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Journal of Neuroscience, Vol 1, 40-48, Copyright © 1981 by Society for Neuroscience
Neuronal and behavioral sensitivity to binaural time differences in the owl
A Moiseff and M Konishi
We demonstrated that ongoing time disparity (OTD) was a sufficient cue for
the azimuthal component of receptive fields of auditory neurons in the owl
(Tyto alba) midbrain and that OTDs were sufficient to mediate meaningful
behavioral responses. We devised a technique which enabled us to change
easily between free field and dichotic stimuli while recording from single
auditory neurons in the owl mesencephalicus lateralis pars dorsalis (MLD).
MLD neurons with restricted spatial receptive fields ("space-mapped
neurons") showed marked sensitivity to specific ongoing time disparities.
The magnitudes of these disparities were in the behaviorally significant
range of tens of microseconds. The ongoing time disparities were correlated
significantly with the azimuthal center of receptor fields. Space-mapped
neurons were insensitive to transient disparities. MLD neurons which were
not space- mapped, i.e., were omnidirectional, did not show any sensitivity
to specific OTDs. We confirmed the behavioral relevance of OTD as a cue for
localizing a sound in azimuth by presenting OTD differences to tame owls.
Using head turning as an assay, we showed that OTD was a sufficient cue for
the azimuth of a sound. The relationship between azimuth and OTD obtained
from our neurophysiological experiments matched closely the relationship
obtained from our behavioral experiments.
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