owl, a map of auditory space is relayed from the external nucleus of the inferior colliculus ({ICX}) to the deep and intermediate layers of the optic tectum ({OT}) and from these layers to the superficial layers. Within the {OT}, the auditory space map aligns with a visual map of space. Raising young barn owls with a prismatic displacement of the visual field leads to progressive changes in auditory tuning in the {OT} that tend to realign the auditory space map with the prismatically displaced visual space map. The only known site of this adaptive plasticity is in the {ICX}, in which the auditory system first creates a map of space. In this study, we identified an additional site of plasticity in the {OT}. In owls that experienced prisms beginning late in the juvenile period, adaptive shifts in auditory tuning in the superficial layers of the {OT} exceeded the adaptive shifts that occurred in the deep layers of the {OT} or in the {ICX}. Anatomical results from these owls demonstrated that the topography of intrinsic {OT} connections was systematically altered in the adaptive direction. In juvenile owls, plasticity in the {OT} increased as plasticity in the {ICX} decreased. Because plasticity at both sites has been shown to decline substantially in adults, these results suggest that an age-dependent decrease in auditory map plasticity occurs first in the {ICX} and later at the higher level, in the {OT}.}, author = {DeBello, William M. and Knudsen, Eric I.}, day = {04}, doi = {10.1523/jneurosci.0480-04.2004}, issn = {1529-2401}, journal = {The Journal of Neuroscience}, keywords = {auditory, auditory-processing, biology, ic, icx, ssl, topographic-maps}, month = aug, number = {31}, pages = {6853--6861}, pmid = {15295019}, posted-at = {2013-11-07 11:23:09}, priority = {2}, publisher = {Society for Neuroscience}, title = {Multiple Sites of Adaptive Plasticity in the Owl's Auditory Localization Pathway}, url = {http://dx.doi.org/10.1523/jneurosci.0480-04.2004}, volume = {24}, year = {2004} }
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ICx projects to intermediate and deep layers of SC.⇒
The shift in the auditory map in ICx comes with changed projections from ICc to ICx.⇒
There appears to be plasticity wrt. the auditory space map in the SC.⇒
The external nucleus of the inferior colliculus (ICx) of the barn owl represents a map of auditory space.⇒
The map of auditory space in the nucleus of the inferior colliculus (ICx) is calibrated by visual experience.⇒
The optic tectum (OT) receives information on sound source localization from ICx.⇒