Neural mechanisms of sound localization in an echolocating bat

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Science  17 Aug 1984:
Vol. 225, Issue 4663, pp. 725-728
DOI: 10.1126/science.6463649


The mustache bat emits a three-harmonic echolocation pulse. At the external ear, large interaural intensity differences are generated only when a sound originates within a limited area of two-dimensional space, and this area is different for each pulse harmonic. As a consequence, the external ear generates pronounced binaural spectral cues containing two-dimensional spatial information. This information is encoded in the inferior colliculus by neurons tuned to one of the harmonics and sensitive to interaural intensity differences.

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