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Journal of Neuroscience, Vol 2, 1177-1194, Copyright © 1982 by Society for Neuroscience
Auditory and visual maps of space in the optic tectum of the owl
EI Knudsen
The receptive field properties and functional organization of visual and
auditory responses were studied in the optic tectum of the barn owl (Tyto
alba). Most units throughout the depth of the tectum responded to both
visual and auditory stimuli. The entire visual field of each eye was
represented topographically in the contralateral tectum. In the portion of
the tectal map representing the zone of binocular vision, 50% of the
superficial layer units and 100% of the deep; layer units were driven
binocularly. The representation of the frontal binocular region of space
was greatly expanded in the map; the average magnification factor was 3
times greater for the frontal binocular zone than for the monocular zone.
The responses of the superficial and deep tectal units to auditory stimuli
were space specific; they responded only when a sound source was located in
a particular region of space, or receptive field, regardless of the
intensity or type of sound used. Most auditory receptive fields contained a
distinct "best area" where a sound source was most effective in driving the
unit. Auditory space, as defined by receptive fields and best areas, was
represented topographically in the tectum. The auditory and visual maps of
space had the same orientations, positions, magnification factors, and
termination coordinates at the anterior and dorsal edges of the tectum. Yet
the maps lost their registry near the posterior and ventral margins where
the most peripheral regions of space were represented. These
characteristics suggest that the spatiotopic organization in the tectum is
a compromise between a tendency for the space representations of different
modalities to align and for the representation of each modality to fill the
entire tectum.
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