Auditory Spatial Acuity in Barn Owls
Author Information
Author(s): Bala Avinash D. S., Spitzer Matthew W., Takahashi Terry T.
Primary Institution: Institute of Neuroscience, University of Oregon
Hypothesis
The acuity of the midbrain space map determines auditory spatial discrimination.
Conclusion
Barn owls have better auditory spatial discrimination in azimuth than in elevation, with a ratio of about 2.
Supporting Evidence
- The smallest discriminable change of source location was found to be about two times finer in azimuth than in elevation.
- Recordings from neurons in the midbrain space map revealed that their spatial tuning was also better in azimuth than in elevation by a factor of about two.
- The PDR behavioral assay is mediated by the same circuitry whether discrimination is assessed in azimuth or in elevation.
Takeaway
Barn owls can tell where sounds are coming from better side to side than up and down, like being able to see a friend across the playground but not being able to see them if they are on a swing.
Methodology
The study measured sound-source separation discrimination using the pupillary dilation response in barn owls.
Limitations
The study was limited to three barn owls, which may not represent the entire population.
Participant Demographics
Three barn owls (Tyto alba) were used in the study.
Statistical Information
P-Value
p<0.005
Statistical Significance
p<0.005
Digital Object Identifier (DOI)
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