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 Previous Article
Volume 17, Number 17,
Issue of September 1, 1997
pp. 6820-6837
Copyright ©1997 Society for Neuroscience
An Anatomical Basis for Visual Calibration of the Auditory Space
Map in the Barn Owl's Midbrain
Received Feb. 4, 1997; revised June 6, 1997; accepted June 20, 1997.
Daniel E. Feldman and
Eric I. Knudsen
Department of Neurobiology, Stanford University School of Medicine,
Stanford, California 94305-5401
The map of auditory space in the external nucleus of the inferior
colliculus (ICX) of the barn owl is calibrated by visual experience
during development. ICX neurons are tuned for interaural time
difference (ITD), the owl's primary cue for sound source azimuth, and
are arranged into a map of ITD. When vision is altered by rearing owls
with prismatic spectacles that shift the visual field in azimuth, ITD
tuning in the ICX shifts adaptively. In contrast, ITD tuning remains
unchanged in the lateral shell of the central nucleus of the inferior
colliculus (ICCls), which provides the principal auditory input to the
ICX, suggesting that the projection from the ICCls to the ICX is
altered by prism-rearing.
In this study, the topography of the ICCls-ICX projection was assessed
in normal and prism-reared owls by retrograde labeling using
biotinylated dextran amine. In juvenile owls at the age before prism
attachment, and in normal adults, labeling patterns were consistent
with a topographic projection, with each ICX site receiving input from
a restricted region of the ICCls with similar ITD tuning. In
prism-reared owls, labeling patterns were systematically altered: each
ICX site received additional, abnormal input from a region of the ICCls
where ITD tuning matched the shifted ITD tuning of the ICX neurons.
These results indicate that anatomical reorganization of the ICCls-ICX
projection contributes to the visual calibration of the ICX auditory
space map.
Key words:
sound localization;
inferior colliculus;
experience-dependent plasticity;
biotinylated dextran amine;
Tyto
alba;
development
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