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Neuronal and behavioral sensitivity to binaural time differences in the owl
Summary
Ongoing time disparity (OTD) guides auditory spatial mapping in owls. This neural cue, in the tens of microseconds, is sufficient for owls to determine sound source azimuth, as confirmed by behavioral head-turning responses.
Area of Science:
- Neuroscience
- Auditory Perception
- Animal Behavior
Background:
- Auditory neurons possess spatial receptive fields crucial for sound localization.
- Ongoing time disparity (OTD) is a potential cue for sound localization, but its sufficiency and neural basis require further investigation.
Purpose of the Study:
- To investigate the role of OTD in the azimuthal receptive fields of auditory neurons in the owl midbrain.
- To determine if OTD is sufficient to elicit behavioral responses for sound localization.
Main Methods:
- Recorded single auditory neuron activity in the owl mesencephalicus lateralis pars dorsalis (MLD) using a novel technique allowing seamless switching between free-field and dichotic stimuli.
- Presented controlled OTD differences to tame owls and measured head-turning responses as an assay for sound localization.
Main Results:
- MLD neurons with restricted spatial receptive fields (
Conclusions:
- OTD is a sufficient cue for the azimuthal component of auditory receptive fields in owl MLD neurons.
- OTD is behaviorally relevant and sufficient for owls to localize sound sources in azimuth.
- The neurophysiological findings on OTD-azimuth relationships closely matched behavioral observations.